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speedshifter
07-27-2009, 08:14 PM
I've been struggling with a misfire issue issue for over a week on my 2004 Audi S4. I first got a P0306 and P0308 code. Cylinder 6 & 8 misfire on bank 2.

1) I first tried replacing the ignition coils. Still having the issue.
2) I put in fuel injection cleaner. Cylinder 6 cleared up but misfire continued on Cylinder 8
3) I have had the car compression tested and pressure was between 170-180 across all cylinders.
4) I replace all four fuel injectors on bank two. However the P0306 and P0308 came back.

I started to notice that I had issues trying to start the car a month ago. I would turn the key but the engine wouldn't turn over right away. Could a bad fuel pump relay, clogged fuel filter, or bad fuel pump cause this misfire. PLEASE HELP I'm not sure what else the issue could be beside a faulty ECU or an internal problem.