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Where are the sparkplugs on a 2003 gmc envoy - 2003 GMC Envoy

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You have a 4.2L inline 6 cylinder, on top of engine you'll see six coil pack's running front to back on top of the motor, disconnect harness on each one remove small bolt's pull all six coil pack's out, spark plug's will be in there.Don't worry you don't have to put the coil pack's back in the same hole.

Posted on Dec 12, 2009

  • Alexander Mimun
    Alexander Mimun Dec 12, 2009

    You don't have to put the coil pack's in the same hole they came out of.

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1 Answer

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