Injector not firing Hello. I have a 1991 Chevy 2500 pick up with a 350 V8. Only the drivers side fuel injector is spraying fuel so the truck is running on 4 cylinders. If I un clip the 2 wires from each injector and switch them to the opposite injectors, the passenger side injector fires and the drivers side does not. The truck again runs on (the other) 4 cylinders. This makes me assume there is no problem with the fuel delivery system or injectors? A test light shows 12 volts to the hot side of both injectors. If I hook the test light to the other side of the injector wires, and to a + battery terminal, The test light flashes as I crank the engine. (same strength pulse rate each injector) If I run the engine with only the 12 volt terminal of the non working injector connected and ground the other terminal (of the same injector) I get a constant spray from the (previously) non working injector. I hope you can understand my description and hopefully tell me what is causing one of my injectors to not fire? :confused::confused::confused: I am leaning towards changing the ignition control module in the distributor, but dont want to change parts to try and find the problem. |
Re: Injector not firing almost wanna say that the injector connector is faulty. |
Re: Injector not firing I took the plastic connectors off the injectors and put the wires straight to the injectors. still no better. when I put 12 volts to the purple/ white wire from the ignition sensor one injector fires the other just wines a little like it wants too but dosent have enough power. while I had the engine running i jumped the downstream (ground side) terminal of the no working injector from the ground side of the working injector. This dumped fuel from both injectors and stalled the motor. I took the jumper wire off and fired it up again and both injectors are working fine :confused::confused::confused::confused::confused: This problem has been intermitant for a few months, then yesterday the problem stayed. hopefully it does not come back. |
Re: Injector not firing faulty connection somewhere then, I almost wanna say bad ground but I dont see how that'd only effect one injector. weird. |
Re: Injector not firing Doesn't the ECM control the injectors by switching the ground on and off? Faulty ECM or broken wire/bad connection on the ground wire to the non-functioning injector. |
Re: Injector not firing Yes your right. I found a wiring diagram on line and the problem is in the blue wire that goes from the injector to the ECM. The problem has been intermittent, so I now carry a multi meter on the dash in anticipation of the problem re occurring. When it comes back I will test the blue wire, from the injector to the ECM, for continuity. If the wire is good, a neighbor has the same truck and I will temporarily put my ECU into his truck to see if it gives the same symptoms. Thanks. Colin. |
Re: Injector not firing
Originally Posted by losttheplot
(Post 5012772)
Yes your right. I found a wiring diagram on line and the problem is in the blue wire that goes from the injector to the ECM. The problem has been intermittent, so I now carry a multi meter on the dash in anticipation of the problem re occurring. When it comes back I will test the blue wire, from the injector to the ECM, for continuity. If the wire is good, a neighbor has the same truck and I will temporarily put my ECU into his truck to see if it gives the same symptoms. Thanks. Colin. |
Re: Injector not firing
Originally Posted by Cam_RS
(Post 5791124)
"losttheplot" did you fix it? I have the same issue as yours. My driver side injector does nothing, no power on red wire and no ground on ecm. RBob. |
Re: Injector not firing
Originally Posted by RBob
(Post 5791148)
Fix the no power to the injector first, as that has no bearing on the ECM. There is a fuse for each injector: INJ1 & INJ2, best place to start. RBob. No signs of broken wire on injector wire (red) and (white) both have good continuity. I still get no power on injectors and no pulsing at all? how do i fix this?.. :( |
Re: Injector not firing
Originally Posted by Cam_RS
(Post 5793196)
No signs of broken wire on injector wire (red) and (white) both have good continuity. I still get no power on injectors and no pulsing at all? how do i fix this?.. :( It might be that the ECM is providing the ground, but with no power on those wires, the system still doesn't work. It's good advice to fix the power first. |
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