3.0 misfire problem - running out of ideas...
Hi, I have a 2002 A4 quattro sport 3.0. It has had problems with misfires. Coil packs have been changed, so has the ignition wiring loom, as the coil pack connectors were cracked. This has improved it considerably, but still there are occasional random misfires. Not enough to trip the warning light, but on vagcom I can watch the counters on all cylinders go up, and you can feel the car twitch at idle as the misfires happen. I am wondering if this is a vacuum fault? If I open the oil filler cap, it creates the same symptoms.
Also, when I am driving hard, the red BRAKE can come on for just a few seconds. I can't believe I emptied the resevoir. Is this a related vacuum fault?
Please let me know any thoughts that could help me!