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Spark Plugs and Wires
Ford Explorer Sport
Ford Explorer XLT

What are some possible causes of oil fouled spark plugs?


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2014-07-03 19:56:41
2014-07-03 19:56:41

The culprit is oil collecting in the cylinder and not being burnt off. Generally it is caused by 1) leaky valve seals, 2) worn rings, 3) leaking head gasket.

The first check should be a compression test to verify if the rings or heads are leaking. If they are fine the only thing left is the valve seals. Not an easy fix but can be done by a home mechanic with some effort.

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Fouling spark plugs can happen when the tip temperature is insufficient to burn off carbon, fuel, oil or other deposits and causes spark to leach to metal shell...no spark across plug gap will cause a misfire. Wet-fouled spark plugs must be changed as they won't fire. Dry-fouled spark plugs can sometimes be successfully cleaned by bringing the engine up to the operating temp.

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Wear. Fouled. Cracked.

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Faulty/fouled spark plugs or spark plug wires. I had this problem and a set of new wires fix it.

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if the spark plugs are black because your car is running too rich. your plugs are fouled.

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possible fouled spark plugs, bad fuel. check both and if both are good, get back to me.


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