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Not getting pulses to fuel injectors - 1985 Lincoln Continental

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Fuel filter stopped up, fuel pump relay needs to be checked and replaced or fuel pump itself is bad. Have some get down on their knees at the side of your car and turn on the ignition switch, can you should be able to hear the pump pulse in the tank, if not replace relay and filter first. Pump is inside tank.

Posted on Oct 06, 2010

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1989 volvo gl is not getting fuel to injectures what to do?


check the pressure and flow , if the pressure in the fuel rail is ok the injectors must have fuel to them as they are connected to the rail, may be there is no pulse to the injectors they get a pulse from the computer . if there is no pulse check the fuses.

Oct 02, 2014 | Cars & Trucks

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94 s10 doesn't seem to be getting fuel what makes injector s pulse?


Injectors pulse when fuel pressure is sensed and the cam possition sensor indactes its time to load the intake stroke with fuel for that cylinder.

Apr 15, 2013 | Cars & Trucks

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Turns over but wont start i got fire and fuel to the fuel rail but the injecters are not delivering fuel any ideas whats wronge


sounds like u got no injector pulse comin from ecm.we need to pull ecm codes an review them ,possible camshaft sensors faulty they usually provide reference pulses to ecm for injector firing or pulse.without this pulse ur injectors will never open up to let fuel enter combustion chamber. one way of checking pulse is to connect a noid light(small light bulb that plugs in injector pigtail to chek for power to injector and ur pulsing ground coming from ecm to injector) an test for a blinking light while cranking engine.

Apr 08, 2011 | 1998 Ford F150 Regular Cab

1 Answer

1986 pontiac fiero won't start, changed fuel pump and relay gas coming up, but no spray from injectors


Actually the injectors don't spray "all the time". They pulse open for a few milliseconds then close every time they are grounded by the ECM. The distributor has a pick-up coil (Variable Reluctance sensor) that provides an A/C (Alternating Current) pulse every 120 degrees of crankshaft revolution to the Ignition Control Module also contained inside the distributor. The I.C.M. amplifies, rectifies and passes along the pules as a +12V square wave to the ECM. The ECM uses these pulses to calculate RPM and determine when the engine is rotating vs. stopped. Together with this information and more from Coolant Temp., Throttle Position, Manifold Pressure and Air Temp. the computer constantly 'looks up' what the appropriate amount of time it should pulse the injectors for to deliver the required amount of fuel.
With that in mind, the injectors are supplied with +12V via a 3 AMP fuse labeled INJ 1 for 1 bank of 3 injectors, and INJ 2 for the 2nd bank of injectors. Make sure your injectors are getting +12V whenever the key is ON or they wont fire (or at least 3 won't).
If all 6 injectors have +12V and you have fuel pressure (checked by pushing down in the center of the Schrader (tire valve stem looking thing) valve and fuel SPRAYING out, and your still not getting fuel it is probably because the injectors aren't pulsing. They are probably not pulsing because the ECM is not receiving any reference pulses from the distributor. If you have spark then you are producing reference pulses.
I hope some of this explained from an actual '86 Fiero GT 2.8L V6 owner/mechanic will help narrow down your problem.

Mar 20, 2011 | 1986 Pontiac Fiero

1 Answer

Why does the fuel injector receive no pulse for 1998 ford explorer 4.0 motor


The 6 cyclinder motor has 6 fuel injectors. If your not getting pulse Electrical grond to an injector wire theirs a likly chance your not getting it at another. If your getting no pulse at all the engine won't run. Does the check engine light on with the engine running? What meadod did you determine that it had no pulse? Remove one injector wire one at a time with the engine running? If it's not running at all then the no pulse can be a common system part like the crank senser. Does the engine get spark? Most of the time pulse and spark are hand in hand so if the crank senser were bad it's not going to have s[ark either.

Dec 02, 2010 | 1998 Ford Explorer

1 Answer

Fuel injector won't allow gas to flow into engine, have spark, have fuel psi. All fuses ok. OBD connection won't connect to reader can't get codes.


    Test fuel injector pulse and supply voltage output (test is used for most cars). This test will tell you if the computer system has operating voltage and injector trigger signal. Remove an electrical connector from a fuel injector (it doesn't matter which injector) probe both sides of the connector with a grounded test light
    (there are only two terminals). Have a helper turn the key to the "on" position without cranking the engine and observe the test light. The test light should illuminate one side of the connector only. Next, switch the test light lead to the positive side of the battery to test the system ground injector trigger, probe the side of the connector that did not light up, have a helper crank the engine over and observe the test light, it should blink on and off. If this test checks ok continue to next step. (Note: if no injector pulse is present try disconnecting the remainder of injectors and re-test, if a fuel injector is shorted it can shut down the injector driver causing no injector pulse. If injector pulse returns plug injectors electrical connectors in one at a time until the pulse fails and replace that injector)

    If this test revealed that there was no pulse but system has power the ECM is not generating a fuel injector trigger. If there is no trigger to the fuel injector it will not allow fuel to enter into the engine. Some of the most popular reasons that can cause this condition include a shorted crankshaft angle sensor, shorted camshaft position sensor or shorted ECM/PCM. (When a system trouble code scan is performed it does not always catch a crankshaft angle sensor, camshaft position sensor failure). Tip: try disconnecting all non-essential sensors, example: oxygen sensor, coolant sensor, throttle position sensor, air intake temperature sensor, mass air flow or map sensor and EGR valve pressure differential sensor. Crank the engine over, if the injector pulse returns, one of the sensors is shorted causing the system to not operate. Plug the sensors in one at a time until the injector pulse fails then replace that sensor and reassemble.
    click on this link directly for more details
    This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya

Jan 30, 2010 | 1996 Volkswagen Golf

1 Answer

Will not start, ether in the injectors turns it over


CHECK FUEL PRESSURE AND INJECTOR PULSE, IF YOU HAVE A NOID LIGHT. THERE IS A FUEL PRESS TEST PORT ON THE FUEL RAIL. KEY ON ENG OFF PRESS 35-45 PSI IF ITS A V 8 ENG 50-60 IF ITS A STRAIGHT 6. TO CHECK INJECTOR PULSE DISCONNECT THE EASIEST INJECTOR AND PUT THE NOID LIGHT IN THE CONNECTOR AND TURN THE ENG. OVER IF IT FLASHES YOU HAVE INJ PULSE. START THERE AND SEE WHAT YOU GET.

Aug 04, 2009 | 1992 Ford F150 SuperCab

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