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2025
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The Role of Spark Plug Caps
Author:
The spark plug cap (ignition coil boot) is a critical component that connects the ignition coil to the spark plug, serving several key functions:
Conducting high-voltage electricity
Located between the ignition coil and the spark plug, it is made from high-temperature-resistant materials such as silicone or rubber, serving to conduct high-voltage current to the spark plug and ensuring efficient release of ignition energy.
Protect the engine
Prevent liquids such as fuel and lubricants from leaking into the engine compartment to avoid corrosion or short circuits in the spark plugs, while also mitigating the risk of electrical current leakage.
Maintain stable engine operation
If the spark plug cap is aged or damaged (e.g., cracked or leaking electricity), it can lead to issues such as difficulty starting the vehicle or rough idling, so it’s important to inspect and replace it promptly.
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