GM 88971397 Sensor,Knock

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The knock control system is designed to reduce spark knock during periods of heavy detonation. This allows the engineer to use optimal spark advances to improve driveability. The knock sensor detects abnormal vibration in the engine and produces a voltage output that increases with the severity of the knock. The voltage signal is monitored by the PCM, which retards ignition timing until the detonation ceases. The knock sensor is located on the front side of the engine block, mounted on a stud bolt, directly below the cylinder head. Disconnect the cable from the negative terminal of the battery. Drain the cooling system. Remove the intake manifold. Disconnect the electrical connector, remove the mounting nut securing the knock sensor, and remove the sensor. Install the knock sensor with the connector at the bottom and a slight angle, to prevent the accumulation of water in the connector. Tighten the knock sensor mounting fastener securely. Don't over-tighten the sensor or damage may occur. Plugin the electrical connector refill the cooling system and check for leaks.