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78 FJ40 sputters and dies at stops

Discussion in '40- & 55-Series Tech' started by baldboy, Aug 13, 2006.

  1. baldboy

    baldboy

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    I finally tried out my 4wd and was driving on some pretty steep grades. I was working the engine pretty hard for about 15 minutes.
    When I got back to the paved road I got out to unlock the hubs and the motor was struggling and then died.
    Started right up-almost instantly.

    Drove down the road to first stop sign, engine struggles at stop and wants to die.

    If I hit the gas it springs to life again.

    Parked it for an hour, went to start it and it started better than ever.

    Get to first stop, motor struggling again.

    Drive down the road, cruising downhill in neutral, go to slide back in gear only to find out the motor had died.

    (starts right up)

    Get to next light, motor dies :mad:.

    You get the idea. Drives strong but won't idle after driving.

    Its not overheating and it has gas and oil.

    Is this ANOTHER fuel-related problem?

    Thanks
     
  2. mel lowe

    mel lowe Cruiserjunktion@gmail.com Supporting Vendor GOLD Star

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    check the fuse panel......

    on a 78 2f the idle circut is controlled by a soleniod on the carb

    it must have power to allow the carb to go into the idle circut

    it sounds like your truck is running fine on the primary and secondary circuts

    just not the idle circut

    I had the same problem, and a new fuse was the answer

    the old fuse looked good but was blown on one of the ends

    start here with your test light
    idle 2f.jpg
     
    Last edited: Aug 13, 2006
  3. sbrecke1

    sbrecke1

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    Same Problem

    The exact same problem JUST (yesterday afternoon) happened to me - minus the steep grades and pushing it a bit hard. Gotta stay on the gas or it dies. Eventually, it becomes a bit tougher to start after each shut down. WTF? Will check out the fuse. Thanks a bunch.

    Sam
     
  4. sbrecke1

    sbrecke1

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    Sorry to hijack - but I might need different advice than baldboy. Mine's a 72 with original F. Is the fuse still in the same place? Or am I probably looking at a totally different problem and solution? Thanks.

    Sam
     
  5. mel lowe

    mel lowe Cruiserjunktion@gmail.com Supporting Vendor GOLD Star

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    pm'd you

    your carb's idle circut is vac operated....

    fuses aren't your answer
     
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