I have a '92 GMC 1500, and everything is going fine and the other day my injectors just shut down for no apparent reason. The fuel pump is going all the way up to the Throttle body, but it isn't going thru the injectors. Please help?
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Is the vehicle equipped with a security system that may be tripped? If so, the injectors will shut down. The injectors are grounded by the PCM . You may have an internal Issue with it. Is the spark also shutting down when the injectors aren't working? If so, this could be a crank shaft sensor failure. Is there any diagnostic engine codes that can be retreived to possibly isolate the problem?
check to be sure you have fire to the plugs and also check to be sure you have fuel to the engine. Not sure what year you are working on but if you have fire and fuel to the injectors or tbi unit then check to be sure cat converter or muffler is not plugged putting back pressure on engine. If you put fuel in the tbi unit and it starts better go to the fuel pump.
Sounds like a bad fuel injector. Back in the day we would let them runout in the parking lot and when they stalled we would rip off the intake plenum as fast as possible and ohm check the injectors. They should be around 13 ohms. If they are significantly less, say 3 ohms, than those injectors are bad. This system bank fires the injectors. Meaning that all three injectors on the front back fire at the same time and all three of the injectors on the back bank fire at the same time. If one injector hoes bad it will shut down the whole bank which will stall the engine.
Good Evening, you might want to check those injectors, I can not remember for certain but that setup was sequential and when one or two have a problem it would take out the rest. Ohm out the injectors and see what you have there.
heat related issues usually fuel blockage or electrical resistance to ignitors...run on indicates fuel issues at pressure head not shuttign off fuel.. so check there first...also many related engine management sensors are related to fuel dilvery so get code checked and computer tested/.... good luck