Running rich or oxygen sensor

[Cyborg]

Hi All,

CTT arrived couple of days ago, 957 2008..car running ok but noticed exhaust is black, could it be fuel quality or oxygen sensors? No warning lights on..any suggestions or solutions will be appreciated.

[mudman2]

you mean the tips are black or there is black smoke coming out of the exhaust ? How many miles ?

[Cyborg]

Tips are black no smoke, 40k....been in transit 8 weeks + so will take it for a long run.

[hahnmgh63]

They tend to run a little rich, especially if your into the boost (which at that point is a good thing). If it is actually rich it could be the O2's, could also be the engine temp sensor thinking it is cold. A few other possibilities too so the best thing is to run a scan, Durametric or other. Since it would be an Emissions code, any good scanner should give you a start.