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Old 02-16-2009, 02:53 PM   #1
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Wink Burning Rich - Black soot coming out tailpipe

The engine is buringing so rich that soot comes out tailpipe and leaves a black soot mark on garage floor. The soot is easily wiped away like black powder. My engine is LT1, stroked to 383 w/ powerdyne supercharger.

Whats weird is that i started engine up the other day and soot no longer came out the tailpipe. I shut engine down restarted and here comes the soot. The soot coming out the tailpipe has been with me for quite a while but doesn't appear to effect the performance. What can I do to eliminate the problem and what are consequences if I keep driving the car with engine like this. At night if I start racing around and pull over quickly I can see the headers glowing (red, red) through the header wrap.....
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Old 02-16-2009, 03:00 PM   #2
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How old are your O2's and what brand are they?

Another thing could be the tune, but if it didn't do this b/f it could just be the O2's.
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Yep its slow.

Making the world a warmer place one gallon at a time.
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Old 02-16-2009, 03:45 PM   #3
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Wink

have been on engine for 6+ years but the car doesn't get driven that much in all those years maybe 10k miles tops. One of the O2 sensors mounted just after header is really close to firewall and wondeirng if has been damaged after all the gas stomping
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Old 02-16-2009, 03:57 PM   #4
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If you replace it just make sure you don't use Bosch, for some reason these cars don't like those, stick with AC delco.
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Old 02-16-2009, 04:04 PM   #5
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02 was my first thought also. Also check for exhaust leaks before the sensors.
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Old 02-16-2009, 04:59 PM   #6
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I have a one wire O2 sensor also is this normal or is this retrofit from oem.
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Old 02-16-2009, 06:12 PM   #7
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Quote:
Originally Posted by LT1-928 View Post
I have a one wire O2 sensor also is this normal or is this retrofit from oem.

it should be a 4 wire o2
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