Multiple Cylinder Misfires

[boiseauctioneer]

I am having issues with my V10 S8 having misfire issues in random cylinders. This has happened on 3 separate occasions. 2 of which involved multiple cylinders and 1 that involved a single cylinder.

Each time the car ran perfectly fine right after clearing the codes, I have ran 2 sea foam treatments and even changed my plugs.

Today I took it into Audi to have it inspected for possible carbon cleaning and was informed that it was not required. Any ideas on where to point now?

[Allrad]

Please let us know what they find. I am thinking of picking up a V10 S8 and while there is allot of info on the FSI carbon buildup on the RS4 motors there is not much on the 5.2L.

[boiseauctioneer]

Please let us know what they find. I am thinking of picking up a V10 S8 and while there is allot of info on the FSI carbon buildup on the RS4 motors there is not much on the 5.2L.

I was told there were no carbon issues, going to take it into the dealership the next time that I have a misfire and have them diagnose it.

[Cobra Commander]

Did all these occur at a cold start (after sitting for lengthy time)?

[boiseauctioneer]

Not all no, some did however I have had a couple in the middle of road trips while driving in excess of 2 hours prior to it happening.

[Lazydog]

Who told you there was no carbon issue and how did they come to that conclusion? I had the same thing happen with my S6 v10 and it was a carbon issue that they needed to clean.

My issue with my S6 (http://www.audizine.com/forum/showthread.php/501032-Carbon-build-up-on-my-S6)

[boiseauctioneer]

This was the dealership and after they inspected the motor with a scope.

[boiseauctioneer]

after viewing your thread it looks like the carbon is hard to distinguish. if this problem persists I might insist on it.