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black stuff from mufflers getting on my rear bumper

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black stuff from mufflers getting on my rear bumper

 
Old 07-20-2001, 07:22 PM
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jparr
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why is this happening it is a black, kinda look like carbon build up is my vette telling sumthing isnt right help i jus changed my plugs, fuel filter,cleaned my TB and jus did a porting on the plenuim. Oh i also caught a spark plug wire arching on to my plenuim i fixed. help me if u can J

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Old 07-20-2001, 07:28 PM
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Willycool
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WELL....Dude the same thing happened to me..check my past postings under Willycool.
What year is your car?
Do you have an IDLE Surging Problem?
EGR working?
Injectors working?
fuel pump working?

Give me some more details and I will try to help you.

Peter
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Old 07-20-2001, 07:55 PM
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89C4L98
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If you have black "stuff" getting on your bumper that isnt cool. I have seen cars with leaking head gaskets emit oil and thats the black stuff you could see. Or you car is running extremely rich. I would do some more testing. Good luck.
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Old 07-20-2001, 08:05 PM
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The black stuff you are describing is carbon from the motor running very rich. Start by verifying that you have no codes. Sometimes the O2 will die causing the car to go to limp home mode, or very rich. Check the FP. I would need details to make a recommendation there. This may cause poor driveability, poor fuel economy, failure of sensors (i.e. O2 sensor), as well as a possibility of washing the plugs and the cylinder walls (in extreme cases) if not fixed. What all did you change at that one time? Are all sensors reconnected. Retrace your steps, check everything. The root cause can be almost anything, but the result is too much fuel, and the end result is the black stuff on the bumper. Probably smells quite rank too.

Aaron
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Old 07-20-2001, 08:09 PM
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I do have a code 36 mas air flow burn off module thats it if this can help
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