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With the prolongation of the use time, the high temperature and high heat in the engine working and the rough dismantling methods, such as folding, pulling and bending, may lead to the dismantling of the inner core line of the spark plug and the increase of its own resistance, so that the high voltage power can not be fully transported to the spark plug to "break the fire" or the spark plug. The "jump fire energy" is not enough to ignite the combustible mixture, and the corresponding cylinder can not work or work abnormal, seriously affecting the output of the engine power.