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Home >> GMC >> 2021 >> Yukon AT4 >> Repair and Diagnosis >> Engine Mechanical >> Exhaust System >> Repair Instructions >> Exhaust Back Pressure Valve Replacement >> Installation Procedure

Installation Procedure

  1. GM5207985Courtesy of GENERAL MOTORS COMPANY

    Exhaust Gas Recirculation Valve Inlet Gasket (2) - Install NEW

  2. GM5721076Courtesy of GENERAL MOTORS COMPANY

    Turbocharger Coolant Feed and Return Pipe Gasket (1) - Install NEW

  3. GM5207985Courtesy of GENERAL MOTORS COMPANY

    Exhaust Back Pressure Valve (1) - Install

  4. GM5207981Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

    Catalytic Converter Nut (1) - Install and tighten [ 3x ] - Fastener Specifications 

  5. GM5721089Courtesy of GENERAL MOTORS COMPANY

    Exhaust Gas Recirculation Valve Cooling Return Hose (2) - Install

  6. Exhaust Gas Recirculation Coolant Return Pipe Bolt (1) - Install and tighten [ 2x ] - Fastener Specifications
  7. GM5207793Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector (1) @ Exhaust Back Pressure Valve - Connect

  8. Connect the wiring harness retainers.
  9. GM5184846Courtesy of GENERAL MOTORS COMPANY

    Exhaust System Front Gasket (2) - Install NEW

  10. Nitrogen Oxides Catalytic Converter (1) - Install
  11. GM5341378Courtesy of GENERAL MOTORS COMPANY

    Exhaust Front Pipe Nut (1) - Install and tighten [ 2x ] - Fastener Specifications 

  12. GM5721112Courtesy of GENERAL MOTORS COMPANY

    Catalytic Converter Brace Bracket (1) - Install

  13. GM5340362Courtesy of GENERAL MOTORS COMPANY

    Exhaust Front Pipe Nut (1) - Install [ 2x ] - Fastener Specifications 

  14. GM5341429Courtesy of GENERAL MOTORS COMPANY

    Exhaust Pipe Clamp (1) - Tighten - Fastener Specifications 

  15. GM5151789Courtesy of GENERAL MOTORS COMPANY

    Coat the threads with anti-seize compound. Adhesives, Fluids, Lubricants, and Sealers

  16. Exhaust Particulate Sensor (1) - Install and tighten - Fastener Specifications
  17. GM5150652Courtesy of GENERAL MOTORS COMPANY

    Coat the threads with anti-seize compound. Adhesives, Fluids, Lubricants, and Sealers

  18. Nitrogen Oxides Sensor- Position 3 (1) - Install and tighten - Fastener Specifications
  19. GM5149436Courtesy of GENERAL MOTORS COMPANY

    Coat the threads with anti-seize compound. Adhesives, Fluids, Lubricants, and Sealers

  20. Nitrogen Oxides Sensor- Position 2 (1) - Install and tighten - Fastener Specifications
  21. Lower the vehicle.
  22. GM5721090Courtesy of GENERAL MOTORS COMPANY

    Wiring Harness Retainer (2) - Install

  23. Catalytic Converter Brace Bracket Nut (1) - Install and tighten [ 2x ] - Fastener Specifications 
  24. Front Wheelhouse Liner- Right Side - Install - Front Wheelhouse Liner Replacement
  25. Fill the cooling system to the proper level. Cooling System Draining and Filling (GE 47716 L84, L87) , or Cooling System Draining and Filling (Static L84, L87) , or Cooling System Draining and Filling (Static LM2) , or Cooling System Draining and Filling (GE 47716 LM2)
  26. Start the engine and check for coolant leaks.
  27. Inspect the exhaust system for leaks.