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1990 Ford Bronco 5.0L engine

Tiny
NASHOLMM
  • MEMBER
  • 1990 FORD BRONCO
I have oil smoke blowing out of oil fill breather tube going to air cleaner. #7 spark plug is getting a dark brown in color. All other plugs are coming out clean and white. I suspect #7 cylinder is the problem any sugestions on what could be wrong. Am hoping for a simple fix.

Thanks Michael
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Saturday, June 16th, 2007 AT 12:45 PM

1 Reply

Tiny
INDYUKE
  • MECHANIC
  • 416 POSTS
Do a cylinder leak down test. That will give you a good indication of whether or not your rings are bad. That's what it sounds like.

You can also stick a borescope in there and see if the cylinder walls are scored badly or if you have a cracked piston.
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Friday, July 13th, 2007 AT 1:51 AM

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