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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Engine Mechanical - 3.9L) >> 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. Remove the coolant crossover pipe. Refer to COOLANT CROSSOVER PIPE REPLACEMENT - LZ9 (3.9L) .
  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) electrical connector.
  6. Disconnect the fuel feed line from the fuel rail. Refer to METAL COLLAR QUICK CONNECT FITTING SERVICE .
    7. Fig 1: Identifying Fuel Injector Harness Connector & Bracket
    GM1675736Courtesy of GENERAL MOTORS CORP.
  7. Remove the connector position assurance (CPA) retainer (2).
  8. Disconnect the engine harness electrical connector (3) from the fuel injector harness electrical connector.
    9. Fig 2: Identifying Fuel Rail
    GM1557674Courtesy of GENERAL MOTORS CORP.
  9. Remove the fuel injector harness connector bracket bolt from the intake manifold.
  10. Disconnect the camshaft position (CMP) sensor electrical connector.
  11. Remove the fuel injector rail bolts.
  12. Remove the fuel rail (1).
    13. Fig 3: View Of Lower Intake Manifold & Bolts
    GM54281Courtesy of GENERAL MOTORS CORP.
  13. Remove the lower intake manifold bolts.
  14. Remove the lower intake manifold.
    15. Fig 4: Identifying Valve Rocker Arm & Bolt
    GM1557679Courtesy of GENERAL MOTORS CORP.
  15. Loosen the valve rocker arm bolts.
    16. IMPORTANT: Place the valve train components in a rack in order to ensure that the components are installed in the same location from which they where removed.
  16. Remove the valve rocker arms.
  17. Remove the push rods.
    • The intake push rods measure 147.51 mm (5.81 in).
    • The exhaust push rods measure 154.87 mm (6.1 in).
    18. Fig 5: Identifying Intake Manifold Gaskets & Seals
    GM1557681Courtesy of GENERAL MOTORS CORP.
  18. Remove the lower intake manifold gaskets and seals.
  19. Clean the lower intake manifold gasket and seal surfaces on the cylinder heads and the engine block.
  20. Clean the gasket and seal surfaces on the lower intake manifold with degreaser.
  21. Remove all the loose room temperature vulcanizing sealer (RTV) (1).
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