Miss firing on multiple cylinders, is what computer test says, changed spark plugs, wires, and a coil cause the middle one (5,2) wasn't firing after all that still miss fire. What else could it be??

Asked by Feb 17, 2015 at 10:30 PM about the 2008 Pontiac Grand Prix Base

Question type: Maintenance & Repair

3 Answers

20,150

The other 2 coil packs. Are the plugs gapped properly? Are the plug wires seated to the coil and spark plugs fully?

1 of 1 people found this helpful.
210

plugs not hot enough or not original plugs burning up coils

70,255

If one of the coil packs failed, the others may be weak. HTH. -Jim

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