Question about 2002 GMC Yukon Denali

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My 2002 GMC Denali XL doesn't like to start on the first crank (especially in warm weather). Typically it starts on the second crank. I have cleaned the throttle body valve, MAF, replaced the battery and alternator. This problem have been going on for at least the last 50,000 miles (truck now has ~155,000). What could be wrong - vapor lock, fuel filter, other?

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The fuel filter would be the first place i would go, especially if it has not been replaced recently. it can cause slow priming of the fuel pump, resulting in hard starting. in addition, if your truck has never been tuned up, a set of spark plugs could make the world of difference - i believe on your particular truck it is recommended to change them at least every 100,000 M. good luck!

Posted on May 28, 2010

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