1990 Ford Bronco 5.0L engine

1990 FORD BRONCO
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NASHOLMM
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  • 2 POSTS
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
Jun 16, 2007 at 12:45 PM
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INDYUKE
  • ✓ASE Certified Mechanic
  • 416 POSTS
  • ASE Certified Mechanic
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.
Jul 13, 2007 at 1:51 AM
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