GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 Envoy - 2WD 🢒 Engine 🢒 Engine Controls - 4.2L 🢒 Knock Sensor Replacement

Removal Procedure
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .

    2. Object Number: 727528 Size: SH
  2. Remove the knock sensor harness connector (4).
  3. Remove the knock sensor retaining bolt (3).
  4. Remove the appropriate knock sensor (1 or 2).

Installation Procedure

    Object Number: 727528 Size: SH

    Notice: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.

  1. Install the knock sensor (1 or 2) and the bolt (3).

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

  2. Connect the knock sensor harness connector (4).
  3. Lower the vehicle.