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Black Ring on Exhaust

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Old 07-09-2012, 03:53 AM
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Default Black Ring on Exhaust
Title says it. The ring is on the tip of the exhaust, and before recently the ring wasnt there. what could cause this?
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Old 07-09-2012, 04:57 AM
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Did you just put on a new exhaust tip?
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Old 07-09-2012, 08:59 AM
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it's most likely carbon build-up from running rich

could be an O2 sensor going
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Old 07-09-2012, 11:16 AM
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Its the original tip

the 02 sensor is new. got all new sensors when the engine was rebuilt....ive read that clogged injectors could cause this...??
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Old 07-09-2012, 11:37 AM
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A pic would be worth 1K words.....r u talking on the outside????....they're all black on the inside.
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Old 07-09-2012, 11:44 AM
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Normal, don't worry about it.
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Old 07-09-2012, 12:22 PM
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Like this?
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Old 07-11-2012, 04:14 PM
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Originally Posted by Bbasso
Like this?
Like this.
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Old 07-11-2012, 04:49 PM
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Huh. Mine doesn't have it. Anyway, it's never a bad idea to check that tiny, brittle little tube to the MAP sensor.
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Old 07-11-2012, 04:52 PM
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Mine has the same ring but i guess i never thought about it being a problem...
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Old 07-11-2012, 04:57 PM
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mine has always been clean till oh say the last week when I noticed an exhaust leak and see that my catalytic converter is rattling and leaking exhaust at the joint with the muffler. That area also has black residue.
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Old 07-11-2012, 05:12 PM
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Originally Posted by JwL89XJ
mine has always been clean till oh say the last week when I noticed an exhaust leak and see that my catalytic converter is rattling and leaking exhaust at the joint with the muffler. That area also has black residue.
Ill check mine for that.
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