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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 203 (Engine Mechanical - 3.5L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Intake Manifold Replacement - Lower >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: This engine uses a sequential multiport fuel injection system. Injector wiring harness connectors must be connected to their appropriate fuel injector or exhaust emissions and engine performance may be seriously affected.
  1. Disconnect the battery ground negative cable. See Engine Electrical.
  2. Remove the upper intake manifold. Refer to Intake Manifold Replacement - Upper .
  3. Remove the left valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement - Left .
  4. Remove the right valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement - Right .
  5. Disconnect the engine coolant temperature (ECT) wiring harness.
    6. Fig 1: View Of Fuel Injector And Manifold Air Pressure (MAP) Wiring Harness
    GM909595Courtesy of GENERAL MOTORS CORP.
  6. Disconnect and remove the fuel injector and manifold air pressure (MAP) wiring harness.
  7. Remove the fuel injector rail. Refer to Fuel Rail Assembly Replacement in Engine Controls - 3.5L.
  8. Disconnect the heater inlet pipe with heater hose from the lower intake manifold and reposition.
  9. Disconnect the radiator inlet hose from the engine. Refer to Radiator Hose Replacement - Inlet in Engine Cooling.
    10. Fig 2: View Of Water Outlet
    GM909572Courtesy of GENERAL MOTORS CORP.
  10. Remove the water outlet.
    11. Fig 3: Locating Thermostat
    GM187058Courtesy of GENERAL MOTORS CORP.
  11. Remove the thermostat.
    12. Fig 4: View Of Lower Intake Manifold & Bolts
    GM54281Courtesy of GENERAL MOTORS CORP.
  12. Remove the lower intake manifold bolts.
  13. Remove the lower intake manifold.
  14. Remove the valve rocker arms and pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .
    15. Fig 5: View Of Lower Intake Manifold Gaskets & Seals
    GM61820Courtesy of GENERAL MOTORS CORP.
  15. Remove the lower intake manifold gaskets and seals.
  16. Clean the lower intake manifold gasket and seal surfaces on the cylinder heads and the engine block.
  17. Clean the gasket and seal surfaces on the lower intake manifold with degreaser.
  18. Remove all the loose room temperature vulcanizing sealer (RTV) (1).
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