misfire

[topmech0]

hi all,have 997 MY05 and have misfire codes and check engine light on. if i start car and drive its fine until i come to traffic and idle or low revs for a minute or so then starts to misfire and gets worse,sounding like bag of nails. if i then switch off and restart then problem gone until next time i hit traffic. had it on piwis and says misfire for cylinders 1,2,3 and if leave for longer misfiring then 4 and 6 appear. the problem also clears if i erase DME faults. i have changed all coils,spark plugs and aos but still have issue.

also if i activate camshaft adjustment on piwis when running there seems to be no change in engine revs.

any ideas before start looking deeper?

[PAULSPEED]

How many miles do you have on this car. Sounds like the cam chain

tensioner is not working.

Paul

[Loren]

hi all,have 997 MY05 and have misfire codes and check engine light on. if i start car and drive its fine until i come to traffic and idle or low revs for a minute or so then starts to misfire and gets worse,sounding like bag of nails. if i then switch off and restart then problem gone until next time i hit traffic. had it on piwis and says misfire for cylinders 1,2,3 and if leave for longer misfiring then 4 and 6 appear. the problem also clears if i erase DME faults. i have changed all coils,spark plugs and aos but still have issue.

also if i activate camshaft adjustment on piwis when running there seems to be no change in engine revs.

any ideas before start looking deeper?

Can you give us all the fault codes?

[topmech0]

the car has 54k miles on it. the fault codes are the usual of

P0300 multiple misfire

P0301 cyl 1 misfire

P0302 cyl2 misfire

P0303 cyl 3 misfire

and if i leave it rough running for few minutes more it will then show in addition

P0304 cyl 4 misfire

P0306 cyl 6 misfire

even when left for ages running badly and misfiring and spluttering i have never seen P0305 come up or any other fault related to the suspected variable cam timing solenoid on bank 1.

when i compare the readings of bank 1 and two in actual values of cam adjustment it seems that values on bank 1 seem lazy

hope this helps with your questions?

[brahimza]

I am not sure if this will help, but my car had the same problem, and here are the things that was done, I am not sure which helped, but one did:

Change all coil packs, sometimes they have cracks not visible with eye.

Changed all Plugs

Change oil (Sometimes oil gets a bit old) the cars are very sensitive

Replaced all the lifters ( At any time through life of the car, if bad oil was used, or sat for a while) lifters can get sticky

cleaning the Intake.

Hope you best, it is really frustrating.

Bobby