Misfire detected DTC

[Quattrodave]

Morning all,

Two days ago I had a very rough and not happy A8 (4.2 FSI). On pulling the codes I got P0024 - B Camshaft position timing over advanced - Bank 2. It also stated misfire on cylinders 5, 6, & 8.

I had only just left home so quickly turned around and headed back. After a few restarts the engine ticked over fine, I cleared and then reran the codes and all came up clean so off I went, 15 or so miles no problem.

Then last night it came back again, only this time misfire on cylinder 8 only and P0024.

Same this morning. rough as hell at idle but revs fine, no lumpyness or such when under way. There's a lot of clicking coming from the passenger footwell too, relay/solenoid type clicking - presuming these are linked?

In peoples experience would the above suggest that the camshaft solenoid in bank 2 need replacing, if so, how much are they and is it a diy job?

Thanks

[Mechcanico Lee]

Yes could be sticky timing control solenoid , if its staying open which will advance the cam this would cause rough running on one bank of cylinders like the fault codes were backing up .

With vcds go into solenoid activations ,there will be 4 i think on that engine , listen for a positive click from each sol. ....its not very loud just like a light clicking sound

I had similar on audi TT , in some cases an engine flushing agent and oil change may just un stick the build up in the actuator body.

Forte do a good engine flush , you havent lost anything if it doesnt work ,just gained a cleaner engine , if it doesnt work yes looks like replacement of the solenoid is first port of call .

[Quattrodave]

Originally Posted by Mechcanico Lee

Yes could be sticky timing control solenoid , if its staying open which will advance the cam this would cause rough running on one bank of cylinders like the fault codes were backing up .

With vcds go into solenoid activations ,there will be 4 i think on that engine , listen for a positive click from each sol. ....its not very loud just like a light clicking sound

I had similar on audi TT , in some cases an engine flushing agent and oil change may just un stick the build up in the actuator body.

Forte do a good engine flush , you havent lost anything if it doesnt work ,just gained a cleaner engine , if it doesnt work yes looks like replacement of the solenoid is first port of call .

Took it to a local garage (new to me as my usual one is busy til next week) and they've suggested new coil packs for the three that are misfiring and then go from there.

My question is would a solenoid in need of replacement cause three cylinders on one bank to misfire or do they genuinely need coil packs?

Car was under audi extended warranty until April this year so I would have hoped everything done until that point was top notch?!

[Norretal]

Originally Posted by Quattrodave

Car was under audi extended warranty until April this year so I would have hoped everything done until that point was top notch?!

Not necessarily, I refer you to this can of worms below..........

http://forum.a8parts.co.uk/showthread.php?t=10436

Hope it's an easy, cheap fix for you. I personally would wait for a second opinion before buying coil packs, surely their diagnostics would have given them more information to go on than that? Sounds very much like some clutching of straws going on, unless of course they gave specifics as to why they are suggesting coil packs?

[Quattrodave]

Originally Posted by Norretal

Not necessarily, I refer you to this can of worms below..........

http://forum.a8parts.co.uk/showthread.php?t=10436

Hope it's an easy, cheap fix for you. I personally would wait for a second opinion before buying coil packs, surely their diagnostics would have given them more information to go on than that? Sounds very much like some clutching of straws going on, unless of course they gave specifics as to why they are suggesting coil packs?

They did full diagnostics using auto com

They mentioned new coil packs due to

P0305
P0306

P0308 fault codes all saying misfire detected - permanent

[Norretal]

Originally Posted by Quattrodave

They did full diagnostics using auto com

They mentioned new coil packs due to

P0305
P0306

P0308 fault codes all saying misfire detected - permanent

Fair enough, they're responding to the codes they've viewed then. My concern was that I had a "shudder / misfire" at low revs on my D2 and was convinced it was the gearbox as it shook the car, turned out to be electronic and caused by fouled lambda sensors due to it not being driven enough.

Hope you get sorted, there are plenty of helpful people on here that can advise better than me

[Quattrodave]

Three coil packs replaced (all on same bank) and all seems well with the car so far. Cam adjuster code hasn't resurfaced so hoping all is good.

[Mechcanico Lee]

3 coils all at once !! Never would of thought ...

[Quattrodave]

Originally Posted by Mechcanico Lee

3 coils all at once !! Never would of thought ...

Proper weird huh!

Especially as it came up with two on Sunday (6&8) then after resetting codes and restarting a few times the car ran fine for another 20 or so miles, then when it came back 5,6,8 went down!

Ho hum, here's to hoping nothing more comes up!

[mannyo]

Last year when a coilpack went down on my 3.7MPI, after a quick phone call to Poole Audi all eight were replaced free of charge the following day.

Mine were FOC because my 2004 had missed a replacement campaign, I wonder if there was similar for the FSI engine.