1. Incorrect Spark Plug Heat Range: If the spark plug is too hot for the engine, the porcelain insulator can become overheated and cause a white buildup.
2. Lean Fuel Mixture: A lean fuel mixture (excessive air) can cause the spark plug to run hotter and produce a white deposit.
3. Coolant or Oil Leak: A leak in the cylinder head gasket, valve seals, or piston rings can allow coolant or oil to enter the combustion chamber, resulting in a white buildup on the spark plug.
4. Electrical Issues: Faulty ignition components, such as a weak ignition coil or worn spark plug wires, can cause the spark plug to misfire, leading to a white buildup.
To determine the exact cause of the white buildup on a spark plug, it's important to perform a thorough inspection of the ignition system and engine. This may include checking the spark plug gap, fuel injector performance, and cylinder compression.
