What would cause my L67 3800 to have a cloud of exhaust fume even when it is 80 degrees out? Could this be where the majority of my gas mileage is going?


Asked by Feb 27, 2010 at 10:31 AM about the 2002 Pontiac Bonneville

Question type: Maintenance & Repair

2002 Bonneville SSEi series II L67. There seems to be a lot of carbon residue building around my exhaust  on the bumper. Right now, with the foot out of the pedal it is only getting 21.5 mpg.

1 Answer


If the exhaust fume is black, then that would be the fuel that comes out the tailpipe not burned at all. Leaky fuel injectors could be one of many causes for that.

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