Crack on Spark Plugs

Bad Ignition coil , wet Spark Plugs , wrong Spark Plugs can result in thermal crack on the ceramic body of the spark plug.

On some severe engine health issue like water or oil seepage thru the engine head resulting in Engine knocking (Detonation); raising the temperature of the combustion may also overheat the center electrode of the spark plugs casing it to expand and crack the surrounding ceramic insulation .

Broken Impulse/ Flywheel Speed Sensor
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Crack on Spark Plugs
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