Question about 2003 GMC Yukon XL
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.
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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Posted on Jan 02, 2017
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