That system was EFI (electronic fuel injection). The engine won't start because I am not getting any pulse to the injectors. No flashes from the injector circuit when cranking the engine would tell you the PCM is not pulsing the injectors. Due to these variables, GM does not publish any “engine running” fuel pressure specifications for this system. For command pulse width lower than 400 µs, the correlation becomes highly non-linear and, for some pulse durations, may also invert the. The 1990 Subaru Justy was the last car sold in the United States to have a carburetor; the following model year, the Justy had fuel injection. In turbocharged models (N54 engine), the fuel under system pressure is further pressurized by a mechanically driven pump to pressures as high as 200 bar (2,900 psi) before being routed to the fuel injectors (green arrow). So, Fuel injectors are now used in pretty much all passenger vehicles. sv650 clutch switch affect on fuel injector pulse width. The timing of opening the fuel injectors can involve all of them being open simultaneously or separately for each cylinder, in which they'll fire in a pre-determined sequence. The DME makes adjustments from base fuel trim using a 3D map. Injector drivers commonly use either the "saturated switch" or "peak-and-hold" designs. 00 minimum per injector. On a Mainline DynoLog Dyno the Injector Pulse Width is calculated from Injector Duty Cycle and Engine RPM. 13 Pulse width (Base pulse width) x (Factor A) x (Factor B) In order to calculate the pulse width, the ECU first looks up the base pulse width in a lookup table. MAF Operating Conditions. Winter 2002-2003. Larger Injectors The aftermarket performance industry rates the capacity of port fuel injectors on a scale based on how many pounds of fuel per hour (lb/hr) the injector can pass while the pintle. But most of all, to perform accurate fuel flow tests, using this injector pulser, and your fuel gauge. This is a typical high miles problem particularly with inadequate oil change intervals. Browse Category shopHemi. The normal pulse width is between 1 and 5 milliseconds: 1 millisecond indicates -40°C (-40°F), and 5 milliseconds indicates 125°C (257°F). The amount of fuel supplied depends on how long the fuel injector stays open. The results of this particular test, with injector No. 5 uL less fuel per injection event. This is done by cutting out one injector at a time and comparing the resulting injector pulse width with the no cut-out pulse width. a scan code reads; injector pulse width very high, 92MS. This is a typical high miles problem particularly with inadequate oil change intervals. · Available voltage at the pump under engine load and the pumps flow volume at that voltage. I have not heard of this problem occurring in Europe. I need to build a 12-15 volt driver for 8 injectors that can be energized at a variable speed (RPM) and for a variable pulse width (on-time). Check the manufacturer's pin data for the fuel injection Electronic Control Module (ECM) fuel injector connection terminal. One of the tricks that I discovered for fooling the stock ECU is to fit much larger injectors and tighten the tension on the AFM's spring. 42 Required; Usage Notes. Ce este Injector de combustibil Pulse Width? Toate motoarele auto moderne folosesc injectoare de combustibil pentru a furniza combustibil în camera de ardere. #2 dropped again today. #include "etpu_ToothGen_auto. 817 Maximum Fuel Consumption Per Cylinder (cc/minute) 152. The period of time is known as the injector “pulse width” and is measured in milliseconds. It's about the same pressure as common household water supply. We know that RPM / 2 = cycles per minute. We learn what the core injector data tables represent and how to properly program them. It states that an 800 us pulse is required to open the spool and another 800 us pulse is required to close it. In most diesel applications, the exhaust gas recirculation valve is PWM controlled also. The module increases the injector pulse width (or length of time the injector sprays) based on fuel pressure change in the fuel rail. Fuel Injector Pulse Tester. I have checked the fuses for the EEC and I know I am getting fuel all the way up to the injectors and the fuel pump is working. The selectable peak and hold currents allow for the user to select the most ideal setting based on the battery voltage, fuel pressure and specific injector used. It's no secret -- your car needs fuel. 7 to 1 Air to Fuel ratio). “Simply put, Duty Cycle is just a measurement of how long an injector stays opened, to supply the required volume of fuel to an engine, in comparison to the total amount of time available for that event to happen. All of which have a direct affect on fuel injector pulse width, (the time the injectors are open), which directly affects fuel pressure. The DME makes adjustments from base fuel trim using a 3D map. Before I replaced the front section of the fuel line it would actually fire up and die immediately because the line kept popping off the rail because the quick disconnect was messed up. Fuel trim is the correction for air seen by the feedback system in the engine. 5psi at 90-degree Fahrenheit fuel temperature using CF-16B calibration fluid. Injector Pulse. Fuel Injector Pulse Width Dead Zone We are trying to determine if we ever operate in the non-linear pulse width zone of our fuel injectors. 6 ms plus the time that the injector is injecting. Pulse Repetition Interval (PRI) is the time between sequential pulses. 2° of the NO CUTOUT PULSE WIDTH, by comparing the CUTOUT PULSE WIDTH values to the NO CUTOUT PULSE WIDTH values. -I have a jumper harness to bypass the haltech ecu when i need to get an inspection (plus swap injectors). Fuel Injector Problems Defective Pink Fuel Injector. 00 mm Connector lole Orifice) USCAR Linearity E 40 Basic Dimensions Bod Fuel Inlet Cup Diameter 13. This is why the Tuning Module is fuel efficient. Just remember, when that injector "opens", it "sees" the manifold pressure. The only performance EFI system for Harley-Davidson V-Twin motorcycles designed from the ground up to maximize your engines performance. Every injector has a point in its operation at low pulse widths that will start to make the fuel flow coming out of the injector nonlinear. It does not have injector pulse. Just remember, when that injector "opens", it "sees" the manifold pressure. Features:. Fuel Injector timing and injector pulse width are controlled by the PCM. The Fuel Control Actuator solenoid valve is a pulse-width modulated valve that controls the amount of fuel sent or delayed to the high-pressure pump elements inside the high-pressure pump. 1-second cycle, the fuel injector duty cycle equals 50%. The Power Probe IV can measure frequencies from 1Hz to 9999Hz. I'm not sure what the "Temperature Sensors" output does, and the "Internal RPM / Points Test" outputs are for the trigger contact simulator outputs. The amount of fuel supplied depends on how long the fuel injector stays open. making a novel low cost high frequency fuel injection system that is specifically designed for the small engine market. All units are flow tested and balanced and replaced with new O-rings and gaskets. 001msec to the injection pulse time (ti) in order to maintain a Lambda = 1 (14. 2 milliseconds for idle. What do you know regarding gasoline fuel systems, and do you think you know enough to pass this quiz? The fuel system is critical in storing and delivering the gasoline or diesel fuel, which helps the engine to run. A value of 100% means no change to the pulse width. To find suspect injectors, look for a cylinder with a value that is within 0. Remember also that injectors have a "dead time" of about 0. This is achieved through pulse-width modulation (PWM). -Where we run into problems with our type of system is that it is unable to increase the injector pulse width enough to offset the differences in a compromised fuel injector. Similar Threads - Fitech Pulse Width Forum Date; Supercharging With Fitech Fuel Delivery Problems: General Supercharger Discussion: Sep 1, 2019: Fitech Fuel Injection: General Supercharger Discussion: Apr 10, 2016. HP x BSFC) / (number of injectors x duty cycle). 3L, runs better than ever!! THANKS FOR ALL THE INPUT. Example of duty cycle. The amount of fuel injected is varied by changing the time the injector is open by means of the injector pulse width. Due to these variables, GM does not publish any “engine running” fuel pressure specifications for this system. 0 ms or lower to correct for a hot-idle, excess fuel condition. FIVEOMOTORSPORT, INC. 300 rpm is good for most automotive engines, but a higher value may be needed for motorcycle engine or other specialized uses. (Limp Home Mode) The injection pulse width is a product of the TPS, MAF, MAP, CAS and MAT sensors. Depending on engine operating conditions, the fuel injection pressure varies between approximately. The duration that the valve is open- and consequently the amount of fuel sent into the cylinder- depends on the pulse width (i. One method to accomplish this is called the pulse width modulated (PWM) circuit. I'm not sure what the "Temperature Sensors" output does, and the "Internal RPM / Points Test" outputs are for the trigger contact simulator outputs. Why? Because all coils pulse width ranges between 0. -The stock ecu controls everything else. 2 degrees of the NO CUTOUT PULSE WIDTH, by comparing the CUTOUT PULSE WIDTH values to the NO CUTOUT PULSE WIDTH values. Use external high flow pump for all kinds of flow demand for injector test. Do not forget to check the fuel filter; many times it is forgotten. V PWR--Battery Voltage--RPM--CaMshaft Position sensor--ICP--Injection Control Pressure--FuelPW--Fuel Pulse Width: When starting V PWR should be above 10volts, ICP should be at least 500psi, at least 100RPM, and FuelPW 1mS-6mS. MotoHawk_lib/Advanced Digital I/O Description. It can also control coil Dwell or Pulse-Width and will go between 0. 1mS increments) Adjustable Operating Time (in 5 second increments) Injector Pulses Volumetric Cylinder Capacity ml/cc Input Power (Volts)/Power Consumption (Watts) Operating Frequency (Hz) Test Fluid Ultrasonic Cleaning Fluid Injector Components. Many military aircraft engines of the 1940s utilized a pressure carburetor , a type of fuel metering system similar to a throttle body injection system. This is a typical high miles problem particularly with inadequate oil change intervals. More fuel was needed to feed the supercharger, so larger fuel injectors rated at 600 cc/min are utilized. It must have gotten stuck or something. if you have to go up i think i'd only go up to 21#. Developed to perform fuel injector flow testing, injector cleaning and pulse width general injector health determination, like pintle opening, binding and weak springs. Pulse width is a term to describe how much average voltage is applied to an injector coil over a given time span - typically about 2. Fuel injection has enough variables to deal with and the correct method is to keep fuel pressure constant relative to manifold pressure. making a novel low cost high frequency fuel injection system that is specifically designed for the small engine market. Two fuel rail pressure regulators (FRPR) are used on the 2010 DMAX. No pulse at all from either injector? This thing ran when I parked it to work on it. Now that we know the maximum amount of fuel we can get from our injector in one minute, we can move forward. CARDONE Remanufactured Fuel Injectors provide an alternative plug and play solution to fuel delivery for diesel applications. Fuel pressure and leak-down must be tested with the engine off. It should be roughly 0. The scooters on-board computer and wiring harness remain intact, with no wires needing to be cut. Fuel injector Sizing Program by Bowling This program allows you to determine the correct fuel injectors to use based on a few engine parameters. Reman Fuel Injectors (188) Reman Fuel Transfer Pumps (36) Reman Injector Nozzles (61) The results are maximum productivity and lower costs. E85 Compatible. Think of fuel injectors as simple electronic valves that are under a high pressure fuel rail. Note that for engines with different firing orders, you do NOT change these pins. Furthermore, New technology has made fuel injectors more precise than ever in dispensing fuel. Delphi Multec® GDi Multi-Hole Fuel Injectors Targeted Performance Specifications Static flow rate Closing response time Opening response time Fuel pressure Qmin flow at 100 bar, 7. 3 Powerstroke Injectors. The MEFI-4 ECM reads the TPS voltage every few milliseconds and calculates the difference between the current and last readings. 2 degrees of the NO CUTOUT PULSE WIDTH, by comparing the CUTOUT PULSE WIDTH values to the NO CUTOUT PULSE WIDTH values. 3 gm/pulse - 2. Predicted dynamic flow and static flow rates show higher values at a temperature of 80°C, which are consistent with the test results. Pulse width : 0-30 ms, step: 0 500 to 7000RPM• Selection of injection time : 1ms. 7, I have good fuel pressure and good spark but I am only getting 0. A second regulator is located on the front of the left fuel rail and has a normally open solenoid. Due to these variables, GM does not publish any “engine running” fuel pressure specifications for this system. PROGRAMMED FUEL INJECTION SYSTEM DIAGRAM Programmed fuel injection provides each cylinder with a precise amount of fuel to mix with the incoming air. 3°CA, which was modelled to be equivalent to up to 3% worse brake thermal efficiency, (if only AI50 had changed). The electronic control unit is used to estimate the pulse width of the signal that would actuate the fuel injector and the start of fuel injection. The 1990 Subaru Justy was the last car sold in the United States to have a carburetor; the following model year, the Justy had fuel injection. Fuel Injector 5 Circuit/Open Description: The Fuel Injectors are supplied voltage from the Automatic Shut Down (ASD) Relay Output circuit. Problem #3 – Foreign Object Inside Injector. If this is good, then the issue is a bad ECM. Width (mm) Height (mm) Curb weight (kg) Gross weight (kg) Load (kg) Stützlast (kg) Roof load (kg) Cargo space (litres) Tow weight (kg) Gas tank (litres) 0-100 kmph (sec) Max speed (km/h) Fuel eff (l/100km) Fuel eff city (l/100km) Fuel eff highway (l/100km) Engine type Fuel type CO2 (g/km) CO2 efficiency class Pollution class Price; Image: Make. If the cam sensor goes faulty, the engine will go into grouped or continuous injection as a limited operation strategy. The "Injection Duration" plug outputs a cleaned-up injection waveform that is easily read on a scope or can be connected to a DMM with pulse width measurement capabilities. -The haltech controls fuel, ignition, and tach w/ independent intake temp and coolant temp sensors. The normal pulse width is between 1 and 5 milliseconds: 1 millisecond indicates -40°C (-40°F), and 5 milliseconds indicates 125°C (257°F). From injector b. Turns over but won’t start. making a novel low cost high frequency fuel injection system that is specifically designed for the small engine market. That's pretty darn close to ground so if I take cursor one and put it there, and cursor two and put it at the end of that ground period, that's going to give us our injector pulse width; 2. Performance Fuel Injection Upgrade your carburetor to Fuel Injection for maximum performance MAD-EFI. If the injectors appear to be working, but the engine will not start, the engine may be flooded. Various fuel injector harnesses plug into this connector. Similar Threads - Fitech Pulse Width Forum Date; Supercharging With Fitech Fuel Delivery Problems: General Supercharger Discussion: Sep 1, 2019: Fitech Fuel Injection: General Supercharger Discussion: Apr 10, 2016. Perform the following to determine if the fuel injector repair resolved excessive white smoke:‪ Start and run the engine. 630cc for up to 420bhp. The period of time is known as the injector “pulse width” and is measured in milliseconds. Fuel Injector Specs IWP048 Fuel injector 5 hole – Cone spray, fuel injector Description This IWP048 “Pico" top feed injector is a production component with a multi hole ‘cone’ spray pattern and a wide range of applications for engines typically up to 30bhp per cylinder (depending on injection pressure). Replace the stock fuel injectors for your modified HEMI engine with High performance injectors designed for 700 HP and up. Need to Log Fuel Injector pulse width for my 2014 Challenger R/T. The basic formula is 1 / RPM / 60 = "cycle time" in seconds. I need to build a 12-15 volt driver for 8 injectors that can be energized at a variable speed (RPM) and for a variable pulse width (on-time). By precisely measuring the change in speed of the compression stroke of each individual cylinder, the PowerControl is able to make real time injection changes, which results in higher torque and power figures. This is a typical high miles problem particularly with inadequate oil change intervals. Fuel Injector timing and injector pulse width are controlled by the PCM. In practice, the increase in injector pulse width is achieved by pressing harder on the engine accelerator pedal. Gauge package displays engine temp, injector pulse width, mixture knob position, and battery voltage in real time. It should be roughly 0. HP x BSFC) / (number of injectors x duty cycle). 9 dP/dt [MPa/ms] FP-213 Assembly Temperature correction coefficient of fuel is obtained in real time. calculation of the fuel injector pulse width. Pulse-Width Modulation. But fuel injection has been around since the 1950s, and electronic fuel injection was used widely on European cars starting around 1980. 5ul amounts to a mere 0. If the valve is pulsed ON at variable durations (called pulse-width modulation), the duty cycle varies. This test is fast, easy, safe and I have found it to be very reliable. New wires, plugs, cap, rotor, fuel filter,etc have spark, have fuel at the back of the tbi. Fuel Injector Pulse Width Monitor- Shown below is the schematic for the pulse width monitor. Good shape. · Maximum fuel system pressure and the pumps flow volume at that pressure. 5 PSI fuel pressure) FIC Fuel Injector Clinic Injector Set of 6660cc (62 lbs/hr at 43. The sensor in the distributor is the camshaft position sensor and it has nothing to do with fuel injector pulse width, or ignition spark. There is absolutly no gain in power by adding larger injectors if the stock injectors will flow enough fuel at 80% duty cycle. For command pulse width lower than 400 µs, the correlation becomes highly non-linear and, for some pulse durations, may also invert the. A fuel accumulator is used to dampen the hydraulic pulses in the system created when all the injectors open simultaneously. h" #include "etpuc_EngineSystem. Fuel Pressure is critical to the operation of a fuel injection system. Not every change in fuel pressure triggers an increase of the injector pulse width and the addition of fuel. 5 quarts 6 quarts. This is not a 'peak. Developed to perform fuel injector flow testing, injector cleaning and pulse width general injector health determination, like pintle opening, binding and weak springs. MSD Ignition Atomic EFI Master Kit Max 525 HP. Fuel pressure and leak-down must be tested with the engine off. Since 1986, Marren Fuel Injection has been focused on developing products and services that improve the performance and overall experience for anything EFI equipped. When you first start a typical engine, the pulse width is around 4 milliseconds but as soon as the engine "catches" the pulse width is shortened to about 2. To properly evaluate a fuel pressure regulator would require hooking up a fuel pressure gauge and observing the pressure with the vacuum line connected and disconnected. Now that we know the maximum amount of fuel we can get from our injector in one minute, we can move forward. Running several buzz tests cold will sometimes free up the injectors. These fuel injectors can be purchased for as little as $35. Injector Voltage Correction 100% The percentage the the injector pulse width is varied with changes in supply voltage. calculation of the fuel injector pulse width. Base pulse width is a. I order fuel injectors for the 1989 model year for all 1985-1988 cars because they will be Multec style and have the same resistance. Fuel injectors are used in the automotive industry and aerospace industry to control the volume of fuel injected into an engine’s combustion chamber. I have a small 1986 Toyota Dolfin motorhome on the pickup frame and with the everlasting 4 cyl 22R engine with fuel injection. Due to high negative fuel trims, a leaking fuel injector will reduce average fuel injector pulse widths from about 2-3 milliseconds (ms) to 1. This limits the minimum pulse width that the ECU is allowed to use. Every injector has a point in its operation at low pulse widths that will start to make the fuel flow coming out of the injector nonlinear. the injector pulse width, and a negative long term fuel trim is indicated. This is typically between 0. This is called the ‘pulse width’. 2 and 10ms, which can make spray droplet size measurements challenging. Another basic issue: recent factory fuel injection systems are called sequential, because each injector is pulsed individually at the optimum time. The injectors operate linearly with pulse width as small as 1. 817 Maximum Fuel Consumption Per Cylinder (cc/minute) 152. 5 Top Feed Fuel Injector Application Manual Release/Revision Summary Sheet CHANGE NO. Fuel rail pressures stay about the same - injector duration is varied for operating conditions. The axis are usually RPM, Injector pulse width and load. The fuel is under enough pressure to penetrate your skin. Fuel pressure should be a constant 10 – 15 PSI on a TBI fuel injection system and is typically around 12 – 13 psi. The ECM meters the fuel output of the injectors using pulse width signals. MY CART Minimum Pulse Width: 1. It is essential these harnesses are used so that injector firing sequence is maintained. Browse Category shopHemi. On a Mainline DynoLog Dyno the Injector Pulse Width is calculated from Injector Duty Cycle and Engine RPM. This results in maximum fuel economy and performance because each cylinder is given only the fuel it needs. There is absolutly no gain in power by adding larger injectors if the stock injectors will flow enough fuel at 80% duty cycle. Now, all cars sold in the United States have fuel injection systems. The strategy followed was to modify the Injector Pulse Width, a Pulse Width Modulated (PWM) control signal generated by the ECU to regulate the fuel release of fuel injectors, based on an analysis done regarding the emissions containing in exhaust gas. 4 msec 30 to 260 bar 5. When LTFT exceeds 10%, the PCM is likely compensating for a faulty component, something beyond normal engine wear. The command center supplies the throttle with 58 psi high-pressure fuel at the rate of 340 Iph. 4 ohm: Click the button below to add the DEATSCHWERKS 17U-05-0095-8 95# FUEL INJECTORS. The fuel injectors vary according to the pulse duration and duty cycle. The axis are usually RPM, Injector pulse width and load. It has fuel and it has spark. At a pulse width of 19msec, which equals 90% duty cycle at 6,000 rpm, 2. The IDM sends a 110 volt pulse-width modulated signal to the injector solenoid. IPW abbreviation stands for Injector Pulse Width. 1-second cycle, the fuel injector duty cycle equals 50%. There's a point in the fuel delivery curve (the breakpoint) where the slope changes. 4 ms (400 μs). As a result, the injectors are not compatible with US fuel. The longer the pulse width, the more fuel is injected. Checking Injector On-Time With Built-In Function Several DVOMs have a feature that allows them to measure injector on-time (mS pulse width). At 100% duty cycle, the injector would be on constantly. Note that for engines with different firing orders, you do NOT change these pins. Developed to perform fuel injector flow testing, injector cleaning, and pulse width, general injector health determination. Many earlier systems from the 1980s and early 1990s fired the injectors in groups - so called batch fired. Remember this and do not get confused. 2 milliseconds and opens with the standard 4 amp peak and 1 amp hold ECU drivers. Ecu Flash Training Course Part 6: Fuel Injector Data & Programming goes through how the fuel mass calculation gets turned into a fuel injector pulse-width to deliver the precise amount of fuel needed during the engine's operation. As stated, maximum injector pulse width is dependent on the RPM of the motor. Tagged bad tuning, corsa, injectors, piston 4, remap. injectors, the correlation between the pulse command duration and the injected fuel amount appears linear and repetitive for pulse durations greater than 400 µs and for injected fuel greater than 2. This measurement is taken with the injector on 100% of the time (100% duty cycle, or wide open) and with the fuel at a given pressure (usually 43. The first remains located on the injection pump. I have checked the fuses for the EEC and I know I am getting fuel all the way up to the injectors and the fuel pump is working. Most companies flow match their nozzles either at wide open or 4,000 rpms. 4Liter Powerstroke • Power Level 1 - 25 HP & 55 lb-ft. Fuel Injector Reference 1. Plus the M. Drop in plug fitment! Click Here For Plug and Play Ford ECU Data Choose From:540cc (52 lbs/hr at 43. I don't think it's an injector because #2 was dropping before Saturday, we swapped #2 and #1 injectors. It is also less costly per-gallon than high-octane racing gasoline. The fuel injector gets a pulsed signal for a given duration and the pressure drop is noted. RPM: This is the rpm at which your MicroSquirt® controller switches from the cranking pulse width injected at every ignition event to the pulse width calculated from the fueling equations (MAP, IAT, RPM, etc. EDIT: Voltage at injectors are good, but the ECU is. The slope of both lines is the same, as they have the same flow rate, but the difference in offset results in the injector with the higher offset delivering 2. It's no secret -- your car needs fuel. The PCM routes the alternator field winding, fuel injectors, coil(s), some relays and some sensors through the “power ground” circuits. The longer the “pulse”, the more fuel the injector sprays. 634 Cylinders: 2 Maximum Fuel Consumption Per Cylinder (lb/hour) 14. Remember also that injectors have a "dead time" of about 0. This is done to LEAN out the fuel mixture to compensate for what it perceives as a rich running condition. An injector is by far the most likely cause, followed by the injector wiring harness. A fuel pressure regulator maintains 28-36 psi (193-248 kPa), (28-50 psi 193-345 kPa on turbocharged engines) in the fuel line to the injectors and the excess fuel is fed back to the tank. com website) 14869 Yellow Water Lane Jacksonville, FL 32234 call us at 904-289-2020 or e-mail [email protected] All fuel injectors have separate grounds at the ECM. This allows for some future horsepower increases. Fuel injection has enough variables to deal with and the correct method is to keep fuel pressure constant relative to manifold pressure. Fuel Injector Clinic injectors are flow tested and rated at 43. 5psi at 90-degree Fahrenheit fuel temperature using CF-16B calibration fluid. Injector Driver Basic Function:. It has fuel and it has spark. See all 41 photos We chose to make our own sensor mount using a piece of fuel. Depending on the system design, the timing of when injector opens is either relative each individual cylinder (for a sequential fuel injection (SFI) system), or injectors for multiple cylinders may be signalled to open at the same. The longer the pulse width, the greater the volume of fuel delivered and the richer the mixture. It should be roughly 0. The module increases the injector pulse width (or length of time the injector sprays) based on fuel pressure change in the fuel rail. 0 239-4907: INJECTOR GP- Check Price. The spark plug with the most soot indicates the cylinder. 00 800 1002 12. 7 fuel injector. If the cam sensor goes faulty, the engine will go into grouped or continuous injection as a limited operation strategy. The PCM uses the FRP signal to command the correct injector timing and pulse width for correct fuel delivery at all speed and load conditions. An injector that doesn’t open can cause hard starts, lack of power and the rough running condition. The amount of fuel is controlled by the valve opening time. The stock air-fuel Map remains intact, as. If the valve is pulsed ON at variable durations (called pulse-width modulation), the duty cycle varies. I'm a master technician, I understand pulse width but thanks for the explanation. I also mentioned fuel injector problems. You can click and drag to highlight an area of cells. We know that RPM / 2 = cycles per minute. N-Heptane: 12. Developed to perform fuel injector flow testing, injector cleaning, and pulse width, general injector health determination. Fuel Injector Reference 1. Note that for engines with different firing orders, you do NOT change these pins. The GM ECU-specific short pulse width compensation and minimum IPW data for Fuel Injector Clinic’s 2,150 cc/min injector, formatted for HP Tuners. It should be roughly 0. The ECU has sensors to monitor the air entering the engine and the oxygen in the exhaust to fine tune the fuel delivery. The PCM continues to control spark timing by switching the on-and-off grounding to the coil(s). In the D-Jetronic system, the manifold pressure sensor senses the intake manifold vacuum, and engine speed is sensed by the trigger contact points in the. So maximum fuel flow will then be limited by the size of the. I can't even guess what that time may be. If a large enough change is detected, adjustments are then made to the fuel injector’s base pulse width value to provide extra fuel for rapid acceleration or decrease in fuel for deceleration. Pulse Count Injection (PCI) [1, 2] is a new and novel low cost high frequency fuel injection system designed specifically for the small engine market (both 2 and 4 stroke engines). The fuel injector driver plays an important part in the PCM or EFI (electronic fuel injection) controller (if applicable). That said, fuel usage increases 30-35% to support equal HP, somewhat offsetting the lower cost and requiring the HP rating of all fuel system components, including and especially the HP ratings of the fuel pump and fuel injectors, be reduced by 30-35%. It should be roughly 0. The selectable peak and hold currents allow for the user to select the most ideal setting based on the battery voltage, fuel pressure and specific injector used. Pulse width : 0-30 ms, step: 0 500 to 7000RPM• Selection of injection time : 1ms. MotoHawk_lib/Advanced Digital I/O Description. Using the 1141 or 1142 from the previous post, how do I create a pid incorporating this information. Diesel Injector Fuel Distribution and Design. h" #ifndef _ASH_WARE_SCRIPT_ #include "ETpuLib. Diesel fuel distribution and the design of the injector is critical to maximum fuel economy and minimum emissions. An injector is by far the most likely cause, followed by the injector wiring harness. injector usage by providing more fuel into the combustion chamber, limitations of fuel injector size and type can still limit the flow. I also mentioned fuel injector problems. Fuel Injector Pulse Width Dead Zone We are trying to determine if we ever operate in the non-linear pulse width zone of our fuel injectors. The normal pulse width is between 1 and 5 milliseconds: 1 millisecond indicates -40°C (-40°F), and 5 milliseconds indicates 125°C (257°F). Similar Threads - Fitech Pulse Width Forum Date; Supercharging With Fitech Fuel Delivery Problems: General Supercharger Discussion: Sep 1, 2019: Fitech Fuel Injection: General Supercharger Discussion: Apr 10, 2016. 5 milliseconds for EFI cars. Fuel Pressure is critical to the operation of a fuel injection system. It has fuel and it has spark. Injectors! Navistar is now using a Siemens HEUI for their DT466/DT530 applications. · Available voltage at the pump under engine load and the pumps flow volume at that voltage. A bad fuel injector can cause your 3. PROGRAMMED FUEL INJECTION SYSTEM DIAGRAM Programmed fuel injection provides each cylinder with a precise amount of fuel to mix with the incoming air. The ECM controls the injectors that are located in the fuel meter body assembly of the TBI. The fuel injector drives will max out at 5 amps each, enough to drive one low-impedance (or 4 high-impedance) injector per bank. 5ms pulse width and 10ms repetition rate @ 58. Sometimes a few may have a different delivery rate which can be a great aid in troubleshooting a poor running engine. 5psi at 90-degree Fahrenheit fuel temperature using CF-16B calibration fluid. Just remember, when that injector "opens", it "sees" the manifold pressure. An injector that doesn’t open can cause hard starts, lack of power and the rough running condition. 0 mg/pulse 7 µm. A pulse width modulated is applied to this regulator to control the amount of fuel returned to the fuel tank. By precisely measuring the change in speed of the compression stroke of each individual cylinder, the PowerControl is able to make real time injection changes, which results in higher torque and power figures. The air flow meter, air intake temperature sensor, engine temperature sensor, barometric pressure and other sensors provide data the PCM uses to calculate injector pulse width. By precisely measuring the change in speed of the compression stroke of each individual cylinder, the PowerControl is able to make real time injection changes, which results in higher torque and power figures. (9 to 13psi. The strategy followed was to modify the Injector Pulse Width, a Pulse Width Modulated (PWM) control signal generated by the ECU to regulate the fuel release of fuel injectors, based on an analysis done regarding the emissions containing in exhaust gas. 09 seconds of that same 0. Apply to all low resistance or high resistance injectors (12V). Use the Maps pull down to access the fuel map tables. The 1990 Subaru Justy was the last car sold in the United States to have a carburetor; the following model year, the Justy had fuel injection. Pulse-Width Modulation. Key ON, engine OFF, fuel pump running: fuel pressure must be 60psi to 66psi and must remain above 55psi for 3 to 5 minutes after the fuel pump shuts off. N-Heptane: 12. Step 4: Calculate Your Optimum Injector Size Armed with the information from steps one through three above, you can now calculate the optimum fuel injector size using the following formula: injector size in lbs. I am having a misfire in cylinder no. Fuel Injector Specs IWP048 Fuel injector 5 hole – Cone spray, fuel injector Description This IWP048 “Pico" top feed injector is a production component with a multi hole ‘cone’ spray pattern and a wide range of applications for engines typically up to 30bhp per cylinder (depending on injection pressure). We have analysed how the. A fuel pressure regulator maintains 28-36 psi (193-248 kPa), (28-50 psi 193-345 kPa on turbocharged engines) in the fuel line to the injectors and the excess fuel is fed back to the tank. The module increases the injector pulse width (or length of time the injector sprays) based on fuel pressure change in the fuel rail. The ECM determines the fuel pressure set point based on engine sensor and rail-pressure inputs. This test is fast, easy, safe and I have found it to be very reliable. 2° of the NO CUTOUT PULSE WIDTH, by comparing the CUTOUT PULSE WIDTH values to the NO CUTOUT PULSE WIDTH values. Most other systems are called “post-fuel devices” and are basically signal modifiers that adjust spark and/or fuel injector pulse widths. As the computer determines that a cylinder should fire it signals the Injector Driver Module. The command center supplies the throttle with 58 psi high-pressure fuel at the rate of 340 Iph. Perform the following to determine if the fuel injector repair resolved excessive white smoke:‪ Start and run the engine. This corresponds to a LTFT of 1. possessing a carburetor was in the year _____. With a pressure capability of 9 bar this injector can flow as much as 3700cc/min with excellent low pulse width linearity, and has the broadest operating range of any injector on the market. This test requires high speed synchronous analog measurement inputs to record up to 9 injection cycles per stroke with an approx. Also known as the injector pulse width. To properly evaluate a fuel pressure regulator would require hooking up a fuel pressure gauge and observing the pressure with the vacuum line connected and disconnected. For command pulse width lower than 400 µs, the correlation becomes highly non-linear and, for some pulse durations, may also invert the. Now they all vary, but the basic idea is that you try and size the injector for about 80-85% duty at full engine power(ie ratio of actual pulse width to available pulse width). That said, fuel usage increases 30-35% to support equal HP, somewhat offsetting the lower cost and requiring the HP rating of all fuel system components, including and especially the HP ratings of the fuel pump and fuel injectors, be reduced by 30-35%. Gasoline Direct Injection (GDI) is the latest form of fuel injection. Replaced the line and now it holds fine but the injectors aren't pulsing. Reman Fuel Injectors (188) Reman Fuel Transfer Pumps (36) Reman Injector Nozzles (61) The results are maximum productivity and lower costs. 02 SENSORS & FUEL INJECTORS (This is an internal page of the JAGUAR FUEL INJECTOR SERVICE. Fuel injectors are used in the automotive industry and aerospace industry to control the volume of fuel injected into an engine’s combustion chamber. Areas of interest where. Minimum Linear Pulse Width: 1. The signals are based on manifold pressure, charge air temperature, gas pressure, gas temperature, and fuel mapping, providing the best combination of high efficiency and low emissions. Injectors are switched on and off by the ECU, and are controlled using a technique called Pulse Width Modulation. With today's fuel injectors costing from 40 - 80 dollars each, the cost of the tester and connector easily pays for itself with just one injector flushing. But most of all, to perform accurate fuel flow tests, using this injector pulser, and your fuel gauge. Fuel Injector, Rebuilt, 1975-79 Beetle and Super Beetle, 0-280-150-112 are the finest rebuilt fuel injectors we have found anywhere. Since 1986, Marren Fuel Injection has been focused on developing products and services that improve the performance and overall experience for anything EFI equipped. 1 unplugged the LTFT change is approximately +14%, injector 2 +10%, injector 3 +17% and injector 4 +16%. That's pretty darn close to ground so if I take cursor one and put it there, and cursor two and put it at the end of that ground period, that's going to give us our injector pulse width; 2. PCM open loop adjustments of the injector pulse width/flow will meet the wide open throttle demand. If any CUTOUT PULSE WIDTH values are within 0. Antonyms for injector. h" #include "etpu_FuelDriver_auto. The Power Probe IV can measure frequencies from 1Hz to 9999Hz. As the computer determines that a cylinder should fire it signals the Injector Driver Module. TECH, 87 S10 no injector pulse while cranking, but starts w/starting fluid Discussion in ' The BS Topic ' started by TRQJNKY , Oct 18, 2010. To get everything to fit without lots of heat sinking, MicroSquirt® uses the ST VND5N07 from STMicroelectronics to drive the injectors. 44 mm Characteristic Injector Flow Curve Fi114991 80 lb/hr Deka IV Lonq USCar Features. Poor power - caused by mismatched injector fuel delivery. Everyone knows that you put fuel into the tank to keep the car running. Before setting out to modify the fuel injector engine, you need to know the basics, so that you can make the right choice. It does not have injector pulse. PCM open loop adjustments of the injector pulse width/flow will meet the wide open throttle demand. Original AUTOOL CT150 Car Fuel Injector Tester Cleaning Machine Ultrasound Cleaning Injectors Fuel Nozzles Tester 220V 110V Item Width: 40cm; PWM Pulse: 0~20. The fuel injector is an electrically-controlled solenoid that allows pulses of fuel to be injected into the inlet ports. Fuel Injector Pulse Width Monitor- Shown below is the schematic for the pulse width monitor. Each time we open the throttle, the PCM increases the fuel injector's pulse width to keep fuel/air mixture correct. 2 Test the Engine with Repaired Fuel Injector. Remember also that injectors have a "dead time" of about 0. Basically what i am building is a supplementary fuel system that will be triggered when the engine goes into boost, so when the MAP sensor reads 2. Observed pulse width and noticed all values were about the same until operating temp then cyl 1,3,5 stayed around 2400 and cyl 2,4,6 dropped down to around 1800. Predicted dynamic flow and static flow rates show higher values at a temperature of 80°C, which are consistent with the test results. FIVEOMOTORSPORT, INC. Current flow through the winding will result in the creation of a large magnetic field, which has the effect of “attracting” the pintle valve into the winding. A typical pulse width is 2 to 4 milliseconds at idle and as high as 15 to 18 milliseconds at wide open throttle. The fuel injector drives will max out at 5 amps each, enough to drive one low-impedance (or 4 high-impedance) injector per bank. There's a point in the fuel delivery curve (the breakpoint) where the slope changes. Once the water warms past 120 degrees or so, the computer does not need to add any extra fuel. Fuel is supplied to the injectors through fuel rails inside the cylinder heads. If it pulsed ON for 0. 02245 Maximum Fuel Consumption (g/hour) 13470 Maximum Fuel Consumption (lb/hour) 29. MotoHawk_lib/Advanced Digital I/O Description. This is done by cutting out one injector at a time and comparing the resulting injector pulse width with the no cut-out pulse width. Steps to check the injector coil. 1 compatible. Some Assembly Required. It varies the pulse width based on input signals. This is why the Tuning Module is fuel efficient. When an injector is open 100% of that time, the injector is in what is called a static condition. The basic formula is 1 / RPM / 60 = "cycle time" in seconds. I've had the same problem for a while now. Test and clean MPI, SPFI, TBI, CFI, Motorbike-injector, LPG, K-jet, L-jet etc. 5 ms and the temperature of 20–100°C were used to study the pintle injector performance. The strategy followed was to modify the Injector Pulse Width, a Pulse Width Modulated (PWM) control signal generated by the ECU to regulate the fuel release of fuel injectors, based on an analysis done regarding the emissions containing in exhaust gas. The MEFI-4 ECM reads the TPS voltage every few milliseconds and calculates the difference between the current and last readings. This has the effect of allowing you to deliver more fuel in less time, at greater boost, without. Injectors! Navistar is now using a Siemens HEUI for their DT466/DT530 applications. The IDM sends a 110 volt pulse-width modulated signal to the injector solenoid. The ECM controls the injectors that are located in the fuel meter body assembly of the TBI. But most of all, to perform accurate fuel flow tests, using this injector pulser, and your fuel gauge. All fuel pulses are modified in real-time by the Engine Control Unit for optimum performance of the engine. h" #ifndef _ASH_WARE_SCRIPT_ #include "ETpuLib. When more air was given by the driver when the accelerator was depressed, the Jetronic system answered by keeping the injectors open a bit longer by lengthening the pulse-width of the ground signal to the injector and thus obtaining the perfect mix (14. 45 m 2 Heat dissipation amount: 11. The process is repeated with the remaining injectors for comparison. Using the 1141 or 1142 from the previous post, how do I create a pid incorporating this information. 5 ms About 0. You don't have to panic. Another basic issue: recent factory fuel injection systems are called sequential, because each injector is pulsed individually at the optimum time. If a large enough change is detected, adjustments are then made to the fuel injector’s base pulse width value to provide extra fuel for rapid acceleration or decrease in fuel for deceleration. However the injection pulse width nees to be corrected as alcohol and unleaded have very different A/F ratios. h" #include "etpu_SparkDriver_auto. The only source you need for professional ultrasonic fuel injector cleaning, testing and service. So if you plan on upgrading in the near future, you would do well to pull out a piece of paper and a calculator to figure out exactly how big you can go before exceeding your nominal idle characteristics. But fuel injection has been around since the 1950s, and electronic fuel injection was used widely on European cars starting around 1980. This test is fast, easy, safe and I have found it to be very reliable. Fuel system cleaner, or fuel injector cleaner, are fuel additives that help maintain your engine and fuel lines clean, and working at peak performance and economy. This is done to LEAN out the fuel mixture to compensate for what it perceives as a rich running condition. Part Number: 121-2900. 634 Cylinders: 2 Maximum Fuel Consumption Per Cylinder (lb/hour) 14. The longer the “pulse”, the more fuel the injector sprays. LS1 Fuel Injector scaling for changing injectors. Gasoline Direct Injection (GDI) is a new technology that follows Port Fuel Injection (PFI). 1-second cycle, the fuel injector duty cycle equals 90%. Fuel Injector Clinic says that the injectors are easy to tune and provide great drivability thanks to superior short pulse width control and this matching process. On my trinity I have the Injector Pulse width Cylinder 1 to be read but it doesn't. Page 1 of 2 1 2 Next >. I've had the same problem for a while now. Fuel Injector Specs IWP048 Fuel injector 5 hole – Cone spray, fuel injector Description This IWP048 “Pico" top feed injector is a production component with a multi hole ‘cone’ spray pattern and a wide range of applications for engines typically up to 30bhp per cylinder (depending on injection pressure). We have analysed how the. Problem #3 – Foreign Object Inside Injector. The main purpose of the paper is to present the benefits of the pulse width modulation, an application belonging to the electric field. This has the effect of allowing you to deliver more fuel in less time, at greater boost, without. Fuel Injector Outputs (Injectors) All terminated harnesses have a fuel injector connector. Please see the table below to get a rough guide as to what sort of ratios you should be putting into the calculator if you are running alcohol. If the injector is just kept on longer from the. 12vdc is always applied to the injectors but when you average the applied voltage over a set time span, shorter pulses result in lower average voltage (leaner A/Fs) over that time. Newer flash systems basically “wipe out” the. com > EngineDemo. 5 ms this is the time they take to open and no apprecialble fuel is delivered during this time. INJ PW Injector Pulse Width mS VOL FUEL DES Desired Volume Fuel mm^3 MASS FUEL DES Mass Fuel Desired mG MaxFuelCal The calibrated maximum fueling that the system. Now they all vary, but the basic idea is that you try and size the injector for about 80-85% duty at full engine power(ie ratio of actual pulse width to available pulse width). There is one injector for each cylinder, and the fuel is kept at a constant. Higher pressure than 15 psi indicates that there is an issue with the installation. (Limp Home Mode) The injection pulse width is a product of the TPS, MAF, MAP, CAS and MAT sensors. With a pressure capability of 9 bar this injector can flow as much as 3700cc/min with excellent low pulse width linearity, and has the broadest operating range of any injector on the market. If hitting this limit, strongly consider whether larger injectors are required. Anything but diesel fuel can wear out the fuel pump bearings, which means the fuel injectors will not receive the fuel at the pressurized level (30,000 psi, 40,000 psi, etc. 100 would indicate a wider injection pulse width. 02 SENSORS & FUEL INJECTORS (This is an internal page of the JAGUAR FUEL INJECTOR SERVICE. An LTFT Adaption Valueof 0. #2 dropped again today. MSD Ignition Atomic EFI Master Kit Max 525 HP. Main Injection Step 1 FUEL MANAGEMENT SYSTEM 46 • Pulse width controlled current energizes the open coil, magnetic force moves the spool valve to the open position. 4 volts to the no. What prevents many tuners from diagnosing the the problem of poor power production caused by variances in fuel injector fuel delivery rates, is the use of O2 sensors on dynamometers, and "tuning to an A/F Ratio" schemes, as promoted by "sellers" and "marketers" of dynamometer equipment. New wires, plugs, cap, rotor, fuel filter,etc have spark, have fuel at the back of the tbi. In practice, the increase in injector pulse width is achieved by pressing harder on the engine accelerator pedal. Ce este Injector de combustibil Pulse Width? Toate motoarele auto moderne folosesc injectoare de combustibil pentru a furniza combustibil în camera de ardere. Quote Reply. Fuel Pressure Modification. 4 ohm: Click the button below to add the DEATSCHWERKS 17U-05-0095-8 95# FUEL INJECTORS. The injector durability experiments were conducted employing pulse widths and frequencies representative of engine operation at moderate speed, high speed, and maximum speed conditions. They feature a precision-lapped disc valve, high-quality brass windings, and high-temperature O-rings. This allows for some future horsepower increases. But like I said, it depends on your rail pressure differential, the specific fuel injectors you have installed, and the BSFC of your engine/exhaust. 2 (a) SPFI connected to Injector Housing and (b) Technical drawing of SPFI. Fuel rail pressures stay about the same - injector duration is varied for operating conditions. Dual pulse injector pulse width will be nearly double that of normal idle. Systems like these offer the best of both worlds. The heart of the circuit is the transistor current source which charges cap C10 to form an integrator. Synonyms for injector in Free Thesaurus. 6% difference in flow between the two injectors, but at. The paper reports on an experimental investigation of the relationship between the pulse width of a gasoline engine port fuel injector and the quantity of the fuel injected when butanol is used as a fuel. No pulse at all from either injector? This thing ran when I parked it to work on it. It states that an 800 us pulse is required to open the spool and another 800 us pulse is required to close it. MATCHED SET OF 8 FUEL INJECTORS 42LB/HR. The amount of fuel supplied to the engine is determined by the amount of time the fuel injector stays open. If there is one component out of place, it could throw off the whole fuel system. Characteristic Injector Flow Curve 400 6. Steps to check the injector coil. LB7 & LLY DURAMAX – Actual Fuel Pressure; LB7 & LLY DURAMAX – Desired Vane Position; LB7 & LLY DURAMAX – Actual Vane Position; LB7 & LLY DURAMAX – Injector Pulse Width 1; LB7 & LLY DURAMAX – Injector Pulse Width 2; LB7 & LLY DURAMAX – Injector Pulse Width 3; LB7 & LLY DURAMAX – Injector Pulse Width 4; LB7 & LLY DURAMAX. Pulse Repetition Interval (PRI) is the time between sequential pulses. See all 41 photos We chose to make our own sensor mount using a piece of fuel. Your calculations all look ok as far as the mass air flow and fuel flow go but remember that this assumes 100% VE which is unlikely. In between those pulses, you also need time for the injector to actually inject fuel. When you first start a typical engine, the pulse width is around 4 milliseconds but as soon as the engine "catches" the pulse width is shortened to about 2. Now they all vary, but the basic idea is that you try and size the injector for about 80-85% duty at full engine power(ie ratio of actual pulse width to available pulse width). This is the percent of time that the injector is actually open (which is also referred to as pulse width) vs. By using water injection, the cooling effect of the water lets the fuel mixture run leaner at its maximum power setting. Fuel Injector Clinic injectors are flow tested and rated at 43. The primary's Start Of Inject (SOI) specifies the beginning of the legal injection window and the EOI of the "make-up" pulse defines the end of the legal injection window. Areas of interest where. Another basic issue: recent factory fuel injection systems are called sequential, because each injector is pulsed individually at the optimum time. 2 degrees of the NO CUTOUT PULSE WIDTH, by comparing the CUTOUT PULSE WIDTH values to the NO CUTOUT PULSE WIDTH values. The IDM sends a 110 volt pulse-width modulated signal to the injector solenoid. This may potentially cause lean conditions at high RPM. A typical fuel injector Electronic fuel injection has come into its’ own in the last 10-15 years for the same underlying reason as most of the other amazing technological changes – the development of. Page 1 of 2 1 2 Next >. V PWR--Battery Voltage--RPM--CaMshaft Position sensor--ICP--Injection Control Pressure--FuelPW--Fuel Pulse Width: When starting V PWR should be above 10volts, ICP should be at least 500psi, at least 100RPM, and FuelPW 1mS-6mS. a scan code reads; injector pulse width very high, 92MS. 630cc for up to 420bhp. Use in your IFR table. Many military aircraft engines of the 1940s utilized a pressure carburetor , a type of fuel metering system similar to a throttle body injection system. MATCHED SET OF 8 FUEL INJECTORS 42LB/HR. If any CUTOUT PULSE WIDTH values are within 0. Harley-Davidson Electronic Fuel Injection Project: Maximum Air Delivery (MAD) is required in order to create a high performance engine. Great linearity and short pulse width repeatability. “A lot of people wrongly confuse Duty Cycle to mean the actual fuel flow or even the pulse width of an injector,” says Strader. Various fuel injector harnesses plug into this connector. No flashes from the injector circuit when cranking the engine would tell you the PCM is not pulsing the injectors. FUEL INJECTORS. Fuel Injector Outputs (Injectors) All terminated harnesses have a fuel injector connector. rar > EngineSystem6. Maximum Air Deliver Electronic Fuel Injection systems for V-twin engines. The length of injection pulse determines fuel mass delivered, therefore air/fuel ratio to the cylinder. It's no secret -- your car needs fuel. Example of duty cycle. Buy 99-03 7. Synonyms for injector in Free Thesaurus. The ECM meters the fuel output of the injectors using pulse width signals. Newer flash systems basically “wipe out” the. If this is good, then the issue is a bad ECM. Heated Oxygen Sensors • The Heated Oxygen Sensor (HO2S, formerly known as HEGO), shown in Figure 10, is located in the exhaust manifold and monitors the oxygen content. By using water injection, the cooling effect of the water lets the fuel mixture run leaner at its maximum power setting. Each time we open the throttle, the PCM increases the fuel injector's pulse width to keep fuel/air mixture correct. This test requires high speed synchronous analog measurement inputs to record up to 9 injection cycles per stroke with an approx. The amount of fuel being injected depends on pulse width and fuel system pressure. I have a 92 sable with the 3. There is one injector for each cylinder, and the fuel is kept at a constant. Plus the M. Drop in plug fitment! Click Here For Plug and Play Ford ECU Data Choose From:540cc (52 lbs/hr at 43. Fuel Injector Problems Defective Pink Fuel Injector. The heart of the circuit is the transistor current source which charges cap C10 to form an integrator. We know that RPM / 2 = cycles per minute. The object is to have Audrino anaylze the voltage readings of the O2 sensor and adjust the pulse width of the fuel injector to control the amount of fuel entering the engine. Quote Reply. 1 compatible. The length of injection pulse determines fuel mass delivered, therefore air/fuel ratio to the cylinder. The first remains located on the injection pump.