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Home >> GMC >> 2005 >> Sierra 1500 HD, RWD >> 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 >> Removal Procedure

Removal 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. Turn the ignition OFF.
  2. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .
    3. Fig 1: View Of Air Inlet Duct
    GM1305320Courtesy of GENERAL MOTORS CORP.
  3. Remove the air inlet duct. Refer to Air Cleaner Intake Duct Replacement in Engine Controls - 3.6L (LY7).
  4. Disconnect the brake booster vacuum hose from the intake manifold.
    5. Fig 2: View Of Purge Solenoid Valve And Electrical Connector
    GM887878Courtesy of GENERAL MOTORS CORP.
  5. Disconnect the purge solenoid valve electrical connector.
    6. Fig 3: Top Of Engine View
    GM1348201Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the purge line (3) from the purge solenoid valve.
    7. Fig 4: View Of Wiring Harness Conduit
    GM1285256Courtesy of GENERAL MOTORS CORP.
  7. Remove the wiring harness retainer.
    8. Fig 5: View Of Throttle Body Electrical Connector
    GM887881Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the throttle body electrical connector.
    9. Fig 6: View Of Upper Intake Manifold Brace Stud, Bolt, And Brace
    GM1522522Courtesy of GENERAL MOTORS CORP.
  9. Remove the upper intake manifold brace stud (1), bolt (2), and brace.
  10. Disconnect the positive crankcase ventilation (PCV) hose from the right bank camshaft cover.
    11. Fig 7: Identifying Barometric Pressure Sensor And Electrical Connector
    GM945437Courtesy of GENERAL MOTORS CORP.
  11. Disconnect the barometric pressure sensor electrical connector.
    12. Fig 8: View Of Communicator And Intake Manifold Runner Control Solenoid Electrical Connectors
    GM945390Courtesy of GENERAL MOTORS CORP.
  12. Disconnect the intake manifold runner control solenoid electrical connector.
    13. Fig 9: View Of Injector Harness Bracket Bolt
    GM1318829Courtesy of GENERAL MOTORS CORP.
  13. Remove the injector harness bracket bolt.
  14. Remove the left bank ignition coil wiring harness from the bracket.
    15. Fig 10: View Of Upper Intake Manifold
    GM1285188Courtesy of GENERAL MOTORS CORP.
  15. Remove the upper intake manifold bolts. Some deflection of the cowl panel may be necessary to extract the right rear bolt.
  16. Remove the upper intake manifold with the throttle body.
  17. If the upper intake manifold is being replaced, disassemble the intake manifold. Refer to Intake Manifold Disassemble .
  18. Clean and inspect the intake manifold. Refer to Intake Manifold Cleaning and Inspection .
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