GM Service Manual Online
For 1990-2009 cars only

Engine Ground Strap Replacement With LU3

Removal Procedure


    Object Number: 1877409  Size: SH
  1. Remove the ground strap bolt from the rear of the left cylinder head.
  2. Reposition the ground strap from the cylinder head.

  3. Object Number: 663474  Size: SH
  4. Remove the ground strap nut from the stud at the front of dash.
  5. Remove the ground strap from the stud.

Installation Procedure


    Object Number: 663474  Size: SH
  1. Install the ground strap to the stud.
  2. Caution: Refer to Fastener Caution in the Preface section.

  3. Install the ground strap nut to the stud at the front of dash and tighten to 9 N·m (80 lb in).

  4. Object Number: 1877409  Size: SH
  5. Position the ground strap to the rear of the left cylinder head.
  6. Install the ground strap bolt and tighten to 16 N·m (12 lb ft).

Engine Ground Strap Replacement With V8 Engine

Removal Procedure


    Object Number: 663475  Size: SH
  1. Remove the engine wiring harness ground bolt.
  2. Reposition the engine wiring harness ground and ground strap.

  3. Object Number: 663474  Size: SH
  4. Remove the ground strap nut from the stud at the front of dash.
  5. Remove the ground strap from the stud.

Installation Procedure

    Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 663474  Size: SH
  1. Install the ground strap to the stud.
  2. Install the ground strap nut to the stud at the front of dash and tighten to 9 N·m (80 lb in).

  3. Object Number: 663475  Size: SH
  4. Position the ground strap and engine wiring harness ground.
  5. Install the engine wiring harness ground bolt tighten to 16 N·m (12 lb ft).

Engine Ground Strap Replacement With LMM

Removal Procedure


    Object Number: 1873892  Size: SH
  1. Remove the engine ground strap bolt (2) from the rear of the cylinder head.
  2. Reposition the engine ground strap (1) from the cylinder head.

  3. Object Number: 1873891  Size: SH
  4. Remove the ground strap nut (1) from the stud on the plenum front panel.
  5. Remove the ground strap (2) from the stud and the vehicle.

Installation Procedure


    Object Number: 1873891  Size: SH
  1. Install the ground strap (2) to the vehicle and the stud on the plenum front panel.
  2. Caution: Refer to Fastener Caution in the Preface section.

  3. Install the ground strap nut (1) to the stud on the plenum front pane and tighten to 9 N·m (80 lb in).

  4. Object Number: 1873892  Size: SH
  5. Position the ground strap (1) to the cylinder head.
  6. Install the ground strap bolt (2) to the cylinder head and tighten to 16 N·m (12 lb ft).