Failed check today . BITCHK!
Car is running great. BLACK smoke. ....not oil or coolant then. Unburnt fuel looks like the culprit I'm guessing from a quick read. Fuel pump problem? Going to pull fuel pump this wknd to check that and follower. Anyone seen this before? Had PCV already changed out by Audi on warranty. How do I check that....blow thru? I'm thinking it's fuel pump malfunction or PCV? YEA nay? Thoughts? ....thanks