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Home › Cadillac › 2021 › CT4 Sport, RWD › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 2.0L (LSY) - Repair Instructions › Repair Instructions › Fuel Injection Fuel Rail Assembly Replacement › Installation Procedure

Installation Procedure

  1. GM5034357Courtesy of GENERAL MOTORS COMPANY

    Install the EN-50791-100  Fuel Injector Installation Adapter (2) to the EN-50791  Injector to Rail Installer (1).

  2. Install EN-50791  Injector to Rail Installer (1) to the fuel injector (3).
  3. GM5034363Courtesy of GENERAL MOTORS COMPANY

    Using EN-50791  Injector to Rail Installer (1), compress the fuel injector (4) into the fuel rail.

    4. NOTE:

    Ensure the fuel injector is fully seated in the fuel rail.

  4. Fuel Injector Retainer (3) - Install NEW
  5. Ensure the NEW fuel injector retainer (3) is fully seated in the fuel rail.
  6. Remove the EN-50791  Injector to Rail Installer (1) along with the EN-50791-100  Fuel Injector Installation Adapter (2).
  7. GM5779682Courtesy of GENERAL MOTORS COMPANY

    Direct Fuel Injector Hold Down Clamp (1) - Install NEW

  8. GM4840511Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    DO NOT use any type of lubricant when installing the NEW combustion seals on the fuel injector tip.

    Install EN-51955-1  long protector (1) onto the fuel injector tip, covering the first recessed area closest to the tip. Place a NEW fuel injector nozzle housing seal (2) on EN-51955-1  long protector (1).

  9. Using EN-51955-4  pusher (3), install the fuel injector nozzle housing seal (2) into the recessed area (4) of the fuel injector, then remove the EN-51955-1  long protector.
  10. Compress the fuel injector nozzle housing seal (2) using EN-51955-3  pre-sizer (5).
  11. Using EN-51955-5  sizer (6), resize the fuel injector nozzle housing seal.
  12. Install EN-51955-2  short protector (7) onto the fuel injector tip. Place a second NEW fuel injector nozzle housing seal (8) on EN-51955-2  short protector (7).
  13. Using EN-51955-4  pusher (3), install the fuel injector nozzle housing seal (8) into the remaining recessed area (9) of the fuel injector, then remove EN-51955-2  short protector.
  14. Compress the fuel injector nozzle housing seal (8) using EN-51955-3  pre-sizer (5).
  15. Using EN-51955-5  sizer (6), resize the fuel injector nozzle housing seal.
  16. Connect the direct fuel injector electrical connector.
  17. GM5845930Courtesy of GENERAL MOTORS COMPANY

    Fuel Injection Fuel Rail Fuel Pressure Sensor - Install and hand tighten

  18. Fuel Injection Fuel Rail Fuel Pressure Sensor - Remove
  19. Re-lubricate the bore, threads, and sealing area.
  20. Fuel Injection Fuel Rail Fuel Pressure Sensor - Install and tighten - Fastener Specifications
  21. Remove Direct Fuel Injection Fuel Rail in Vice.
  22. GM5311583Courtesy of GENERAL MOTORS COMPANY

    Fuel Injector Wiring Harness (1) - Install

  23. Electrical Connector @ Direct Fuel Injector - Connect [4x]
  24. Electrical Connector @ Fuel Injection Fuel Rail Fuel Pressure Sensor - Connect
  25. GM4995644Courtesy of GENERAL MOTORS COMPANY

    Clean the fuel injector bores.

    26. NOTE:

    Hand place the NEW fuel injection fuel rail into position on the cylinder head.

  26. Direct Fuel Injection Fuel Rail (1) - Install
  27. GM4995756Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Install the four fuel injection fuel rail bolts hand tight only, DO NOT apply any torque.

    Fuel Injection Fuel Rail Bolt (1, 2, 3) - Install [4x]

  28. Tighten the two outer fuel injection fuel rail bolts (1, 3) alternating in steps of 1/2 turn, until the direct fuel injection fuel rail (4) is fully seated.
    29. CAUTION:

    Refer to Fastener Caution .

  29. Fuel Injection Fuel Rail Bolt (1, 2, 3) - Tighten [4x] - Fastener Specifications
  30. Electrical Connector (5, 6) - Connect [2x]
  31. GM5314508Courtesy of GENERAL MOTORS COMPANY

    Fuel Feed Intermediate Pipe (2) - Install NEW

    32. CAUTION:

    Refer to Component Fastener Tightening Caution .

  32. Nut @ Fuel Feed Intermediate Pipe (2) - Tighten [2x] - Fastener Specifications
  33. Fuel Injection Fuel Feed Pipe Bolt (1) - Install - Fastener Specifications
  34. Position the wiring harness. @ Fuel Pump
  35. GM5299635Courtesy of GENERAL MOTORS COMPANY
    WARNING:

    The noise cancelling foam component MUST be replaced if it has been exposed to engine fluids. Failure to replace the noise cancelling foam component that has been exposed to engine fluids may result in an engine fire resulting in catastrophic engine damage, and possible injury or death.

    Fuel Injection Fuel Rail Insulator (1) - Install

  36. GM4995197Courtesy of GENERAL MOTORS COMPANY

    Wiring Harness (2) @ Fuel Injection Fuel Rail Insulator (1) - Install

  37. GM5123952Courtesy of GENERAL MOTORS COMPANY

    Water Outlet Seal (2) - Install NEW

  38. Engine Coolant Flow Control Valve (1) - Install
  39. GM5123951Courtesy of GENERAL MOTORS COMPANY

    Engine Coolant Flow Control Valve Bolt (1) - Install [4x] - Fastener Specifications

  40. GM5123949Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector (2) @ Engine Coolant Temperature Sensor - Connect

  41. Electrical Connector (1) @ Engine Coolant Flow Control Valve - Connect [2x]
  42. GM5123948Courtesy of GENERAL MOTORS COMPANY

    Engine Oil Cooler Coolant Inlet Hose (4) @ Engine Coolant Flow Control Valve - Install

  43. Engine Coolant Air Bleed Hose (3) @ Engine Coolant Flow Control Valve - Install
  44. Engine Coolant Air Bleed Hose (2) @ Engine Coolant Flow Control Valve - Install
  45. Hose Clamp (1) - Engage [3x] - Hose Clamp Replacement Guidelines - Spring Type
  46. GM5123947Courtesy of GENERAL MOTORS COMPANY

    Radiator Inlet Hose (3) @ Engine Coolant Flow Control Valve - Install

  47. Thermostat Bypass Hose (2) @ Engine Coolant Flow Control Valve - Install
  48. Hose Clamp (1) - Engage [2x] - Hose Clamp Replacement Guidelines - Spring Type
  49. GM5087317Courtesy of GENERAL MOTORS COMPANY

    Intake Manifold Gasket (2) - Install NEW

  50. GM5454734Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Check that the 2 pins (4) of the intake manifold are seated correctly in the cylinder head.

    Intake Manifold (3) - Install

  51. Intake Manifold Bolt - Install, but do NOT tighten [7x]
  52. Charge Air Cooler Outlet Air Tube (2) @ Throttle Body - Install
  53. Electrical Connector @ Throttle Body (1) - Connect
  54. Fig 1: Intake Manifold Bolts Tightening Sequence
    GM5087340Courtesy of GENERAL MOTORS COMPANY

    Intake Manifold Bolt (1) - Tighten in sequence [7x] - Fastener Specifications

  55. GM5420336Courtesy of GENERAL MOTORS COMPANY
  56. Reposition and connect the intake air pressure and temperature sensor electrical connector (1).
  57. GM5512539Courtesy of GENERAL MOTORS COMPANY

    Radiator Surge Tank Inlet Pipe Bracket (2) - Reposition [2x]

  58. Radiator Surge Tank Outlet Hose Clip Bracket Nut (1) - Tighten [2x] - Fastener Specifications
  59. GM5137171Courtesy of GENERAL MOTORS COMPANY

    Reposition the wiring harness (3) and connect as necessary.

  60. Retainer (1) @ Intake Manifold (2) - Install [7x]
  61. GM5117362Courtesy of GENERAL MOTORS COMPANY

    Evaporative Emission Canister Purge Pump (2) - Install

  62. Evaporative Emission Canister Purge Pump Bolt (1) - Install and tighten [3x] - Fastener Specifications
  63. Connect the electrical connector.
  64. GM5318338Courtesy of GENERAL MOTORS COMPANY

    Evaporative Emission Pipe (1) - Install

  65. Connect the quick connect. Plastic Collar Quick Connect Fitting Service 
  66. GM5448536Courtesy of GENERAL MOTORS COMPANY

    Evaporative Emission Canister Purge Tube (2) - Install

  67. Connect the evaporative emission canister purge tube quick connects (1). Plastic Collar Quick Connect Fitting Service 
  68. Connect the evaporative emission canister purge tube (2) to the retainer (3).
  69. GM5137016Courtesy of GENERAL MOTORS COMPANY

    Upper Intake Manifold Bracket (2) - Install

  70. Upper Intake Manifold Cover Nut (1) - Install and tighten [2x] - Fastener Specifications
  71. GM5137013Courtesy of GENERAL MOTORS COMPANY

    Upper Intake Manifold Cover Bracket Bolt (1) @ Upper Intake Manifold Bracket (2) - Install and tighten [2x] - Fastener Specifications

  72. GM5137012Courtesy of GENERAL MOTORS COMPANY

    Wiring Harness (4) - Reposition

  73. Retainer (2) @ Upper Intake Manifold Bracket (3) - Install [3x]
  74. Electrical Connector (1) - Connect [3x]
  75. GM5068106Courtesy of GENERAL MOTORS COMPANY

    Oil Level Indicator Tube O-Ring (2) - Install NEW

  76. Oil Level Indicator Tube (1) - Install
  77. GM5136547Courtesy of GENERAL MOTORS COMPANY

    Oil Level Indicator Tube Bracket Bolt (1) - Install - Fastener Specifications

  78. Electrical Connector (1) @ Oil Level Indicator (3) - Install
  79. GM5335764Courtesy of GENERAL MOTORS COMPANY

    Oil Level Indicator (1) - Install

  80. GM5335089Courtesy of GENERAL MOTORS COMPANY

    Intake Manifold Cover (1) @ Upper Intake Manifold Bracket (2) - Install

  81. GM5335087Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Ensure the engine sight shield retainers fully engage the intake manifold cover studs.

    Push down on the front of the intake manifold cover (1).

  82. Install the oil fill cap.
  83. Connect the battery. - Battery Negative Cable Disconnection and Connection
  84. Fill the cooling system. Cooling System Draining and Filling (LSY GE 47716) , or Cooling System Draining and Filling (LSY Static Fill) , or Cooling System Draining and Filling (LSY with V03 Static Fill) , or Cooling System Draining and Filling (LSY with V03 GE 47716)
  85. Pressurize the fuel system and inspect for leaks.
  86. Perform the throttle body idle air flow compensation reset. Throttle Body Idle Air Flow Compensation Reset 
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