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  • Emissions and Exhaust Systems
  • EGR Systems
  • 1995-2005 Chevy Cavaliers

What would cause black gunk to come out of the tailpipe?

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βˆ™ 2005-11-04 15:48:00

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Could be too much fuel being burned. Gunk is building up, and when the engine is reved, the build-up is forced out. I have the same problem, and black spots all over the wall in my garage. Running rich sounds right. Best to get it fixed before you develop converter problems. Your fuel economy will improve dramatically. Do you have a check engine light on? If so, get the code read to you, and it's possible that you have a bad 02 sensor, I had the same thing with my 96 Explorer, replaced the 02 sensor. A few minutes after replacing the 02 sensor, I blew the rest of the carbon out of the exhaust, and havent seen it since.

2005-11-04 15:48:00
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