TFSI Misfire

[Chrismawa]

I have a misfire on my car at idle and not sure whats causing it. It doesnt seem to be present or effecting the drive but you can here it at idle.

I have changed the following:

Spark plugs
Coil packs
PCV

Changing these has made a difference but its till there. I have scanned with VCDS and it is showing a misfire code. I was going to try cleaning the MAF. Not sure if this would have any difference? Any help would be great. Cheers.

 

[Chrismawa]

Anyone any ideas or had a similar problem?

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[Ricky Burrows]

injectors?

 

[Chrismawa]

injectors?

How do I check if it's them? Vcds?

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[Ricky Burrows]

I cant remember what my local Audi specialist did I think he looked with a camera possibly and seen fuel where it shouldn't be either way he come to the conclusion and advised its more than likely an injector (which is was), not sure if vcds points directly towards an injector but I'm sure it will give you a better idea, my symptom's were a lot worse that yours but I guess that depends how faulty it is, if it is that, either way worth looking into.

 

[Ricky Burrows]

If you changed everything else then its a pain but your have to remove them all and have them tested which may be hard given the circumstances at the minute, obviously places are open but if its the same as where I live everyone is massively busy and have long booking in times.

 

[Chrismawa]

VCDS is reporting Cylinder 2 as having the misfire. I swapped round the coilpacks to be sure its not a dud and the issue still stays on Cylinder 2. I've tried disconnecting the MAF and that makes no difference. And also carried out a Throttle Position reset as was suggested elsewhere with no change.

The misfire only seems to be present on idle and not when under load as shown below. I'm thinking now it is the injector.

 

[Ricky Burrows]

Glad you got to the bottom of it mate.

 

[Chrismawa]

Thanks mate. Got a new set of injectors to go in and going to clean up the valves a bit while im there.