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Home >> GMC >> 2021 >> Yukon XL AT4 >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 5.3L (L84) Or 6.2L (L87) - Repair Instructions (10 Of 12) >> Repair Instructions >> Intake Manifold Replacement (L87) >> Installation Procedure

Installation Procedure

  1. GM5541475Courtesy of GENERAL MOTORS COMPANY

    Evaporative Emission Canister Purge Solenoid Valve (3) - Install

  2. CAUTION:

    Refer to Fastener Caution .

  3. Evaporative Emission Canister Purge Solenoid Valve Bolt (4) - Install and tighten - Fastener Specifications
  4. Manifold Absolute Pressure Sensor (2) - Install
  5. Manifold Absolute Pressure Sensor Bolt (1) - Install and tighten - Fastener Specifications
  6. GM5541483Courtesy of GENERAL MOTORS COMPANY

    Throttle Body Gasket (3) - Install NEW

  7. Throttle Body (2) - Install
  8. Throttle Body Bolt (1) - Install and hand tighten [ 4x ]
  9. Throttle Body Bolt (1) - Tighten [ 4x ] - Fastener Specifications
  10. GM5540992Courtesy of GENERAL MOTORS COMPANY

    Intake Manifold Cover (2) - Install

  11. Intake Manifold Cover Bolt (1) - Install and hand tighten [ 4x ]
  12. Intake Manifold Cover Bolt (1) - Tighten [ 4x ] - Fastener Specifications
  13. Remove the covers from the cylinder head passages.
  14. GM5541471Courtesy of GENERAL MOTORS COMPANY

    Intake Manifold Gasket (1) - Install NEW [ 8x ]

  15. GM5540978Courtesy of GENERAL MOTORS COMPANY

    Clean all sealing surfaces.

  16. If NEW threaded components are being installed, loosen the adhesive using a metal pick or similar tool before proceeding. If threaded components are reused, prepare the threaded components using the following steps:
    1. Remove any loose cured adhesive from the external threads of the components using a lint free cloth.
    2. Thread the cleaned components into the internal mating threads and remove to loosen trapped cured adhesive.
    3. Apply thread locking adhesive to the external threads of the components. Adhesives, Fluids, Lubricants, and Sealers
    4. Ensure there are no gaps in the thread locking adhesive once applied to the component.
  17. NOTE:

    The aid of an assistant may be helpful in holding the engine harness up out of the way so the upper intake manifold cover does not get caught against the engine harness.

  18. Position the intake manifold and Intake manifold cover (1) to install harness retainers.
  19. GM5540975Courtesy of GENERAL MOTORS COMPANY

    Engine Wiring Harness Retainer (1) @ Intake Manifold Cover (2) - Install [ 4x ]

  20. Move the intake manifold and intake manifold cover (2) into place.
  21. GM5540977Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Some components not shown for graphic clarity.

    Intake Manifold Bolt (1) - Hand tighten [ 10x ]

  22. Intake Manifold Bolt (1) - Tighten in sequence [ 10x ] - Fastener Specifications
  23. GM5647507Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Some components not shown for graphic clarity.

    Positive Crankcase Ventilation Tube Connector (1) @ Intake Manifold - Install - Plastic Collar Quick Connect Fitting Service

  24. GM5540974Courtesy of GENERAL MOTORS COMPANY

    Engine Wiring Harness Retainer (1) @ Intake Manifold Cover (2) - Install [ 3x ]

  25. GM5540973Courtesy of GENERAL MOTORS COMPANY

    Engine Wiring Harness Retainer (1) @ Intake Manifold Cover (2) - Install [ 4x ]

  26. GM5540971Courtesy of GENERAL MOTORS COMPANY

    Engine Wiring Harness Connector (4) @ Evaporative Emission Canister Purge Solenoid Valve - Connect

  27. Engine Wiring Harness Connector (3) @ Manifold Absolute Pressure Sensor - Connect
  28. Engine Wiring Harness Retainer (2) @ Intake Manifold Cover - Install [ 2x ]
  29. Engine Wiring Harness Connector (1) @ Throttle Body - Connect
  30. GM5538400Courtesy of GENERAL MOTORS COMPANY

    Evaporative Emission Canister Purge Tube (2) @ Evaporative Emission Canister Purge Solenoid Valve - Install

  31. Evaporative Emission Canister Purge Tube Connector (1) @ Evaporative Emission Canister Purge Solenoid Valve - Engage - Plastic Collar Quick Connect Fitting Service
  32. GM5571687Courtesy of GENERAL MOTORS COMPANY

    Plenum Front Panel Outer Reinforcement (1) - Install - Plenum Front Panel Outer Reinforcement Removal and Installation

  33. GM5001379Courtesy of GENERAL MOTORS COMPANY

    Air Cleaner Outlet Duct (3) - Install

  34. Air Cleaner Outlet Duct Clamp (2) - Tighten [ 2x ] - Fastener Specifications
  35. Positive Crankcase Ventilation Fresh Air Tube (1) - Connect - Plastic Collar Quick Connect Fitting Service
  36. GM5001375Courtesy of GENERAL MOTORS COMPANY

    Air Cleaner Outlet Duct Bracket Bolt (1) - Install and tighten - Fastener Specifications

  37. Install engine wiring harness to air cleaner outlet duct bracket.