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Not sure if that's the right name for it, but is there something like this on the car that can go bad? The guy that was working on my flywheel noticed that there's some kind of buildup on the inside of my exhaust, near the cat converter, and he said something isn't right with my air-fuel ratios.

Mike
 

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I don't know about the sensor, but my car has always run very rich. I can't explain why, but it does. I am going to get the SAFC pretty soon to fix this... I thought it was only my car for some reason, but maybe it is set from the factory to do this! Every time I have ever checked my plugs, they are covered in black soot. I can clean them and five minutes later they are all black again!
 
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