GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Important: Do not try to disassemble the EGR valve. Service only as a complete assembly.

Important: Carefully note the position of the EGR valve before removal. Do not rotate the EGR valve 180 degrees.


    Object Number: 178487  Size: SH
  1. Remove the electrical connector.
  2. Remove the valve to flange attaching bolts.
  3. Notice: The EGR valve is an electrical component. Soaking the EGR valve in a liquid cleaner or a solvent causes damage to the valve.

  4. Remove the EGR valve.
  5. Remove the flange gasket.
  6. Clean the EGR valve gasket surface.

Installation Procedure


    Object Number: 178487  Size: SH
  1. Install the new flange gasket
  2. Install the linear EGR valve.
  3. 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.

  4. Install the valve to flange bolts.
  5. Tighten

    1. Tighten the bolts the first time to 10 N·m (89 lb in) each.
    2. Tighten the bolts a final time to 25 N·m (18 lb ft) each.
  6. Install the electrical connector.