GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 Sierra - 4WD 🢒 Engine 🢒 Engine Controls and Fuel - 4.3L 🢒 Knock Sensor 2 Replacement

Removal Procedure

    Object Number: 1698082 Size: SH
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. If equipped, remove the oil pan skid plate and bolts.

    3. Object Number: 1877018 Size: SH
  3. Reposition the knock sensor sleeve (3) down, away from the knock sensor.
  4. Disconnect the engine wiring harness electrical connector (1) from the knock sensor.

    5. Object Number: 1877020 Size: SH
  5. Remove the knock sensor bolt and sensor.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1877020 Size: SH
  1. Position the knock sensor to the engine block and install the bolt.

    2. Tighten
    Tighten the bolt to 25 N·m (18 lb ft).


    Object Number: 1877018 Size: SH
  2. Connect the engine wiring harness electrical connector (1) to the knock sensor.
  3. Position the knock sensor sleeve (3) up and over the knock sensor.

    4. Object Number: 1698082 Size: SH
  4. If equipped, position the oil pan skid plate and install the bolts.

    5. Tighten
    Tighten the bolts to 28 N·m (21 lb ft).

  5. Lower the vehicle.