The Spark Plug Wire of the Nissan Xterra transmits high voltage generated by the ignition coil or distributor to each individual spark plug to ignite the air fuel mixture within the engine cylinders. A conductive core encapsulated by silicone and EPDM insulation serves as the main component of each Spark Plug Wire. A layer of fiberglass insulation in between and the outer jacket made of an external heat-resistant polyester provide the wires with durability. The ignition source and the plug are connected to metal terminals at both ends and molded boots for protection. As currents pass through a conductor, a magnetic field forms. The Spark Plug Wire suppression construction uses carbon, spiral core, or fixed resistor construction to limit EMI and RFI interference with electronics. The Spark Plug Wire set for each Nissan Xterra engine with a distributor or coil pack is designed to size only the right amount of slack. The resistance or insulation of the wires may be raised or cracked due to heat, aging, mechanical abrasion, and contact with chemical substances. A deteriorated Spark Plug Wire may cause hard starting, misfire, rough idling, and reduced performance. It is important to periodically renew a badly worn Spark Plug Wire for proper continued operation of the Nissan Xterra. Each Xterra's ignition depends on the performance of this component.
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