2009 Pontiac G6 Q&A

2009 Pontiac G6 Question: I have a p0301. Have changed the spark plugs and rotated coils to rule them out.

What should I look at next? -
Answer 1
Check for vacuum leak and injector pulse. Plug wet when removed? If so, check compression. Seems we have quite a following here, hope you get it fixed! -
Answer 2
I'd start looking at the injector or injector wire harness -
Comment 1
Boy i sure wish i had thought of THAT!!! Do you know what injector pulse is? -
Answer 3
When does the misfire occur? At idle? Under a load? Or all of the time? Is it constant or does it come and go? -
Answer 4
Try the intake induction service, Per GM Bulletin. -
Answer 5
Just rotating the coils will not show up a miss fire, as it will just move to another cylinder. Try disconnecting one coil at a time when engine is running. If when a certain coil is disconnect there is no difference in engine missing, you have found a bad coil. -
Comment 1
It will change the misfire code if coil is defective and switched to another cylinder! -