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Dieseling problem

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Pugsley, Apr 22, 2002.

  1. Pugsley

    Pugsley 1/2 ton status

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    The mighty 305 has developed an absolutely hideous dieseling problem - it only does it under part throttle at speed, and when you shut it down it goes for around 15-20 seconds. I've retimed it, everything else appears to be in order - it shouldn't be the gas, since it's been doing it for 3 fillups now (all premium from different places). My current theory is that it has something to do with a leak or crack somewhere in the 3 miles of vacuum line hanging all over the engine. Anyone know where else to look?
     
  2. Confederate9

    Confederate9 1/2 ton status

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    i dont know if this helps but mine did that but it was only 5seconds
    i changed my oil and it stopped.
    i dont know how that helped, but it did
     
  3. Hossbaby50

    Hossbaby50 3/4 ton status

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    My problem with dieseling wasn't as bad as yours sounds. I got rid of it by dumping a bottle of Lucas Oil Products Fuel system cleaner/ upper cylinder lubricant. I dumped that in with about 1/4 tank, and then dumped another few $ in on top of it, and it helped alot.
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    Just a thought, my '83 dieseled terribly when I shut it off if the AC (or is it decel) throttle kicker was plugged in. It would open the primaries apparently enough when I shut the truck off, to keep it running. I tested it more than a few times, and while I didn't bother delving into it, with it disconnected, I had no problems (nor AC) so I never did track down WHY the kicker was working when the truck was shut off.
     
  5. weisel

    weisel 1/2 ton status

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    Hope you get that fixed. I never figured out why my uncles' did the same thing. You would shut it off and be able to walk inside and get a drink of water before it stopped! Must of been upwards of 40 seconds! Never saw what it anounted to because he swapped the engine for a re-man 350.
     
  6. Pugsley

    Pugsley 1/2 ton status

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    You're a genius!!!!/forums/images/icons/smile.gif - I unplugged it, and no more problem. I'm currently attempting to chase down the current source and see if I can't figure it out.
     

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