Removal Procedure

CAUTION: Hot engine coolant may cause severe burns. Although the cooling system has been drained, coolant still remains in the engine water jacket. This coolant will drain with the removal of the knock sensor.

Fig 1: Disconnecting/Reconnecting Knock Sensor

Courtesy of GENERAL MOTORS CORP.

Turn OFF the ignition switch.
Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Remove the bolts from the splash shield.
Drain the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.
Remove the bolts (2) from the knock sensor heat shield (1) located under the freeze plug (or block heater if equipped).
Disconnect the knock sensor wiring harness connector (3) from the knock sensor (4).

Fig 2: Removing/Installing Knock Sensor

Courtesy of GENERAL MOTORS CORP.

Remove the knock sensor (2) from the engine block (1).