2006 Chevy Monte Carlo dirty exhaust

2006 CHEVROLET MONTE CARLO
42,000 MILES • V8 • FWD • AUTOMATIC
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MATTYGUSCG
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  • 1 POST
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
Aug 27, 2009 at 2:54 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 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.
Aug 27, 2009 at 4:41 AM
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