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Why does it deisel?

Discussion in 'The Garage' started by 82_k5, Feb 14, 2004.

  1. 82_k5

    82_k5 Registered Member

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    My 82 with a 305 diesels sometimes but not always when i turn it off. /forums/images/graemlins/confused.gif What causes this? I would really like to fix it because i'm sure that it can't be good for it. Thank you for your help. /forums/images/graemlins/ears.gif
     
  2. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    1. Too much timing

    2. Idle set too high

    3. Carb set too rich.

    Generally, one of those three are to blame for run-on. Start with your timing and go from there, brother.
     
  3. 84k5

    84k5 1/2 ton status

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    I had the same problem. Turned the idle down and haven't had it since.
     
  4. jakeslim

    jakeslim 1/2 ton status

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    could not adjust mine from dieseling. I adjusted everthing. Finally fixed with a new carb(edel quad). Not
    one problem since. Not even a sputter!
     
  5. 82_k5

    82_k5 Registered Member

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    I think it may need a new carb. how much do you think a good reman. one from schucks or napa would set me back? I'm on a pretty limited budget right now.
     
  6. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    One small thing is that I had the same prob with my 406 for a while and couldn't figure it out why it would diesel every once and a while...turns out that it was the springs and weights in the dist. getting stuck way to advanced at idle. when Oakdale Performance Dyno & Tuning rebuilt and recurved the dist it has been perfect ever since. /forums/images/graemlins/waytogo.gif /forums/images/graemlins/woot.gif
     
  7. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

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    Or if the choke is not opening all the way, that was the problem on mine.
     
  8. jakeslim

    jakeslim 1/2 ton status

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    oh yeah, i also put in a new ditributor at time of carb change. Pretty much cleared up all those "little" engine
    timing problems, so it could have also been the advance springs that were going.
     
  9. dyeager535

    dyeager535 1 ton status Premium Member

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    My '83 would diesel when I shut it off. The AC idle kicker solenoid wasn't working right (probably because all of the other AC stuff was removed lol) and bumped up the idle at certain times, causing it to diesel.

    I unplugged it to test, sure enough, problem disappeared. Easy enough to check.
     

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