1990 GMC 1500 4x4 4.3 V6

1990 GMC C1500
Avatar
BIGDONSCHEVY
  • MEMBER
  • 1 POST
My truck is releasing white smoke from the exhaust. Its very light. The truck is running great. I recently replaced the flywheel, rear main seal, and the front and rear transmission seal. Also did a full tune-up. The smoking just starting a few days ago. I am hoping the motor is not burning oil. The truck did not pass emissions test and I was instructed to get a new catalytic converter. What do you think may be causing the truck to smoke. Thanks
Aug 19, 2007 at 8:54 PM
Advertisement
Avatar
DANIMALGMC
  • MEMBER
  • 33 POSTS
White smoke is a sign of moisture.
Blue smoke is oil.
You might have a head gasket starting to go.

Good Luck
Aug 21, 2007 at 11:55 AM