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Home >> GMC >> 2005 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 174 (Engine Mechanical - 3.6L (Ly7) (2 Of 6)) >> On-Vehicle Repair Instructions - Part 1 >> Intake Manifold Replacement - Upper >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2005 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
  1. If the upper intake manifold is being replaced, assemble the intake manifold. Refer to Intake Manifold Assemble .
    2. Fig 1: View Of Upper Intake Manifold
    GM1285188Courtesy of GENERAL MOTORS CORP.
  2. Install a NEW upper intake manifold gasket.
  3. Install the upper intake manifold.
    4. NOTE: Refer to Fastener Notice in Cautions and Notices.
    IMPORTANT: Tighten the intake manifold bolts in a circular pattern starting at the center (long bolts) and moving outward.
  4. Install the upper intake manifold bolts.

    Tighten:  Tighten the upper intake manifold bolts to 23 N.m (17 lb ft).

    5. Fig 2: Identifying Barometric Pressure Sensor And Electrical Connector
    GM945437Courtesy of GENERAL MOTORS CORP.
  5. Connect the barometric pressure sensor electrical connector.
    6. Fig 3: View Of Communicator And Intake Manifold Runner Control Solenoid Electrical Connectors
    GM945390Courtesy of GENERAL MOTORS CORP.
  6. Connect the intake manifold runner control solenoid electrical connector.
  7. Connect the PCV hose to the right bank camshaft cover.
    8. Fig 4: View Of Upper Intake Manifold Brace Stud, Bolt, And Brace
    GM1522522Courtesy of GENERAL MOTORS CORP.
  8. Install the upper intake manifold brace, stud (1) and bolt (2).

    Tighten:  Tighten the intake manifold brace bolt/stud.

    1. Tighten the intake manifold brace bolt (2) to 65 N.m (48 lb ft).
    2. Tighten the intake manifold brace stud (1) to 10 N.m (89 lb in).
    9. Fig 5: View Of Throttle Body Electrical Connector
    GM887881Courtesy of GENERAL MOTORS CORP.
    NOTE: Ensure proper engagement of the wiring harness connector. The wiring harness connector must be installed straight onto the component connector and firmly seated. Visually inspect the connector to ensure that the connector latches are engaged and locked. Any damage to the connector or wiring must be repaired. Failure to follow this procedure can lead to an intermittent electrical connection, driveability concerns, and/or wiring harness or wiring harness connector damage or failure.
  9. Connect the electrical connector to the throttle body.
    10. Fig 6: View Of Wiring Harness Conduit
    GM1285256Courtesy of GENERAL MOTORS CORP.
  10. Install the wiring harness retainer.
    11. Fig 7: Top Of Engine View
    GM1348201Courtesy of GENERAL MOTORS CORP.
  11. Connect the purge line (3) to the purge solenoid valve.
    12. Fig 8: View Of Purge Solenoid Valve And Electrical Connector
    GM887878Courtesy of GENERAL MOTORS CORP.
  12. Connect the purge solenoid valve electrical connector.
  13. Connect the brake booster vacuum hose to the intake manifold.
    14. Fig 9: View Of Air Inlet Duct
    GM1305320Courtesy of GENERAL MOTORS CORP.
  14. Install the air inlet duct. Refer to Air Cleaner Intake Duct Replacement in Engine Controls - 3.6L (LY7).
  15. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
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