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Grey smoke from exhaust

Tiny
MANUEL RENTERIA
  • MEMBER
  • 1985 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 89,000 MILES
How do I stop it? Plugs are fouling out.
Sunday, October 6th, 2019 AT 3:50 PM

2 Replies

Tiny
94 TRANSAM
  • MECHANIC
  • 680 POSTS
Hi and welcome.

Gray or white smoke is caused by burning oil. The 3 main causes are:

1: Worn out piston rings. (Rebuild motor)
2: Worn out valve guides. (Replace guides or whole head)
3: A cracked engine block.

Are all 8 plugs fouling out or are some okay?

Rich
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Sunday, October 6th, 2019 AT 4:39 PM
Tiny
AL514
  • MECHANIC
  • 4,692 POSTS
Are the plugs coming out wet when you check them? The engine could be running very rich, fouling out plugs. Especially considering how old the vehicle is.
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Sunday, October 6th, 2019 AT 7:38 PM

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