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.

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

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

Important: Do Not apply thread sealant to sensor threads. The sensor is coated at factory and applying additional sealant will affect the sensor's ability to detect detonation.

1. Install the knock sensor (4).

Tighten
Tighten the knock sensor to 19 N·m (14 lb ft).

2. Install the knock sensor heat shield (1).

Tighten
Tighten the bolts to 60 N·m (44 lb ft).

3. Connect the knock sensor electrical connector (3) to the knock sensor.
4. Install the splash shield.
5. Lower the vehicle.
6. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.