2006 Chevy Monte Carlo dirty exhaust

MATTYGUSCG

MEMBER
2006 CHEVROLET MONTE CARLO
V8
FWD
AUTOMATIC
42,000 MILES

I have an 06 monte carlo ss 5.3/ls4 and have noticed a little black residue inside my exhaust pipe tips, is there any concern, thank you, matt

Thursday, August 27th, 2009 AT 9:54 AM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Could be running rich get it check on a gas analyzer to confirm it. Running rich could be caused by the following a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.