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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 (L26) >> Removal Procedure

Removal 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: The two bolts which fasten the lower intake manifold to the cylinder head are accessible only after the upper intake is removed. The bolts are located in the right front and left rear corners of the lower intake manifold. Remove the upper intake manifold to service the lower intake.
  1. Remove the upper intake manifold. Refer to Intake Manifold Replacement - Upper .
  2. Remove the generator brace. Refer to Generator Brace Replacement (L26) or Generator Brace Replacement (L32) in Engine Electrical.
  3. Remove the drive belt tensioner with the heater water bypass inlet pipe. Refer to Drive Belt Tensioner Replacement .
    4. Fig 1: View Of Drive Belt Tensioner
    GM326960Courtesy of GENERAL MOTORS CORP.
  4. Remove the exhaust gas recirculation (EGR) outlet pipe bolt (2) from the lower intake manifold.
    5. Fig 2: EGR Outlet Pipe & Lower Intake Manifold
    GM911030Courtesy of GENERAL MOTORS CORP.
  5. Remove the EGR outlet pipe (1) from the lower intake manifold.
  6. Remove the radiator inlet hose from the water outlet housing. Refer to Radiator Hose Replacement - Inlet (L26 L32) in Engine Cooling.
    7. Fig 3: Radiator Inlet Hose & Water Outlet Housing
    GM405984Courtesy of GENERAL MOTORS CORP.
  7. Disconnect the engine coolant temperature (ECT) sensor electrical connector.
    8. Fig 4: ECT Sensor Electrical Connector
    GM406011Courtesy of GENERAL MOTORS CORP.
  8. Remove the generator brace bracket bolts.
    9. Fig 5: Generator Brace Bracket & Bolts
    GM371022Courtesy of GENERAL MOTORS CORP.
  9. Remove the generator brace bracket.
  10. Remove the lower intake manifold bolts.
    11. Fig 6: Lower Intake Manifold & Bolts
    GM190545Courtesy of GENERAL MOTORS CORP.
  11. Remove the lower intake manifold.
    12. Fig 7: Lower Intake Manifold Seals
    GM153573Courtesy of GENERAL MOTORS CORP.
  12. Remove the lower intake manifold seals.
  13. Remove the lower intake manifold gaskets.
    14. Fig 8: Lower Intake Manifold Gaskets
    GM153574Courtesy of GENERAL MOTORS CORP.
  14. If replacing the lower intake manifold, remove the water outlet housing bolt, stud and the water outlet housing.
    15. Fig 9: Water Outlet Housing Bolt & Stud
    GM406012Courtesy of GENERAL MOTORS CORP.
  15. If replacing the lower intake manifold, remove the ECT sensor.
  16. Inspect the flatness of the inlet flanges.
  17. Clean the intake manifold gasket mating surfaces.
  18. Clean the intake manifold bolts and bolt holes of adhesive compound.
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