I recently completed a timing belt, serpentine belt, cam shaft seals, and cam tensioner seals replacement on my A6Q 2.8L. Also, replace spark plugs and air filter.
Engine starts and idles smoothly and will rev in neutral up to 4K RPM without incident, however, when in gear and accelerating MIL light flashes, and remains on. I have checked the codes and get
All misfires are on the driver's side cylinder bank.
When doing the initial repair, after removing cam shafts from this cylinder bank I had trouble getting to "exactly 16 rollers" between the cam shaft sprockets as noted in the manual, but managed to have the alignment on each side of the engine look identical. Also, driver's side cam tensioner lost all oil and I didn't realize it needed to be "bled" before installation. Before going back in to repair, I'm trying to narrow the list of culprits. Which is the likely suspect here? cam tensioner; cam positioning sensor; or misaligned sprockets? Has any one seen anything like these misfire codes? and what was the fix?
I'm assuming that this is related to timing as misfires are only when engine is under load.
Do u have it fixed? I have the same problem too, mine is also 4,5&6 misfires, I have the following codes: 16684 - Random/Multiple Cylinder Misfire Detected P0300 - 001 - Upper Limit Exceeded 16689 - Cylinder 5 Misfire Detected P0305 - 001 - Upper Limit Exceeded 16690 - Cylinder 6 Misfire Detected P0306 - 001 - Upper Limit Exceeded 17800 - Camshaft Position Sensor Bank 2 (G163): Open Short to Plus P1392 - 001 - Upper Limit Exceeded - Intermittent 17599 - Linear O2 Sensors: Before CAT: Reversed P1191 - 008 - Implausible Signal 16688 - Cylinder 4 Misfire Detected P0304 - 001 - Upper Limit Exceeded 16538 - Oxygen (Lambda) Sensor B2 S1: No Activity P0154 - 008 - Implausible Signal Readiness: 0010 1001
Your Bank 2, sounds like its out of time, I just fixed a car like this three weeks ago. Did you do the belt by the book, using the special cam alignmment bar, and loosen the cam sprockets? If not, your out of time, the easiest, solid evidence way I proved it on that car, was a compression check: Bank 2@ cylinders all were at: 165 psi Bank 1@ cylinders all around: 190psi
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