So ive got black smoke coming out of the tailpipe only under WOT (car has 237k miles) Ive searched around and people say that its running rich or my 02 sensor. id like to think its running rich. i did a leakdown and compression test and all the numbers were good. do i need to have the gsr tuned with a i,h,testpipe, exhaust? nobody did a followup on the black smoke issue in other threads i read so thats why i was wondering.

 

could be id give it a tune, you never know whats goes wrong after 237k miles... any CEL's? i see this allot on the imports over here that street race them and Rev to high and such or mis shift at high RPM, but if you did a leak test couldnt be your head gasket of anything... you could just replace the o2 censor and get that checked and out the way .... get a haines book at discount or advance auto's

 

no CEL anywhere. well if i have to replace the 02 sensor ill do it later. im still getting really good gas mileage lol

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LickyMYwalker &raquo;</TD></TR><TR><TD CLASS="quote">Black Smoke: Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Another term for excess fuel is "running rich." Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm. Excess fuel will usually effect engine performance, reduce fuel economy, and produce a fuel odor.

How did the fuel get into the cylinder in the first place? Some of the causes of excess fuel are a carburetor that is out of adjustment, a faulty fuel pump, a leaky fuel injector, or a faulty engine computer or computer sensor. If black smoke is present, check the engine oil as in the white smoke example to make sure excess fuel has not contaminated it. Do not start the engine if a heavy, raw fuel smell can be detected in the engine oil. Call your mechanic and advise him of what you have found.

I hope this helps you determine what could be causing your engine smoke, and the possible reasons behind the smoke.

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theres your answer above!

 

thanks. maybe im just running rich. these cars do tend to do that from the factory.