Chasing down some gremlins
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AudiWorld Junior Member
Joined: Oct 2019
Posts: 12
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Chasing down some gremlins
Willing to take any advice chasing down some gremlins on the 2001 Audi A8L I picked up a bit back. I've had this pesky misfire and replaced the things I can think to replace but not sure what else to do.
2001, A8L 171k miles on it. Unknown service and maintenance history as the owner passed away and I bought the car from the family.
Stored codes:
P0300, P0306 - Random misfire, Misfire Cyl 6
P0346 - Camshaft position sensor Bank 2 (drivers or passengers?)
P0102 - MAF (apparently common on these?)
Pending codes:
P0308, P0307 - Cly 8 Misfire, Cyl 7 misfire
Replaced all Spark plugs and ignition coils to begin with just because it usually seems to be these that cause the issue, not it replaced the drivers side camshaft position sensor with a new one, didn't fix the issue but the codes aren't storing just giving flashing CEL now with the above codes.
2001, A8L 171k miles on it. Unknown service and maintenance history as the owner passed away and I bought the car from the family.
Stored codes:
P0300, P0306 - Random misfire, Misfire Cyl 6
P0346 - Camshaft position sensor Bank 2 (drivers or passengers?)
P0102 - MAF (apparently common on these?)
Pending codes:
P0308, P0307 - Cly 8 Misfire, Cyl 7 misfire
Replaced all Spark plugs and ignition coils to begin with just because it usually seems to be these that cause the issue, not it replaced the drivers side camshaft position sensor with a new one, didn't fix the issue but the codes aren't storing just giving flashing CEL now with the above codes.
AudiWorld Member
Joined: Jun 2019
Posts: 51
Likes: 5
From: Vermont
Such a common thing to read. Im also fighting them. The most recent thing i did that seems to be a huge help is taking apart the PCV system and cleaning. Quite plugged and coked.
Cleaned hoses, the pipes and the flying saucer. Everything seems smoother, no return of misfires yet.
Mine was always P0308, lean on bank 2 (drivers side LHD), and most recently cam over retarded. And evap P0455.
Im really convinced it was the issue.
AudiWorld Member
Joined: Jun 2019
Posts: 51
Likes: 5
From: Vermont
Until now.
Headed back up my road (10% grade) did it again, flashing CEL and thunk thunk thunk, like a slip catch feeling...
As soon as i was not under so much load, all gone, no light, all smooth.
I am under half tank, part of me still thinks it might be part of it, but it has happened other times too.
Headed back up my road (10% grade) did it again, flashing CEL and thunk thunk thunk, like a slip catch feeling...
As soon as i was not under so much load, all gone, no light, all smooth.
I am under half tank, part of me still thinks it might be part of it, but it has happened other times too.
AudiWorld Senior Member
Joined: Jan 2004
Posts: 680
Likes: 9
From: Nor Cal
A flashing CEL indicates an active misfire. Any way to check the CATs on that side? Maybe obstructed. Also, check the cowl area for water shorting wires in the ECU.
There is always the fuel pump, but I cannot recall if it throws codes while in the throes of death. I think not. Anyone know better?
There is always the fuel pump, but I cannot recall if it throws codes while in the throes of death. I think not. Anyone know better?
AudiWorld Member
Joined: Jun 2019
Posts: 51
Likes: 5
From: Vermont
I'm kind of resigned to a mechanical failure as the problem comes and goes and it's so sporadic to that the vehicle will operate through all Throttle ranges normally and then this just happens. Mechanical failure like a clogged cat won't unclog itself for a little while and then come back to being clogged again in my opinion. Its also so random, i camt leave vcds hooked up all the time in hopes i catch it.
It seems with my car, I don't mean to hijack This Thread, but every little thing I do seems to make it just a little bit better from changing the valve cover gaskets, to cleaning the PCV, little things.
It seems with my car, I don't mean to hijack This Thread, but every little thing I do seems to make it just a little bit better from changing the valve cover gaskets, to cleaning the PCV, little things.
AudiWorld Junior Member
Joined: Jul 2023
Posts: 17
Likes: 5
I'm kind of resigned to a mechanical failure as the problem comes and goes and it's so sporadic to that the vehicle will operate through all Throttle ranges normally and then this just happens. Mechanical failure like a clogged cat won't unclog itself for a little while and then come back to being clogged again in my opinion. Its also so random, i camt leave vcds hooked up all the time in hopes i catch it.
It seems with my car, I don't mean to hijack This Thread, but every little thing I do seems to make it just a little bit better from changing the valve cover gaskets, to cleaning the PCV, little things.
It seems with my car, I don't mean to hijack This Thread, but every little thing I do seems to make it just a little bit better from changing the valve cover gaskets, to cleaning the PCV, little things.
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