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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> 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) >> Removal Procedure

Removal 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: View of Brake Booster Hose and Intake Manifold
    GM1977775Courtesy of GENERAL MOTORS CORP.
  1. Turn the ignition OFF.
  2. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (LY7)  or Fuel Injector Sight Shield Replacement (LLT) .
  3. Remove the air outlet duct. Refer to Air Cleaner Outlet Duct Replacement (LY7) or Air Cleaner Outlet Duct Replacement (LLT) .
  4. Disconnect the brake booster vacuum hose (1) from the intake manifold (2) and the power steering booster pump (3).
    5. Fig 2: View of Purge Line
    GM1977864Courtesy of GENERAL MOTORS CORP.
  5. Remove the purge solenoid valve bracket.
  6. Disconnect the purge line (1) from the intake manifold (2).
    7. Fig 3: View of Throttle Body Harness and Retainer
    GM1977918Courtesy of GENERAL MOTORS CORP.
  7. Remove the throttle body harness electrical harness retainer (1).
  8. Disconnect the throttle body electrical connector (2).
    9. Fig 4: View of Intake Manifold Brace Assembly
    GM1977964Courtesy of GENERAL MOTORS CORP.
  9. Remove the intake manifold brace bolts (1).
  10. Remove the intake manifold brace.
    11. Fig 5: Identifying PCV Dirty Air Tube
    GM1977217Courtesy of GENERAL MOTORS CORP.
  11. Disconnect the positive crankcase ventilation (PCV) hose (1) from the intake manifold (3).
    12. Fig 6: View of Intake Manifold Rear Heat Shield Bolts
    GM1977980Courtesy of GENERAL MOTORS CORP.
  12. Unclip the engine harness from the left side of the intake manifold.
  13. Remove the intake manifold rear heat shield bolts (1).
    14. Fig 7: Identifying Intake Manifold Bolts
    GM1978050Courtesy of GENERAL MOTORS CORP.
  14. Remove the intake manifold bolts (1). Some deflection of the cowl panel may be necessary to extract the right rear bolt.
  15. Remove the intake manifold with the throttle body.
  16. If the intake manifold is being replaced, disassemble the intake manifold. Refer to Intake Manifold Disassemble (LY7) or Intake Manifold Disassemble (LLT) .
  17. Clean and inspect the intake manifold. Refer to Intake Manifold Cleaning and Inspection (LY7) or Intake Manifold Cleaning and Inspection (LLT) .
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