Farmer125

I just purchased an 06 A4 Quattro 2.0 TFSI with 103K miles. Started getting a couple misfires under load. I changed out the plugs since it was a misfire on cylinder 3 from the CEL code. Problem continued, so I changed the coils as well, at that time I also changed out the cam follower as I know that is a known issue. Car is still showing the same issues. I have now replaced the coils, plugs, and cam follower. Any advice on what I cam try next would be greatly appreciated!

vce1232000

vcds scan it. get code and then post. Also do a compression test. possible needs valves carbon cleaned

Farmer125

The last code I pulled was a P0303. I will pull the recent code tomorrow morning. Would the valves have heavy carbon deposits cause misfires? Because the only other things I could think of would be clogged injector(s), worn intake cam, or HPFP needs to be replaced due to previous cam follower issues before I acquired the car.

vce1232000

P0303 is a generic code. Use a vcds(vag-com) for more accuracy. Also you mite need to performance log to see the data in whats the problem.
Yes. heavy carbon deposits on the valves can cause a misfire.

Nasserk

Hi Farmer125, any luck finding the problem of the misfiring. I had the same issue with misfiring on my 2006 A4 2.0T with the same MIL code that you had. At first, a 3 months ago I changed #3 coils but it did not fix the problem completely so checked all spark plugs and there were good, the last guy who owned this car had miss matched the coils and when I went to the dealership 2 days ago to change the rest of the coils and buy 3 more. I was told that Audi had came up with a new coil part that superseded the last one, and was told thats you can't miss match them, that would lead to misfiring agin. So I bough all 4 coils. Now there is no codes.
BUT, when I punch the car at a low RPM I can hear a random pops or I would say a small expulsion and it sound like coming form the passenger said where the turbo is located. Can anyone shad some light on to why this is happing. when I gun it at 3k RPM it will not pops or fires.