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1991 ford f150 with weak injector pulse on both bankls

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6ya6ya
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Posted on Jan 02, 2017

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  • 4 Answers

SOURCE: no start

if it runs on starting fluid its a fuel problem.. check fuel pressure even if its a couple of pounds off, the vehicle will not run. but using starting fluid may give you the extra poundage you need to make it run . also check vacuum hose at pressure regulator on fuel rail

Posted on Aug 02, 2008

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SOURCE: 1991 oldsmobile cutlass supreme

Check for fuses/power/ground to the engine computer (or injector drive computer) whatever the case is.

Spark, fuel pump, and starter all are independant of the fuel injection computer.

Either the computer itself has gone bad, or it is not receiving power or ground, or wiring to the injectors might be bad...

Posted on Aug 28, 2008

  • 1 Answer

SOURCE: 1991 chevy camaro 3.1

Mine had a similar problem, there is a wire that goes from the computer to the fuel rail and this wire sends info on how much fuel and when to inject the fuel... if that wire is grounding out then this will cause the lack of cylinders to fire and also explain the inconsistency. So i would start with the fuel rail..hope this is of some help

Posted on Jan 08, 2009

  • 383 Answers

SOURCE: Little to no injector pulse only when starter is engaged

95-97 Maximas had a problem where condensation from the A/C would accumulate in the a/c evaporator case from the drain becoming restricted or blocked, When this would occur, condensation would drip onto the ECM and a problem would develop with misfire and/or starting. I would look at the ECM where the harness connects to it for corrosion problems. If you find it, there is a chemical spray which can be used to clean the terminals and/or you can clean them, although it is time consuming and difficult to due because of how small the terminals are. After things are cleaned up, lightly coat the connections with a dielectric grease. This will prevent electrolysis.I believe you can buy these at Radio shack and possibly at an automotive parts supplier.
Also a drop in voltage during the cranking phase will cause a weak spark. Your ignition is what pulses the injectors. It takes a minimum of 9.6 volts, but ideally you want at least 10.5 or more during the cranking phase if you want to get a spark worth anything. Check the voltage on the primary side of the coil while cranking the engine.
I'll watch to see if things work out for you, let me know. ....mybunkey

Posted on Apr 18, 2009

  • 73 Answers

SOURCE: I have a 92 Ford Aerostar no injector pulse!

OK YOU HAVE SPARK IN THE WIRES AND YOU DO HAVE GAS TOO AND THE CAR DOESNT START OR THE ENGINE DOESNT TURN OVER

Posted on Jul 31, 2009

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Do the injectors have power from the EEC relay, and injector pulse from the computer ?

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Do you have power going to the injector ? And do you have spark to the plugs ? The computer uses the crank signal from the distributor to know when to fire the injector.

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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.

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No fuil to injection on 5 L. straight 6


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I have just replaced the injectors in my 1991 ford f-150 and now it runs worst than it did before i replaced the injectors it seems like it is dumping nothing but fuel


Different injectors have different flow rates.
I would check to make sure you put in the same size injector.
You can't always trust the kid at autozone to know what he's doing when it comes to generic injector part numbers

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2002 ford f150 4.2 is not starting has feul pressure ,spark on wires yet wont start


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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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