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P6. Why is the firing end apperance of a spark plug important ? Because the spark plug ignition end appearance will show if the spark plug is appropriate or not and the engine condition. The spark plug is an important diagnostic element of the engine, therefore it is the only component of the Combustion Chamber of easy removal. |
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NOTE
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The border line between the dirty areas and the optimized functionning (450c) is called spark plug selfcleaning temperature. |
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