White smoke from exhaust

2004 CADILLAC DEVILLE
200,000 MILES • 4.8L • V8 • FWD • AUTOMATIC
Avatar
LIFE OF CADDY
  • MEMBER
  • 1 POST
When I start my car, once it gets to operating temperature, white smoke starts coming from my tail pipe continuously, and if I press the gas the white smoke gets cloudier, I was thinking head gasket but the car doesn't overheat at all. I am not losing any coolant, no milky oil, car is even drivable, except it is not because of the white exhaust smoke. so i am clueless as to what it could be, I been doing some "research" and heard it could be a bad fuel injector, could that be the problem, I do get a P0300 once diagnosed, is the the code for a bad injector? It is driving me nuts. I do not want to get a head gasket repair if it is not the gasket. I even did the "engine block test" and fluid did not turn yellow, it stayed blue. could it be that my even is just completely done? I hope that is not the case.
May 15, 2017 at 12:42 AM
Advertisement
Avatar
STEVE W.
  • CERTIFIED EXPERT
  • 15,113 POSTS
White smoke is usually coolant, especially if it smells slightly sweet. I would bet it is a bad head gasket but it might be just starting to fail and acting like a check valve so it draws in coolant but then closes off real good so you get no combustion gas returning, or just a small amount. I would try a pressure test on the cooling system, and pull the plugs and look inside to see if there is a steam cleaned cylinder or two.
May 15, 2017 at 4:46 AM