Oil in spark plug cylinder 4 - jeep liberty 2006 3.7

ioniamichael

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Hi friends, about three days ago my engine started to jerk.
After a computer check, I discovered that cylinder number 4 was fake.
I took out the plug of that cylinder and it was full of oil.
I replaced the plug, cleaned the area with carburetor spray and the problem went away in 3 days.
Today the problem is back again in the same plug, again full of oil.
At first I thought maybe the gasket problem was covering valves, but then I found out that the plug does not go through it, but goes directly to the engine head.
Ideas What else can make this happen?
 

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lfhoward

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That is unburned oil, so not from the combustion chamber. You have a leaky seal at the valve cover. Oil on the plug can cause electrical issues with the ignition coils and lead to misfires. Read more here:

 

ioniamichael

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The problem was with a water pipe passing over the coil of cylinder number 4. The water drip into the coil and go down to the spark plug. The pipe has been replaced and the problem does not return =]
 

Johnny O

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That is unburned oil, so not from the combustion chamber. You have a leaky seal at the valve cover. Oil on the plug can cause electrical issues with the ignition coils and lead to misfires. Read more here:

Yep.
 

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