Cylinder Misfire Troubleshooting - Pontiac G6 Forum
 
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post #1 of 3 (permalink) Old 02-27-2016, 01:07 PM Thread Starter
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Cylinder Misfire Troubleshooting

Howdy yall,

2007 G6 GTP
Cylinder 2 misfiring

I replaced spark plug; still a misfire.

I swapped coil pack 2 with coil pack 4; still a Cylinder 2 misfire.

I've reached the limit of my troubleshooting knowledge, any ideas?

2007 G6 GTP
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post #2 of 3 (permalink) Old 02-29-2016, 08:58 PM
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Could be an injector issue, could try swapping those around and see if the problem follows.
Or try some cleaners
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post #3 of 3 (permalink) Old 03-04-2016, 04:07 AM Thread Starter
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FIXED

I added Lucas fuel injector cleaner and the rough idling disappeared and my gas mileage went up significantly from low 20s to 28.5. Engine light still on but I haven't reset it yet.

2007 G6 GTP
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