GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 Sierra - 4WD 🢒 Engine 🢒 Engine Controls and Fuel - 4.3L 🢒 Knock Sensor 1 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: 1877013 Size: SH
  3. Remove the knock sensor heat shield bolt and shield.

    4. Object Number: 1877014 Size: SH
  4. Reposition the knock sensor sleeve (2) down, away from the knock sensor.
  5. Disconnect the engine wiring harness electrical connector (1) from the knock sensor.

    6. Object Number: 1877015 Size: SH
  6. Remove the knock sensor bolt and sensor.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1877015 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: 1877014 Size: SH
  2. Connect the engine wiring harness electrical connector (1) to the knock sensor.
  3. Position the knock sensor sleeve (2) up and over the knock sensor.

    4. Object Number: 1877013 Size: SH
  4. Position the knock sensor heat shield to the engine block and install the bolt.

    5. Tighten
    Tighten the bolt to 10 N·m (89 lb in).


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

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

  6. Lower the vehicle.