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Home >> Buick >> 2008 >> Allure CXL >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Mechanical - 5.3L) >> Repair Instructions - On Vehicle >> Intake Manifold Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different variant/trim than selected.
IMPORTANT: The intake manifold, throttle body, fuel rail, and injectors may be removed as an assembly. If not servicing the individual components, remove the manifold as a complete assembly.
    Fig 1: View Of Brake Booster Vacuum Hose
    GM1551866Courtesy of GENERAL MOTORS CORP.
  1. Remove the throttle body. Refer to Throttle Body Assembly Replacement .
  2. Remove the fuel injectors. Refer to Fuel Injector Replacement .
  3. Remove the brake booster vacuum hose (1) from the intake manifold (2) and the booster check valve (3).
    4. Fig 2: View Of Positive Crankcase Ventilation (PCV) Clean Air Tube
    GM1551864Courtesy of GENERAL MOTORS CORP.
  4. Remove the positive crankcase ventilation (PCV) clean air tube from the air intake duct and valve rocker arm cover. Refer to Plastic Collar Quick Connect Fitting Service .
    5. Fig 3: Identifying PCV Foul Air Tube
    GM1616429Courtesy of GENERAL MOTORS CORP.
  5. Remove the PCV foul air tube from the intake manifold and valve rocker arm cover. Refer to Plastic Collar Quick Connect Fitting Service .
    6. Fig 4: View Of Fuel Feed Line & Evaporative Emission (EVAP) Line
    GM1551868Courtesy of GENERAL MOTORS CORP.
  6. Remove the evaporative emission (EVAP) purge solenoid tube (2) from the solenoid and reposition. Refer to Plastic Collar Quick Connect Fitting Service .
    7. Fig 5: View Of Oil Pressure Sensor Electrical Connectors
    GM1551867Courtesy of GENERAL MOTORS CORP.
  7. Disconnect the following electrical connectors:
    • EVAP purge solenoid (1)
    • Manifold absolute pressure (MAP) sensor (2)
    • Oil pressure sensor (4)
    • Valve lifter oil manifold (5)
    8. Fig 6: View Of MAP Sensor
    GM1411911Courtesy of GENERAL MOTORS CORP.
  8. Remove the MAP sensor (714) from the intake manifold.
    9. Fig 7: Identifying EVAP Purge Solenoid Valve
    GM1655017Courtesy of GENERAL MOTORS CORP.
  9. Remove the EVAP purge solenoid valve and bracket.
    10. Fig 8: View Of The Intake Manifold Bolts
    GM1411912Courtesy of GENERAL MOTORS CORP.
  10. Remove the intake manifold bolts (512).
  11. Remove the intake manifold (500).
    12. Fig 9: View Of Intake Manifold-To-Cylinder Head Gaskets
    GM1272799Courtesy of GENERAL MOTORS CORP.
  12. Remove and discard the intake manifold gaskets (514).
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