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1992 chevy 350 3500k

Discussion in 'Chevy Trucks' started by kandklandscape0, Dec 18, 2009.

  1. kandklandscape0

    kandklandscape0 Senior Member
    Messages: 113

    working on a 92 chevy 350 3500k 4x4. tbi injected.

    the engine is dumping to much fuel in the motor, and it is causing it to run horrible and of course, 3 mpg. if that.

    so far we replaced distributor, rotor, cap, wires, temp sensor, throttle body sensor, injectors. what else is there? it still is running like a dog.

    do you think the computer is bad?
  2. mxjake387

    mxjake387 Junior Member
    Messages: 26

    try checking your O2 sensor.
  3. cubicinches

    cubicinches PlowSite.com Addict
    Messages: 1,415

    Check the fuel pressure regulator spring in the throttle body. It's probably in pieces.
  4. JohnnyU

    JohnnyU 2000 Club Member
    Messages: 2,040

    This is probably the culprit. They commonly corrode and fail, even more commonly on plow trucks.
  5. kandklandscape0

    kandklandscape0 Senior Member
    Messages: 113

    the right side injector is dribbling and the left side there is no spray or dribble
  6. kandklandscape0

    kandklandscape0 Senior Member
    Messages: 113

    the spring is fine. we checked it and replaced it.
  7. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    Have you checked the fuel pressure?
  8. Sydenstricker Landscaping

    Sydenstricker Landscaping PlowSite Veteran
    Messages: 3,882

    There might be a broken wire or something not sending the right signal and not allowing the injectors to function properly
  9. Thermos017

    Thermos017 Member
    Messages: 59

    i haven't seen mention of the IAC yet. if that gets stuck shut or the lines for it get clogged it will create similar symptoms to too much fuel. not enough air = too much fuel. those early 90's tbi rigs were notorious for bad iac's. clean the passages first, and inspect the plunger on the iac. if everything is clean and the passages are clear you may need a new iac. and yes, the computer is a possibility. i've seen a couple that would run, but really rough, and it was the ecu to blame. also, i've experienced similar problems with the icm in the distributor throwing the timing off, causing missfires that seemed at first like the rig was simply running rich. really, you've only scratched the surface of the potential problems that could cause the same symptoms as a rich condition.
  10. Sydenstricker Landscaping

    Sydenstricker Landscaping PlowSite Veteran
    Messages: 3,882

    What about the possibility of the throttle position sensor being faulty or even the egr valve being bad?? My 92 blazer ran like complete shyt (350 tbi) and it turned out the egr valve was sticking.