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1990 eighty eight 3.8l. Why no fire/pulse to the injectors?


The camshaft sensor may be bad. Check the fuse for the injectors and it is possible the ECM is bad or the injector drivers more specifically are bad in the ECM .

Nov 24, 2015 | Oldsmobile Cars & Trucks

1 Answer

No injector pulse 4 cyl 93 f250 460


if you have a $5 test light, you could find the problem. just know that all eight injectors have a constant voltage applied to them anytime the key is in run or start. and also that 4 of the injectors share a common ground, they have their ground wires spliced together before the ground wire enters the pcm to be internally grounded. and the other four injectors are the same- their ground wires splice together. so your four that don't pulse have lost either the power to them, or the common ground wire for the 4 may have broken. or lost connection.

it is easier to check the power side first, so clip a test light lead to the negative battery post or cable, turn the key to on,and probe each injector connector. one of the terminals at all eight injectors will be the power wire, and it should light up the test light. if all eight injectors have power to them, you know it must be a ground side problem. if you find that 4 injectors have no power to them, look for a broken splice in the power wire to all injectors. back in those days, injectors were "bank fired". one side or bank of the engine all had the injector grounds spliced together, so all injectors on one bank fired (pulsed) simultaneously, and then the other bank was fired or pulsed. that was good until sequential injection matched the pulse to the cylinder ready to fire, more precise, and in the modern systems each injector ground has a separate ground inside the pcm. no more splicing of the ground wires, and having bank fired engines.


when the pcm grounds the circuit, the injector coil is energized and the injector opens to spray fuel out. so the injector has constant voltage to it. only when the circuit is grounded is that power applied across the injector.

Jan 22, 2015 | Cars & Trucks

1 Answer

3 rear cylinders not firing


Check the grounds from the rear injectors to the computer. On a bank fired system as yours, all 3 injector grounds on each bank splice together before they go into the computer. Check wire continuity from injector to the computer connector with the ohmmeter.

Jul 21, 2014 | 1989 Oldsmobile Cutlass Ciera

1 Answer

Engine only firing on left bank rtf. Side no. Fire will start and idle


Check for spark on the side not firing. If there is spark, the injectors on the right side may have a problem in the wiring to them. Older multi port injection systems used a "bank fired" approach: all the injector grounds on one bank splice together before they go into the computer to be pulsed.
All of the injectors have a steady voltage applied to them when the key is on. The same color wire to all injectors is the power wire, it is a fused circuit, the fuse is in the power distribution box, and is hot in run or start. When the computer internally grounds the injectors, pulse occurs and fuel is sprayed out. Check if the right side has power to the injectors with key on, use a voltmeter or test light. To test an injector circuit, purchase a cheap "noid light" from a parts store. You plug it into an injector connector, then crank the engine over. If the noid light is blinking, the power and ground circuit is good for that injector.

Jun 28, 2014 | Cars & Trucks

1 Answer

I need the firing order for the injectors for f-150 ford 4x4 king cab


when you put the harness in place the plugs for the injectors should be close to were they go the injector plugs cant be mixed up they wont reach to the other injectors

May 23, 2014 | Ford F-150 Cars & Trucks

2 Answers

Why would a cylender not fire if the plug has spark and all other cylenders are firing?


What test told you it is not firing?

You may have valve damage &
little compression

Jan 09, 2013 | Cars & Trucks

1 Answer

What causes injector not firing gas?


FUEL INJECTOR NOT FIRING COULD BE FAULTY FUEL INJECTOR.HOOK A NOID TEST LIGHT TO FUEL INJECTOR ELECTRICAL CONNECTOR. CRANK THE ENGINE WATCH THE NOID TEST LIGHT SHOULD BE BLINKING WHILE ENGINE TURN OVER.IF TEST NOID LIGHT STEADY PCM FAULTY NOT FIRING THE FUEL INJECTOR.IF FUEL INJECTOR DONT BLINK OR LIGHT UP.YOU HAVE OPEN WIRING CIRCUIT TO THE FUEL INJECTOR CONNECTOR.

May 13, 2011 | 1990 Geo Tracker

1 Answer

Injectors s10 1991 .the injectors wont spray they have electricyty on the wire on the injectors fuelpomp works have fuel in line .its just the injectors wont sent inpuls.


So your saying fuel pump giving you pressure but ALL injectors are not firing. IF ALL INJECTORS ARE NOT FIRING AND FUEL PUMP IS A-OK THEN ECU IS THE PROBLEM.
However, if a few are not firing then its probably those injectors.

Jun 14, 2010 | 1991 Chevrolet S-10

3 Answers

Good spark -- fuel supply line has fuel -- will not start -- either sprayed into air intake -- car immediately fires -- why are cylinders not getting fuel?


possibly a bad pressure regulator or injector module not letting the injectors fire. check out both more than likely the injectors are not firing.

Aug 30, 2009 | 1989 Buick Riviera

1 Answer

Starting


what do you mean "no fire on 1 side of injectors??" 1 injector no firing?? or what?? was the engine that you put in there used?? from junk yard?? If so, put the injectors back from your engine onto the engine you just put in there.

Aug 10, 2008 | 2002 Nissan Altima

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