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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1112 (Engine Mechanical - 3.6L (2 Of 6)) >> On-Vehicle Repair Instructions (1 Of 2) >> Upper Intake Manifold Replacement (LY7) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Intake Manifold Bolts
    GM1978050Courtesy of GENERAL MOTORS CORP.
  1. If the intake manifold is being replaced, assemble the intake manifold. Refer to Intake Manifold Assemble (LY7) or Intake Manifold Assemble (LLT) .
  2. Install a NEW intake manifold gasket.
  3. Install the intake manifold.
    4. NOTE: Refer to Fastener Notice .
    IMPORTANT: Tighten the intake manifold bolts in a circular pattern starting at the center (long bolts) and moving outward.
  4. Install the intake manifold bolts (1).

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

    5. Fig 2: Identifying Intake Manifold Rear Heat Shield Bolts
    GM1977980Courtesy of GENERAL MOTORS CORP.
  5. Install the intake manifold rear heat shield bolts (1).

    Tighten:  Tighten the heat shield bolts to 23 N.m (17 lb ft).

  6. Cclip the engine harness from the left side of the intake manifold.
    7. Fig 3: Identifying PCV Dirty Air Tube
    GM1977217Courtesy of GENERAL MOTORS CORP.
  7. Connect the positive crankcase ventilation (PCV) hose (1) to the intake manifold (3).
    8. Fig 4: View of Intake Manifold Brace Assembly
    GM1977964Courtesy of GENERAL MOTORS CORP.
  8. Position the intake manifold brace.
  9. Install the intake manifold brace bolts (1).

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

    10. Fig 5: View of Wiring Harness Connector
    GM1977918Courtesy 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.
  10. Connect the electrical connector (2) to the throttle body.
  11. Install the throttle body harness electrical harness retainer (1).
    12. Fig 6: View of Purge Line and Intake Manifold
    GM1977864Courtesy of GENERAL MOTORS CORP.
  12. Connect the purge line (1) to the intake manifold (2).
  13. Install the purge solenoid valve bracket and bolts.

    Tighten:  Tighten the solenoid valve bracket bolts 23 N.m (17 lb ft).

    14. Fig 7: View of Brake Booster Vacuum Hose
    GM1977775Courtesy of GENERAL MOTORS CORP.
  14. Connect the brake booster vacuum hose (1) to the power steering booster pump (3) and the intake manifold (2).
  15. Install the air outlet duct. Refer to Air Cleaner Outlet Duct Replacement (LY7) or Air Cleaner Outlet Duct Replacement (LLT) .

    Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (LY7)  or Fuel Injector Sight Shield Replacement (LLT) .

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