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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 27 (Engine Mechanical - 3.8L) >> Repair Instructions - On Vehicle >> Upper Intake Manifold Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Brake Booster Hose & Vacuum Source Manifold
    GM910975Courtesy of GENERAL MOTORS CORP.
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (L26) .
  2. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
  3. Remove the air cleaner intake duct. Refer to Air Cleaner Inlet Duct Replacement .
  4. Drain the cooling system. Refer to Cooling System Draining and Filling (L26, LY7 GE 47716 Fill) or Cooling System Draining and Filling (L26 Static Fill) .
  5. Remove the right spark plug wires from the ignition control module and the upper intake manifold and reposition the wires. Refer to Spark Plug Wire Replacement .
  6. Relieve the fuel pressure. Refer to Fuel Pressure Relief (Without OH 48027) or Fuel Pressure Relief (With OH 48027) .
  7. Remove the brake booster hose (1) from the vacuum source manifold (2).
  8. Disconnect the electrical connectors from the following:
    • Electronic throttle control (ETC)
    • Evaporative emission (EVAP) purge solenoid
    • Manifold absolute pressure (MAP) sensor
    • Mass air flow (MAF) sensor
    9. Fig 2: Identifying EGR Valve Wiring Harness Heat Shield Nut & Bolt
    GM911071Courtesy of GENERAL MOTORS CORP.
  9. Remove the exhaust gas recirculation (EGR) valve wiring harness heat shield nut (1), bolt (2) and the EGR heat shield (3).
  10. Disconnect the EVAP purge solenoid pipe quick connect fitting. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
    11. Fig 3: Identifying Fuel Rail Assembly & Fuel Injectors
    GM910936Courtesy of GENERAL MOTORS CORP.
  11. Remove the fuel rail assembly nuts (2).
  12. Remove the fuel rail assembly (1) with the fuel injectors (3).
    13. Fig 4: Identifying Upper Intake Manifold Bolts & Studs
    GM910998Courtesy of GENERAL MOTORS CORP.
  13. Remove the upper intake manifold bolts (1, 4) and the studs (2, 3).
  14. Clean the upper intake manifold bolt threads.
  15. Remove the upper intake manifold.
    16. Fig 5: View Of Upper-To-Lower Intake Manifold Carrier Gasket & Upper Intake Manifold
    GM405818Courtesy of GENERAL MOTORS CORP.
  16. Remove the upper-to-lower intake manifold carrier gasket from the upper intake manifold.
  17. If the upper intake manifold is being replaced, remove the following:
    • Throttle body
    • MAP sensor
    • Positive crankcase ventilation (PCV) valve
    • Vacuum source manifold
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