GM Top End Cleaner?
Black sooty coating usually indicitative of rich fuel burn. Find a shop that has an analyzer probe they put up the exaust to measure emissions and that'll tell you for sure. Maybe go to Advance Auto and ask them to pull codes and see if something in the throttle body or ECU is amiss. If the black soot has some oilyness to it could mean oil getting is into the exhaust.
Nate
Black sooty coating usually indicitative of rich fuel burn. Find a shop that has an analyzer probe they put up the exaust to measure emissions and that'll tell you for sure. Maybe go to Advance Auto and ask them to pull codes and see if something in the throttle body or ECU is amiss. If the black soot has some oilyness to it could mean oil getting is into the exhaust.
The Best V8 Stories One Small Block at Time



