Grey smoke from exhaust

1985 CHEVROLET SILVERADO
89,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC
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MANUEL RENTERIA
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  • 1 POST
How do i stop it? Plugs are fouling out.
Oct 6, 2019 at 3:50 PM
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94 TRANSAM
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  • 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
Oct 6, 2019 at 4:39 PM
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AL514
  • CERTIFIED EXPERT
  • 5,465 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.
Oct 6, 2019 at 7:38 PM
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