GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 877275  Size: SH
  1. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  3. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  4. Loosen the charged air cooler outlet duct clamp (1).
  5. Important: Do not use a screwdriver or other tool to pry the hose loose. The hose can be torn or damage. Loosen the hose by twisting.

  6. Remove the charged air cooler outlet duct.

  7. Object Number: 877281  Size: SH
  8. Loosen the charged air cooler inlet duct to turbocharger clamp (1).
  9. Important: Do not use a screwdriver or other tool to pry the hose loose. The hose can be torn or damage. Loosen the hose by twisting.

  10. Remove the charged air cooler inlet duct from the turbocharger.
  11. Remove the engine wiring harness. Refer to Engine Wiring Harness Assembly Replacement .

  12. Object Number: 791983  Size: SH
  13. Remove the fuel feed front pipe bracket nut.
  14. Remove the fuel feed front pipe (1).

  15. Object Number: 791996  Size: SH
  16. Reposition the fuel injection fuel feed front hose clamps.
  17. Remove the fuel injection fuel feed front hose.
  18. Remove the glow plug relay. Refer to Glow Plug Relay Replacement .

  19. Object Number: 660446  Size: SH
  20. Remove the fuel return rear pipe bolt (2) from the cylinder head.

  21. Object Number: 755230  Size: SH
  22. Remove the fuel pipe clip bolt and clip.

  23. Object Number: 791904  Size: SH
  24. Remove the fuel return rear pipe bolt and pipe.
  25. Remove and discard the return pipe gaskets.

Installation Procedure

Important: Always install NEW copper gaskets onto the fuel injector fuel return pipe.


    Object Number: 791904  Size: SH
  1. Install NEW the return pipe gaskets.
  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 fuel return rear pipe and bolt.
  4. Tighten
    Tighten the bolt to 27 N·m (19 lb ft).


    Object Number: 755230  Size: SH
  5. Install the fuel pipe clip and bolt.
  6. Tighten
    Tighten the bolt to 16 N·m (11 lb ft).


    Object Number: 660446  Size: SH
  7. Install the fuel return rear pipe bolt (2) to the cylinder head.
  8. Tighten
    Tighten the bolt to 15 N·m (11 lb ft).

  9. Install the glow plug relay. Refer to Glow Plug Relay Replacement .

  10. Object Number: 791996  Size: SH
  11. Install the fuel injection fuel feed front hose.
  12. Reposition the fuel injection fuel feed front hose clamps.

  13. Object Number: 791983  Size: SH
  14. Install the fuel feed front pipe (1).
  15. Install the fuel feed front pipe bracket nut.
  16. Tighten
    Tighten the nut to 8 N·m (70 lb in).


    Object Number: 877281  Size: SH
  17. Install the engine wiring harness. Refer to Engine Wiring Harness Assembly Replacement .
  18. Install the charged air cooler inlet duct to the turbocharger.
  19. Align the mark on the duct (2) with the mark on the turbocharger.
  20. Position the clamp (1) as shown for proper clearance.
  21. Tighten
    Tighten the clamp to 6 N·m (53 lb in).


    Object Number: 877275  Size: SH
  22. Install the charged air cooler outlet duct to the intake.
  23. Align the mark on the duct (3) with the mark on the turbocharger.
  24. Position the clamp (1) as shown for proper clearance.
  25. Tighten
    Tighten the clamp to 6 N·m (53 lb in).

  26. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  27. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  28. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.