Spark Plug Tester Tool For Engine Ignition System. Replacing old, worn spark plugs restores lost horsepower, improves fuel efficiency, and eliminates hesitation or rough idling in aging engines. Spark plugs deliver the ignition spark that ignites the fuel-air mixture in each cylinder, providing efficient combustion for smooth engine operation. Fine-wire electrodes with sharp points require lower voltage for spark initiation, enabling easier cold starts and reliable ignition in damp conditions Helps reduce fuel consumption and emissions
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