The oil fouls the spark plug, drastically reducing its ability to generate a spark. Step-by-Step Diagnosis Step Action Finding 1 Clean the area around the valve cover and spark plug wells.
Inspecting Oil-Fouled Spark Plug Threads for Accurate Diagnosis
This pressurized gas forces oil down the dipstick tube and into the valve cover, creating excessive pressure that forces oil past the spark plug seals. Assess the level of fouling and check for cross-threading.
2 Remove the spark plugs and inspect the threads. 3 Pressurize the cooling system or perform a leak-down test.
Inspecting Oil-Fouled Spark Plug Threads for Contamination and Damage
Replacing just the spark plugs without addressing the leak is a temporary fix that will result in immediate contamination of the new plugs. A thorough top-end inspection is necessary to differentiate between external gasket failure and internal mechanical wear.
More About Oil on spark plug threads
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