Atomic1

How much soot is normal to have in the exhaust system? The insides of my exhaust piping is black with soot. It's not a very thick layer, I dont blow black smoke, and my mileage is great....so I'm trying to figure out if this is normal or not.

The o2 sensors are not coated in black, and actually have a light white coating.


stock b16 with 140,000mi

azandford

i had black soot around my exhaust but i was also runnin a bit rich at the time

98civdx

inside of my muffler/tip is black but it runs great so i wouldnt worry to much about it at all.

Atomic1

I have a stock setup with new o2 sensors. What other things would cause me to run rich?


PS, I keep getting p0420 codes even after new cat.

bsmith100

Soot? What did you swap your engine for a diesel?

I am only kidding. A small amount of soot in the tip of the muffler is normal. Wash your car more often and remember to blast the inside of the muffler tip with water. It will wash right off.