View Full Version : Smoke out exhaust


99silverssm6
08-08-2011, 10:31 PM
Hey guys just got a another ss its a 1999 ss with 57k m6 it has long tube headers no cats no egr and a bad 02 sensor and never had the ecu programed I did a tune up plugs, fuel filter and mobile 1syn 5-20 and now I got smoke coming out of the exhaust now it's a good amount and never did it before tune up and I have one cylinder that is carbon and wet and wasn't like this before tune up all the other cyclinders are perfect plz help

99peweterls1
08-08-2011, 10:37 PM
valve seals possibly?

99silverssm6
08-08-2011, 10:46 PM
Could my oil be to thin

godspeed01
08-09-2011, 12:36 AM
i get smoke if i over fill when i race.

BStowers023
08-09-2011, 03:24 AM
im guessing somewhere in your valvetrain...pull your valve covers and check everything in their visually first

Posi
08-09-2011, 02:19 PM
What color is the smoke?

Black - Unburnt fuel. Probably valvetrain.
White - Water/Antifreeze. Probably head gasket. Check oil to see if your mixing.
Blue - Engine Oil. Bad piston rings, gaskets, or seals.

camaro1998
09-01-2011, 09:45 PM
try sea foaming it, my camaro would smoke after hitting the gas and stopped doing it after i had seafoamed it.

brianw401
09-01-2011, 10:40 PM
YOUR OIL IS TOO THIN. The oil control ring package on these cars is terrible & they were typically set up loose from the factory. Change it to mobil 10w40 synthetic or equivalent. I did & my car quit smoking. Plus, you don't have cats to help burn off excess exhaust emissions. If the thicker oil doesn't help, get a catch can to help filter the excess oil from the intake charge. The pcv systems on these cars sucks balls! A lot of oil always gets pulled through the system, into the intake, & down to the combustion chambers where it then burns off & smokes out the exhaust. My Z06 was a terrible oil burner until I took these steps. It only had 31,000 miles on it at the time. After all this, definitely sea foam it to clean up your combustion chambers. The one cylinder that is worse than the others probably has excess carbon build up on the rings. The sea foam will help it. Good luck!