Nissan Quest Spark Plug produces the high voltage ignition point that initiates and continues combustion in the van's gasoline engine. The structure of the Spark Plug is such that it can thread into the cylinder head, and the insulated ceramic material that surrounds its central electrode allows it to project into the combustion chamber, forming an accurately calibrated gap with the side electrode. When a voltage is received from the ignition coil around 12,000 to 45,000 volts, the voltage jump occurs across a Spark Plug gap as a concentrated electrical arc that ignites the compressed air fuel mixture. The Nissan Quest Spark Plug is sealed against combustion gases despite each routine service encountering serious temperature and pressure. The combustion event sparks the flame front which pushes the piston downwards, thus creating power. The Spark Plug fires about 300 to 400 times each minute at idle and 1,000 to 1,200 times per minute at a typical highway speed, repeating this task for many thousands of miles before sufficient wear occurs on the electrode. By keeping the proper gap and correct heat range, the engine of Nissan Quest runs properly and does not misfire.
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