1999 Mercury Cougar There Oil On Two Spark Plugs Really Bad Compression Makes

144,000 MILES
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KENNETHMORROW
  • MEMBER
  • 3 POSTS
Why is there oil on two of my spark plugs has really bad compression and makes a hissing sound
Oct 23, 2012 at 5:26 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
what is compression on all cylinders. It may be a burnt valve or broken piston rign, broken piston.
Oct 24, 2012 at 7:27 AM
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