Knock Sensor Replacement Bank 1

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.

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable.

Caution: Provide additional support when a vehicle is on a hoist:

•	Before removing parts, support the opposite end. This helps prevent the vehicle from slipping off.

•	Before removing major components, chain the vehicle frame to the hoist pads at the same end as the removal. This helps avoid a tip-off.

Failure to follow these precautions could cause vehicle damage, serious personal injury, or death.
2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.



3. Remove the splash shield. Refer to Engine Splash Shield Replacement in Body Rear End.
4. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.



5. Remove the knock sensor heat shield mounting bolt located under the freeze plug (or block heater if equipped).
6. Disconnect the knock sensor wiring harness connector from the knock sensor.
7. Remove the knock sensor from the engine block.

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 into the engine block.

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

2. Install the knock sensor heat shield mounting bolt located under the freeze plug (or block heater if equipped).
3. Connect the knock sensor wiring harness connector to the knock sensor.
4. Install the splash shield. Refer to Engine Splash Shield Replacement in Body Rear End.
5. Lower the vehicle.
6. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
7. Connect the negative battery cable.

Knock Sensor Replacement Bank 2

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.

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable. Refer to Battery Cable in Engine Electrical.

Caution: Provide additional support when a vehicle is on a hoist:

•	Before removing parts, support the opposite end. This helps prevent the vehicle from slipping off.

•	Before removing major components, chain the vehicle frame to the hoist pads at the same end as the removal. This helps avoid a tip-off.

Failure to follow these precautions could cause vehicle damage, serious personal injury, or death.
2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle
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 (4).



7. Remove the knock sensor from the engine block.

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.

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.

1. Install the knock sensor (4) into the engine block.

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

2. Install the knock sensor heat shield.

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

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