The Nissan Frontier's Knock Sensor detects the occurrence of spark knock via vibrations while controlling the ignition timing as per the powertrain control module. The Knock Sensor usually refers to a piezoelectric device that converts the pressure pulses created by detonation into electrical signals sent to the vehicle computer. Nissan controllers retard timing in small increments until combustion stabilizes. Then timing is slowly advanced again, with operation nearly at the knock limit for a good balance of performance, economy, and emissions protection. The system can adjust the timing on a cylinder-by-cylinder basis thanks to the Knock Sensor. In the case of turbocharged engines, it can also help with boost control strategies to eliminate the risk of detonation. Placed on the engine block where the vibration transmission is strong, the Knock Sensor continues to operate as part of the electronic ignition network. A defective Knock Sensor can cause the computer to not acknowledge knock, and this can lead to continuous detonation and engine damage. Authentic Nissan parts keep the sensor built to factory specifications so a Frontier engine can operate at optimum levels, and selecting a direct-fit Nissan replacement helps restore original Frontier performance.
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