stell1

Came on. Dealer said the code was a "random misfire". Anyone experience this? Anything I should be concerned about? The light has not come back on since. TIA.

Reggie

It seems that the carbon buildup on the intake valves is the culprit - check out this and other forums for stories

stell1

Thanks, I will look into. With only 6,000 miles on the car, I wouldn't think there would be much buildup.

Nicht ein A4

I agree that carbon buildup is a likely cause in this vehicle at this mileage.

bstellar

You would think… but you'd be wrong.

More here: https://www.audiworld.com/forums/sho....php?t=2746852

Sprinty_RS4

Random misfire could be build up as it was done to my car. They cleaned it then of course never fixed the problem. After the third trip it was the TSB on the fuel pressure sensor.

Haven't had a problem since.

stell1

Great, thanks for posting that thread link. Very helpful.

RoninWheels

The carbon buildup on the valves 'issue' is a direct result of the direct injection... there are issues with almost every manufacturer, some more than others. Some have being trying the "walnut shell" method or other chemicals to clean this build-up... with great results.

as for the random misfire faults: as the dealer would do, clear the faults and drive the car.. if the CEL comes on then you'll need some further diag/repair.

i will elaborate more on the chemicals currently used on our porsche vehicles.. and pass the info once available.

_Ryan