The Nissan Quest Spark Plug Wire is the automotive component responsible for carrying the high voltage current from the ignition coil or distributor to each spark plug, creating the spark to ignite the air-fuel mixture in the cylinders. The conductive core, wrapped in silicone or EPDM insulation and reinforced by fiberglass, is protected by an outer sheath so that this Nissan Quest Spark Plug Wire is resistant to heat and abrasion. In the Nissan Quest ignition system, a Spark Plug Wire's metal terminals under molded boots clip on one end to the spark plug and on the other to the distributor cap tower or ignition coil. In other words, the terminals provide a continuous electrical path between the cap and the plug. To minimize electromagnetic and radio interference, the Spark Plug Wire uses either a carbon impregnated core, a spiral wound alloy core, or a fixed resistor design, which is selected to limit interference while delivering adequate voltage. The Spark Plug Wire in the Nissan Quest will need replacing for dependable operation if its insulation cracks or resistance increases due to age, heat, or vibration. The symptoms of a bad Spark Plug Wire are hard starting, misfire, rough idle, sluggish acceleration, and reduced fuel economy.
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