No compression in cylinder six

1992 MERCURY MARQUIS
160,000 MILES • 4.6L • V8 • AUTOMATIC
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WESTRUCK
  • MEMBER
  • 55 POSTS
Clean intake plum from carbon deposits. Is possible for carbon to break off while cleaning and wedge the intake valve and exhaust? There is no compression cylinder six.
Oct 10, 2019 at 8:23 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good evening,

Yes, it is very possible. A piece could be preventing the valve from closing.

I would remove the valve cover and look and see if one of the valves is partially open. If it is, push the valve down and see if the carbon drops into the cylinder.

Roy
Oct 10, 2019 at 8:36 AM
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