> I'm leaning towards either the O2 sensor or a faulty DPR. Am I on the > right > track? well, sounds like its running on the rich side, and if the crap in the exhaust is in fact unburnt fuel, you would be correct. if the car has been sitting for a long while, it could actually be oil you are burning, due to leakage past the old/hard valve seals. hth Al