2 Remove the spark plugs and inspect the threads. Common Visual Signs Thick, black oil coating on the plug's ceramic insulator and metal base.
How to Remove Oil from Spark Plug Threads Effectively
Shiny, hardened oil deposits around the plug well's opening. Assess the level of fouling and check for cross-threading.
This specific issue indicates a breach in the combustion chamber's seal, allowing pressurized gases to force past the threads and pull engine oil along the path. The oil fouls the spark plug, drastically reducing its ability to generate a spark.
How to Remove Oil from Spark Plug Threads
This is often accompanied by a distinct smell of burning oil when the engine is running and may present as a rough idle or misfire due to the insulating effect of the oil on the spark plug's electrode. Identifying the Problem Diagnosis begins with a visual inspection of the spark plug well.
More About Oil on spark plug threads
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