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Tinker, GMC Technician
Category: GM
Satisfied Customers: 75
Experience:  speedy muffer and brake tech / Do it yourselfer
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2006 GMC Envoy: spark parts store..plugs at .043/ac

Customer Question

I recently changed the spark plugs in my 2006 GMC Envoy and it is now idling rough and dies when it is idling. THe auto parts store told me to gap the plugs at .043/AC Delco plugs. Could the plugdsbe gapped incorrectly or could it be something else
Submitted: 8 years ago.
Category: GM
Expert:  Tinker replied 8 years ago.
The gapping on your spark plugs could be incorrect or you have mixed up the wires and it doesnt fire in the right order because of that. Check to make sure those two things are right and it should fix the problem for you. Hope this helps.
Customer: replied 8 years ago.
What is the correct gap spec for the plugs??
Expert:  Tinker replied 8 years ago.
What motor is in it?
Customer: replied 8 years ago.
IT has a 4.2 Liter 6 cylinder
Customer: replied 8 years ago.
4.2 Liter 6 cylinder
Expert:  Tinker replied 8 years ago.
The spark plugs should be gapped at 1.3mm but if you wanted to double check the gapping is listed on the info sheet thats stuck to your air filter box. Hope this helps.
Expert:  Tinker replied 8 years ago.
Sorry the gap is .043.
Expert:  Tinker replied 8 years ago.
Sorry the gap is .043.

Expert:  Tinker replied 8 years ago.
If you copy and paste this into you browser on page 3 is the firing order and diagram for you.