Question about 2002 GMC Envoy

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Sparkplugs Where are the psarkplugs on a 2004 GMC Envoy located?

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  • Anonymous Mar 17, 2014

    trying to located cylinder # 2

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  • GMC Master
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They are along the top of the motor. You must remove the box that says Vortec 4200 on top of the motor. Under that you will see six coil packs that have the spark plugs underneath them. Carefully undo the bolts and lift them off the plugs. Remove the plugs etc.
Remember it has an aluminum head so care must be used at all times to ensure proper torque in achieved.
Plugs are designed to last 100,000 miles on these engines. If you do not have a misfire before then it is suggested to leave them alone.
Good luck and hope this helps.

Posted on May 25, 2009

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  • Master
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Try this website www.alldatadiy.com for the most part there are under the fuel rail between the injectors i also would like to give you this information if you every have any hard to find GM-parts its Schram auto & truck parts 1-800-292-1032 and they website is www.schramauto.com

Posted on May 25, 2009

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