Question about 2003 GMC Yukon XL

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2003 yukon cold start problem

After 5 years of instantaneous starting, my Yukon recently started taking several seconds (3-5) of cranking before it would start. This is only an issue after a few hours of non use. I replaced the filter and pressure regulator with no improvement. A mechanic tested the pressure which was in normal limits. I've run a tankful of Lucas fuel conditioner/cleaner, but I've seen no improvement. A slight tap of the pedal during cranking seems to help a little.

Specs: '03, 5.3 litre, flex fuel, Z vin code

I would REALLY appreciate any advice you can give.
Coppell, TX

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  • karlcolecfp Nov 11, 2008

    Wow, thanks for the ultra fast reply. I'm not a mechanic and it seems if my alternator was acting up it would show in other ways too, but I'll have it checked out. Thanks!!!

  • wardx31 Nov 21, 2008

    My 2003 Yukon XL runs GREAT, the problem only persists upon start-up when there is less than 1/4 tank of gas and it has sat for more than 12 hours. When those two factors occur, my truck won't start (like in the morning). If it's already started for the day, I can run my truck out of gas if I had to and it runs great! But, when it's low on gas and has sat for more than 12 hours at a time, it just won't start. During the situation, we can insert 1 -2 gallons of gas into the tank, and it usually starts right up. We too have had our fuel pump tested and it has tested fine. Any suggestions? Where do we start on the road to fixing this problem.

    A quick response would be much appreciated! It halls my triplets and my 4 year old all over so it's very inconvenient.

    Thanks in advance!
    Scott Ward

  • ben_valent Nov 26, 2008

    I don't see how a device that only operates AFTER the
    car gets started and is running ok, can have an effect
    on PRE-starting conditions? The alternator does NOTHING
    during crank. All juice during cranking is supplied by
    the battery.
    My 1999 chevy 5.7 vortec has the same problem.
    hard or no start when cold. Your first suggestion to this
    problem SHOULD have been to suggest spraying
    ether (starting spray) into the cold air tube.
    My truck starts instantly after using ether.



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Alternator needs tested (scoped ) for any dirty power (spikes)...that simple test will eliminate soo many electrical gremlins i cant stress it enough.....causing bad floating grounds and computer misreads of sensitive sensors without tripping codes ... replace alternator if suspicious and watch your other seemingly unrelated issues disappear :)......i know i know i am using a crystal ball here tonight and going out on a limb about this one .... but humor me and test alternator before investing too much other time and money :) good luck

Posted on Nov 11, 2008


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