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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 >> Installation Procedure

Installation 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.
  1. If the manifold was replaced install the following:
    • Vacuum source manifold
    • PCV valve
    • MAP sensor
    • Throttle body
    2. Fig 1: View Of Upper-To-Lower Intake Manifold Carrier Gasket & Upper Intake Manifold
    GM405818Courtesy of GENERAL MOTORS CORP.
  2. Install the upper-to-lower intake manifold carrier gasket to the upper intake manifold.
    3. Fig 2: Identifying Upper Intake Manifold Bolts & Studs
    GM910998Courtesy of GENERAL MOTORS CORP.
  3. Carefully install the upper intake manifold (5) onto the lower intake manifold. Ensure that the alignment pins in the upper intake manifold align with the holes in the lower intake manifold.
  4. Apply threadlock compound to the threads of the bolts (1, 4) and the studs (2, 3). Refer to Sealers, Adhesives, and Lubricants  for the correct part number.
    5. Fig 3: Identifying Upper Intake Manifold Bolt Tightening Sequence
    GM49828Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  5. Install the upper intake manifold bolts and the studs (1-10).

    Tighten:  Tighten the bolts in sequence to 10 N.m (89 lb in).

    6. Fig 4: Identifying Fuel Rail Assembly & Fuel Injectors
    GM910936Courtesy of GENERAL MOTORS CORP.
  6. Lightly coat the fuel injectors (3) with clean engine oil.
    7. IMPORTANT: Ensure the fuel rail is fully seated in the lower intake manifold assembly.
  7. Install the fuel rail assembly (1) to the lower intake assembly.
  8. Install the fuel rail nuts (2).

    Tighten:  Tighten the nuts to 10 N.m (89 lb in).

  9. Connect the EVAP purge solenoid pipe quick connect fitting. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement .
    10. Fig 5: Identifying EGR Valve Wiring Harness Heat Shield Nut & Bolt
    GM911071Courtesy of GENERAL MOTORS CORP.
  10. Install the EGR valve wiring harness heat shield (3), the nut (1) and the bolt (2).

    Tighten:  Tighten the nut and the bolt to 10 N.m (89 lb in).

    11. Fig 6: Identifying Brake Booster Hose & Vacuum Source Manifold
    GM910975Courtesy of GENERAL MOTORS CORP.
  11. Install the brake booster hose (1) to the vacuum source manifold (2).
  12. Connect the electrical connectors to the following:
    • MAF sensor
    • MAP sensor
    • EVAP purge solenoid
    • ETC
  13. Install the right spark plug wires to the ignition control module and the upper intake manifold. Refer to Spark Plug Wire Replacement .
  14. Install the air cleaner intake duct. Refer to Air Cleaner Inlet Duct Replacement .
  15. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
  16. Fill the cooling system. Refer to Cooling System Draining and Filling (L26, LY7 GE 47716 Fill) or Cooling System Draining and Filling (L26 Static Fill) .
  17. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (L26) .
  18. Inspect for fluid or vacuum leaks.
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