regent wrote:Running rich when warm may be a good indication of a faulty ECT sensor signal.

I'll be sure to check that out the next time I get a chance.

draser wrote:What I'm reading is that car runs ok up until warms up. It sounds like the engine continues to run rich after warm up, which jives with your black and soothy plugs.

It just started doing this the day before posting. Never had any issues with it prior.

Hello all. I do apologize if this exists elsewhere in the forums. I did try to search for something similar, but have not yielded any results as of yet. Anyway, on to my problem(s). I bought my 2004 S60 2.5T FWD within the last 4 months. Has been running strong. I've put on approximately 5,000 miles...