Number eight cylinder misfiring water on top of spark plugs

2002 MERCURY MARQUIS
100,000 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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TUNDE LORINCZ
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  • 1 POST
Even though I have found a lot office oily water in the shaft where the number eight cylinder spark-plug is. The engine is not over heating. Neither have I seen a white substance under the oil cap.

No vapor is escaping on the passenger side. Neither have I seen bubbles coming up in side the coolant reservoir.
Maybe I did not drive my car for too long. It does not misfire continuously but intermittently. Sometime is running smooth and the engine line blinks while other times the light is on constant. And. The car looses power in addition of misfiring.
I appreciate your help. I surely hope it is the radiator that can be easily fixed.

What is your opinion?
Jun 15, 2017 at 1:32 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
check compression first see what you have against other cylinders it sounds like something leaking like a head or maybe intake gasket or crack someplace. there should be no water in cylinder even if driven a short distance. you might try cleaning the spark plug or replacing it as well as checking plug wire 5000 ohms per foot and twirl it around while checking .
Jun 15, 2017 at 5:45 AM
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