GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 788840  Size: SH
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  2. Remove the wheelhouse panel. Refer to Wheelhouse Panel Replacement in Body Front End.
  3. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  4. Remove the glow plug nuts from the desired glow plug(s).
  5. Remove the harness from the desired glow plug(s) (1).

  6. Object Number: 660512  Size: SH

    Important: On the Federal emissions equipped vehicles there is a buss bar (2) connecting the glow plugs on each bank of the engine.

  7. Remove the desired glow plug(s).

Installation Procedure


    Object Number: 660512  Size: SH
  1. Install the glow plug(s).
  2. 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.

  3. Install the buss bar (2) and wiring, if equipped.
  4. Tighten
    Tighten the plug to 18 N·m (13 lb ft).


    Object Number: 788840  Size: SH
  5. Install the harness to the desired glow plug(s) (1).
  6. Install the glow plug nuts to the desired glow plug)s).
  7. Tighten
    Tighten the nut to 2 N·m (18 lb in).

  8. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  9. Install the wheelhouse panel. Refer to Wheelhouse Panel Replacement in Body Front End.
  10. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.