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Dieseling problem

Discussion in 'Trucks and Trailers' started by Dirty Water, May 7, 2006.

  1. Dirty Water

    Dirty Water LawnSite Fanatic
    Posts: 6,799

    I have a 87' 3/4 ton chevy with a smallblack on it. Completely stock engine. Lately its developed a bad dieseling problem. I cannot shut it off until its completely warm, or it just pops and backfires.

    I'm thinking the cold start system, or the choke on the carb, but I thought I'd ask if anyone else had any idea's?
  2. Dirty Water

    Dirty Water LawnSite Fanatic
    Posts: 6,799

    Heh, smallblock...stupid 10 minute edit rule :laugh:
  3. lawnmaniac883

    lawnmaniac883 LawnSite Silver Member
    Posts: 2,613

    Try premium fuel...
  4. xcopterdoc

    xcopterdoc LawnSite Senior Member
    Posts: 752

    Check the choke or if it has TBI, check for a leaky injector. Check all the basics also, timimg, plugs ect. It could be a lot of things, to include clogged EGR passages, carbon build up on valves/pistons ect.
  5. Dirty Water

    Dirty Water LawnSite Fanatic
    Posts: 6,799

    I just pulled the air cleaner assembly off the carb and the idle stop(?) solinoid has a broken connection to the wire, its all melted, obviously it had been arcing.

    I believe this solinoid closes the butterflies when the key is off? If so, I should be able to test this by manually closing the butterflies and having someone turn the key off?
  6. sheshovel

    sheshovel LawnSite Fanatic
    Posts: 5,112

    Yes Dirty you should be able to test it in the manner you describe.
  7. Dirty Water

    Dirty Water LawnSite Fanatic
    Posts: 6,799

    I've got a new idle stop solinoid ordered, and I lowered the fast idle down a good bit (it was really racing).

    With the fast idle down, the truck shuts off just fine. I will replace the solinoid though.

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