GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Astro - 4WD 🢒 Body and Accessories 🢒 Interior Trim 🢒 Intake Manifold Assemble

    Object Number: 12867 Size: SH

    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.

  1. If reusing the fastener, apply threadlock GM P/N 12345382 or equivalent to the threads of the TBI fuel meter body bracket bolt.
  2. Install the TBI fuel meter body bracket and bolt.

    3. Tighten
    Tighten the TBI fuel meter bracket bolt to 10 N·m (88 lb in).

  3. Install the TBI fuel meter body into the TBI fuel meter body bracket.
  4. Install the 6 poppet nozzles into the proper lower intake manifold bores.
  5. Inspect the poppet nozzles in order to ensure that the poppet nozzles are firmly seated and locked in the lower intake manifold bores.
  6. Install a NEW TBI fuel meter body seal into the groove of the TBI fuel meter body.

    7. Object Number: 334516 Size: SH
  7. Install a NEW upper intake manifold to lower intake manifold gasket into the groove of the upper intake manifold.
  8. Install the upper intake manifold onto the lower intake manifold.
  9. If reusing the fasteners, apply threadlock GM P/N 12345382 or equivalent to the threads of the upper intake manifold attaching studs.
  10. Install the upper intake manifold attaching studs.

    11. Tighten

    1. Tighten the upper intake manifold attaching studs on the first pass to 5 N·m (44 lb in).
    2. Tighten the upper intake manifold attaching studs on the final pass to 9 N·m (80 lb in).

    Object Number: 334511 Size: SH
  11. If reusing the fasteners, apply threadlock GM P/N 12345382 or equivalent to the threads of the evaporative emission (EVAP) canister purge solenoid valve studs.
  12. Install the EVAP canister purge solenoid valve and studs.

    13. Tighten
    Tighten the EVAP canister purge solenoid valve studs to 10 N·m (88 lb in).

  13. Install the engine wiring harness bracket and nut.

    14. Tighten
    Tighten the engine wiring harness bracket nut to 12 N·m (106 lb in).


    Object Number: 334517 Size: SH
  14. Install the NEW fuel seals (8) (black O-rings) into the TBI fuel meter body.
  15. Install the NEW spacer rings (7) (flat washers) into the TBI fuel meter body.
  16. Install the NEW fuel seals (6) (yellow O-rings) into the TBI fuel meter body.
  17. Install the NEW fuel seal retainers (5) into the TBI fuel meter body.
  18. Install the fuel pipe (3) into the TBI fuel meter body.
  19. Install the fuel pipe retainer bracket (2) onto the fuel pipe.
  20. Install the fuel pipe retainer bracket nuts (1).
  21. If reusing the fastener, apply threadlock GM P/N 12345382 or equivalent to the threads of the fuel pipe bolt.
  22. Install the fuel pipe bolt (4).

    23. Tighten

    1. Tighten the fuel pipe bracket nuts to 3 N·m (27 lb in).
    2. Tighten the fuel pipe bolt to 6 N·m (53 lb in).

    Object Number: 10933 Size: SH
  23. Install a NEW manifold absolute pressure (MAP) sensor seal onto the MAP sensor.
  24. Apply a small amount (1 drop) of clean engine oil to the MAP sensor seal.
  25. Install the MAP sensor into the upper intake manifold.

    26. Object Number: 31466 Size: SH
  26. Install the ignition coil and studs.

    27. Tighten
    Tighten the ignition coil studs to 12 N·m (106 lb in).


    Object Number: 10932 Size: SH
  27. If reusing the engine coolant temperature (ECT) sensor (if equipped), apply sealant GM P/N 12346004 or equivalent to the threads of the ECT sensor.
  28. Install the ECT sensor (if equipped) into the front of the lower intake manifold.

    29. Tighten
    Tighten the ECT sensor to 20 N·m (15 lb ft).


    Object Number: 22078 Size: SH

    Important: The exhaust gas recirculation (EGR) valve must be installed in the original orientation.

  29. Install a NEW EGR valve gasket and the EGR valve.

    30. Object Number: 22075 Size: SH
  30. Install the EGR valve bolts.

    31. Tighten

    1. Tighten the EGR valve bolts on the first pass to 7 N·m (62 lb in).
    2. Tighten the EGR valve bolts on the final pass to 30 N·m (22 lb ft).

    Object Number: 48323 Size: SH
  31. Install the engine coolant thermostat.
  32. Install the water outlet.
  33. Install the water outlet studs.

    34. Tighten
    Tighten the water outlet studs to 25 N·m (18 lb ft).


    Object Number: 12853 Size: SH
  34. Install a NEW throttle body gasket into the groove in the upper intake manifold.
  35. Install the throttle body onto the upper intake manifold.

    36. Object Number: 12852 Size: SH
  36. If reusing the fasteners, apply threadlock GM P/N 12345382 or equivalent to the threads of the throttle body attaching studs.
  37. Install the throttle body attaching studs.

    38. Tighten
    Tighten the throttle body attaching studs to 9 N·m (80 lb in).


    Object Number: 374902 Size: SH
  38. Install the accelerator control cable bracket, the studs, and the nuts.

    39. Tighten

    1. Tighten the accelerator control cable bracket stud to the intake manifold to 6 N·m (53 lb in).
    2. Tighten the accelerator control cable bracket nuts to 12 N·m (106 lb in).
    3. Tighten the accelerator control cable bracket stud to the throttle body to 12 N·m (106 lb in).