
Spark plugs are an integral part of the engine. Each one sends a little high voltage spark between the terminals, which is used to ignite fuel in the engine. When spark plugs fail, this means that your engine will stop running efficiently.
Over time spark plugs can become dirty, picking up a residue from the burned fuel, coating the electrodes with carbon. Additionally, repeated sparking of the metal components can simply wear them down, increasing the distance the spark has to jump between electrodes, requiring additional charge from the battery which is not always available. In short, spark plugs will wear out.
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