single cylinder misfire at idle
Thread Starter
AudiWorld Senior Member
Joined: Jan 2004
Posts: 1,417
Likes: 28
From: Ocean Isle Beach NC
single cylinder misfire at idle
My 2000 A6 2.7 just began to misfire on cylinder 6 at idle. DTC 16690 P0306 -35-00 Using VCDS I can see the misfire count increase on only this one cylinder and only at idle. If I accelerate to 1000-1200 rpms then it clears up and shows 0 misfires.
Is this a coil issue? or ??
Any suggestions?
There was also a store for cylinder 3 misfire, but once I cleared it and idled the engine it did not recur.
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 -
16690 - Cylinder 6
P0306 - 35-00 - Misfire Detected
16687 - Cylinder 3
P0303 - 35-00 - Misfire Detected
Is this a coil issue? or ??
Any suggestions?
There was also a store for cylinder 3 misfire, but once I cleared it and idled the engine it did not recur.
16684 - Random/Multiple Cylinder Misfire Detected
P0300 - 35-00 -
16690 - Cylinder 6
P0306 - 35-00 - Misfire Detected
16687 - Cylinder 3
P0303 - 35-00 - Misfire Detected
Last edited by clancy; Dec 30, 2013 at 04:38 PM.
Thread Starter
AudiWorld Senior Member
Joined: Jan 2004
Posts: 1,417
Likes: 28
From: Ocean Isle Beach NC
bought the car 2 years ago from an audi tech. he fixed anything that had issues but not likely things that did not require replacing. was his wife's daily driver and he wanted it reliable but not perfect. been good with almost no issues. no history on the parts. assume the plugs are not original but don't know for sure. assume the coils are originals. 175000 miles yeah I know, just replace. but hate to throw parts at it if I am not sure of the reason.
AudiWorld Super User
Joined: Aug 2004
Posts: 3,277
Likes: 2
From: Toronto
bought the car 2 years ago from an audi tech. he fixed anything that had issues but not likely things that did not require replacing. was his wife's daily driver and he wanted it reliable but not perfect. been good with almost no issues. no history on the parts. assume the plugs are not original but don't know for sure. assume the coils are originals. 175000 miles yeah I know, just replace. but hate to throw parts at it if I am not sure of the reason.
Swap coils with another cylinder and see if the misfire moves
Also won't hurt to check the condition of the plugs while you're at it.
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AudiWorld Super User
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From: NE Ohio
At this point Clancy I'd be wondering where the tip is, might be worth it to pull the new plug and scope out the bottom of the piston if you can and use a shop vac with a smaller polyvinyl hose to suck it out or a mag-tipped flex probe.
Good find though!
Good find though!
Tech Guru
Joined: Oct 2002
Posts: 8,009
Likes: 191
From: Olney, MD
OWEEEE…that looks like a detonation/melted ground electrode. Wonder what kind of gas burning? I've not seen a center electrode just…gone…and the ceramic insulator still there. Melted/burned, yes. Given that it's a 2.7T IIRC that electrode is probably long gone and dinged the turbo blades...