Question about 2001 GMC Jimmy

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Only starts when cold

2001 jimmy will start but as soon as i turn it off i have to wait till it cools down to start
can this be the fuel pump or filter


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  • silv_pup Nov 24, 2008

    this seems to make sense i was thinking a modulator or senser but i will let ya know soon

    thanks alot

  • silv_pup Dec 08, 2008

    so in the end it was the alt was not charging fully and it caused the key code to lock thats the security lite you see when you start your car anyway he re did the code and now i just cant use the original key i think i was lucky he did not charge me for finding the problem or the recoding of key and 150 for an alt and work


  • silv_pup Dec 09, 2008

    wow if i had any luck it would be all bad
    my ford 2001 escape while in park revs like its going to blow up and the pedal is not stuck i have to shut the key to stop it
    this has happened 2 times today wow happy xmas to me ya



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I'm not familiar with your truck but this sounds like a cold-start valve that is stuck and allowing excessive gasoline into the intake system. If this is the case, you probably have miserable gas mileage right now since the engine would be running rich continuously.
Starting it warm, probably is causing some mild flooding and getting the plugs wet so they can't fire.
Try this: with the engine hot/warm; press the accelerator slowly all the way down, then try starting it. If it starts this way, this would be an indication that the engine is getting too much fuel for its temperature and opening the air supply fully helps to change the air-fuel ratio sufficiently to allow it to start.   

Posted on Nov 24, 2008

  • Steve Allison
    Steve Allison Dec 08, 2008

    Glad to read your problem is found and thanks for posting it back here for the benefit of others; it sure didn't sound as simple as a tired alternator.

     i think i was lucky he did not charge me for finding the problem or the recoding of key and 150 for an alt and work

    I fully agree; don't lose that man's number ;-)



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