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Spark Plug Fouling
Usually there are two main causes of spark plug fouling:
- The engine is worn, and loose fitting parts allow engine lubricating oil to get into the combustion chambers [cylinders]. The oil then gets onto the spark plugs, and is "cooked" on.
- Another possibility is that the fuel mixture is way too "rich," causing incomplete combustion which deposits carbon and lacquer on the plug tip.
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