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Bryan1ba 06-08-2013 08:59 AM

Blackish exhaust?
Okay. Noticed paint damage on bumper right above pipes. Put on SS tips last week n noticed ends started blackening a bit, wipes right off of course. What could cause this issue? Engine runs great and didn't notice any water dripping from pipes. Just put in new plugs, wires, etc a couple thousand miles ago.

Grubrunner 06-08-2013 11:07 AM

Commonly known as "exhaust soot" which is the norm. I've always been taught that it's due to Incomplete Combustion

I''ll tell you this about exhaust soot build up on your pipes: One, is clean them whenever you see them visible. A wipe-down with a MF or Terry towel with some GC or AP cleaner is often suffice. Leaving them for any prolonged period before wiping them clean will create a film on your tips over time that need to be polished out.

Two, is after cleaning them [preferably following a wash] apply some clear-coat sealant, wax or an equivalent product on the tips. This will give them a protective film that will make them a LOT easier to clean in between washes.

Not sure what you're saying re: the paint damage.... Did the new pipes cause the paint damage? If so then they're either too close to the bumper's lip and the pipe's heat dissipation is causing the flaking and/or they're not mounted rigidly enough [incorrectly] and the vibration is creating the flaking. Read: They're getting too close to your bumper's lip.

Exhaust tips will generate some serious heat under extreme conditions. This is one major reason why I'm a fan of double-walled tips over the paper-thin single layered.

Good luck.

Bryan1ba 06-08-2013 05:46 PM

Thanks grubrunner. The paint damage happened before tips and I don't think the pipes were far enough out before tips.

Warlock III 06-08-2013 11:07 PM

In addition to what GR said. The soot is unburned fuel (hydrocarbon) and it's usually caused by running too rich. The ECM SHOULD be adjusting for it but it may be an indication that an O2 sensor is on its way out.

Keep that in mind if you start getting a CEL.

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