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Home >> Buick >> 2004 >> Century Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 134 (Engine Mechanical - 3.8L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Intake Manifold Replacement - Lower (L32) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  1. If removed, install the ECT sensor.

    Tighten:  Tighten the ECT sensor to 25 N.m (18 lb ft).

  2. If removed, install the thermostat, the gasket, and the water outlet housing.
  3. Install the water outlet housing bolt and the stud.

    Tighten:  Tighten the bolt and the stud to 27 N.m (20 lb ft).

    4. Fig 1: Water Outlet Housing Bolt & Stud
    GM406012Courtesy of GENERAL MOTORS CORP.
  4. Install the intake manifold gaskets.
    5. Fig 2: Installing Intake Manifold Gaskets
    GM97725Courtesy of GENERAL MOTORS CORP.
  5. Apply sealer, GM P/N 12346286 (Canadian P/N 10953472) or equivalent, to the ends of the intake seals.
  6. Install the lower intake manifold seals.
  7. Align the coolant bypass tube with the opening in the manifold. Install the lower intake manifold.
  8. Install the lower intake manifold bolts.

    Tighten:  Tighten the lower intake manifold bolts from the center to the outside in sequence to 15 N.m (11 lb ft).

    9. Fig 3: Lower Intake Manifold Bolts
    GM97724Courtesy of GENERAL MOTORS CORP.
  9. Connect the ECT sensor electrical connector.
  10. Install the EGR outlet pipe (1) to the lower intake manifold.
    11. Fig 4: EGR Outlet Pipe & Lower Intake Manifold
    GM911030Courtesy of GENERAL MOTORS CORP.
  11. Install the EGR outlet pipe bolt (2).

    Tighten:  Tighten the bolt to 29 N.m (21 lb ft).

  12. Install the radiator inlet hose to the water outlet housing. Refer to Radiator Hose Replacement - Inlet (L26 L32) in Engine Cooling.
    13. Fig 5: Radiator Inlet Hose & Water Outlet Housing
    GM405984Courtesy of GENERAL MOTORS CORP.
  13. Install the supercharger. Refer to Supercharger Replacement .
  14. Fill the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.
  15. Inspect for fluid or vacuum leaks.
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