Why does its spark plugs full of carbon?Iit.

Tiny
ANONYMOUS
  • MEMBER
  • 1997 NISSAN SENTRA
  • 200,000 MILES
Why does its spark plugs full of carbon?Iit emits black smoke first then white smoke after the engine heats up?
Monday, April 8th, 2013 AT 6:49 PM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Engine is running rich with excessive fuel getting into the cylinders and producing the black smoke.

If smoke is grey, oil is being burnt in cylinders. If it is completely white, you have a head gasket problem and would be having issues with coolant losses and overheating.
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Sunday, April 14th, 2013 AT 10:25 AM

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