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Home >> Cadillac >> 2023 >> CT4 V, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.7L - Repair Instructions >> Repair Instructions >> Fuel Injector Replacement >> Installation Procedure

Installation Procedure

  1. GM5780054Courtesy of GENERAL MOTORS COMPANY

    Fuel Injector Bushing (1) - Install NEW

  2. GM5064709Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Use a lint free swab to apply the lubrication to the O-ring before installation.

    Holding the largest diameter/body of the fuel injector (2), insert the injector assembly (2) into the fuel rail. Ensure correct orientation of the electrical connector.

  3. CAUTION:

    Ensure the fuel injector retainer is properly installed. Failure to completely install the retainers may degrade fuel injection system performance or cause system malfunction.

  4. Fuel Injector Retainer (1) - Install NEW
  5. GM5064708Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    When installing the connectors, ensure the connector position assurance (CPA) tab is engaged for each connector.

    Install the fuel injector wiring harness (2) and connect to appropriate fuel injectors and fuel pressure sensor.

  6. Install NEW fuel injector wiring harness tie straps (1).
  7. GM4840511Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    DO NOT use any type of lubricant when installing the NEW fuel injector nozzle housing 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).

  8. 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.
  9. Compress the fuel injector nozzle housing seal (2) using EN-51955-3  Pre-Sizer (5).
  10. Using EN-51955-5  Sizer (6), resize the fuel injector nozzle housing seal.
  11. Install EN-51955-2  Short Protector (7) onto the fuel injector tip. Place a second NEW fuel injector nozzle housing seal (8) on EN-51105-2  Short Protector (7).
  12. 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-51105-2  Short Protector.
  13. Compress the fuel injector nozzle housing seal (8) using EN-51955-3  Pre-Sizer (5).
  14. Using EN-51955-5  Sizer (6), resize the fuel injector nozzle housing seal.
  15. GM5133846Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    During the installation of the fuel rail and injector assembly, ensure that the fuel injectors are positioned straight into the injector opening. Failure to follow this caution can tilt or bend the injectors and could cause leaks or malfunction after installation.

    NOTE:

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

    Fuel Injection Fuel Rail (1) - Move into position

  16. NOTE:

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

  17. Fuel Injection Fuel Rail Bolt (2) - Install and hand tighten [4x]
  18. Tighten the two outer fuel injection fuel rail bolts by alternating in steps of 1/2 turn, until the fuel injection fuel rail (1) is fully seated.
  19. CAUTION:

    Refer to Fastener Caution .

  20. Fuel Injection Fuel Rail Bolt (2) - Tighten [4x] - Fastener Specifications
  21. Electrical Connector (3) - Connect [3x]
  22. GM5132483Courtesy 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 canceling 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 Noise Shield (1) - Install

  23. GM5404599Courtesy of GENERAL MOTORS COMPANY

    Fuel Feed Intermediate Pipe (2) - Install NEW

  24. Nut @ Fuel Feed Intermediate Pipe - Install and hand tighten [2x]
  25. Fuel Injection Fuel Feed Pipe Bracket Bolt (1) - Install and tighten - Fastener Specifications
  26. GM5404598Courtesy of GENERAL MOTORS COMPANY

    Nut @ Fuel Feed Intermediate Pipe (1) - Tighten [2x] - Fastener Specifications

  27. GM5399689Courtesy of GENERAL MOTORS COMPANY

    Engine Coolant Flow Control Valve Seal (2) - Install NEW

  28. Engine Coolant Flow Control Valve (1) - Install
  29. GM5399685Courtesy of GENERAL MOTORS COMPANY

    Engine Coolant Flow Control Valve Bolt (1) - Install [5x] - Fastener Specifications

  30. GM5399683Courtesy of GENERAL MOTORS COMPANY

    Electrical Connector (2) @ Engine Coolant Flow Control Valve - Connect [2x]

  31. Electrical Connector (1) @ Engine Coolant Temperature Sensor - Connect
  32. GM5399673Courtesy of GENERAL MOTORS COMPANY

    Engine Coolant Thermostat Housing Inlet Pipe (3) @ Engine Coolant Flow Control Valve - Install

  33. Exhaust Manifold Outlet Pipe (2) @ Engine Coolant Flow Control Valve - Install
  34. Hose Clamp (1) - Engage [2x] - Hose Clamp Replacement Guidelines - Spring Type
  35. GM5399671Courtesy of GENERAL MOTORS COMPANY

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

  36. Radiator Inlet Hose (3) @ Engine Coolant Flow Control Valve - Install
  37. Thermostat Bypass Pipe (2) @ Engine Coolant Flow Control Valve - Install
  38. Hose Clamp (1) - Engage [3x] - Hose Clamp Replacement Guidelines - Spring Type
  39. GM5045008Courtesy of GENERAL MOTORS COMPANY

    Crankcase Vent Passage Seal (4) - Install NEW

  40. Intake Manifold Gasket (3) - Install NEW [4x]
  41. GM5507557Courtesy of GENERAL MOTORS COMPANY

    Intake Manifold (1) - Install

  42. GM5508646Courtesy of GENERAL MOTORS COMPANY

    Intake Manifold Bolt (1) - Install and tighten [6x] - Fastener Specifications

  43. GM5507451Courtesy of GENERAL MOTORS COMPANY

    Retainer (1) - Install

  44. GM5399157Courtesy of GENERAL MOTORS COMPANY

    Charge Air Cooler Outlet Air Tube (2) @ Throttle Body (3) - Install

  45. Retainer Spring (1) - Engage
  46. GM5507441Courtesy of GENERAL MOTORS COMPANY

    Upper Intake Manifold Cover (1) - Install

  47. GM5507437Courtesy of GENERAL MOTORS COMPANY

    Intake Manifold Cover Stud (2) - Install and tighten [3x] - Fastener Specifications

  48. Intake Manifold Cover Bolt (1) - Install and tighten [2x] - Fastener Specifications
  49. GM5402098Courtesy of GENERAL MOTORS COMPANY

    Evaporative Emission Canister Purge Pump (2) - Install

  50. Evaporative Emission Canister Purge Pump Bolt (1) - Install and tighten [3x] - Fastener Specifications
  51. GM5504108Courtesy of GENERAL MOTORS COMPANY

    Engine Wiring Harness (4) - Reposition

  52. Retainer (3) - Install [4x]
  53. Electrical Connector (2) - Connect [2x]
  54. Engine Wiring Harness Bolt (1) - Install and tighten - Fastener Specifications
  55. GM5509132Courtesy of GENERAL MOTORS COMPANY

    Throttle Body Electrical Connector (1) - Connect

  56. GM5504095Courtesy of GENERAL MOTORS COMPANY

    Radiator Surge Tank Inlet Hose (3) - Reposition

  57. Retainer (2) - Install [3x]
  58. Evaporative Emission Canister Purge Tube (1) - Connect
  59. GM5504092Courtesy of GENERAL MOTORS COMPANY

    Evaporative Emission Pipe (2) - Connect

  60. Fuel Feed Pipe (1) - Connect
  61. GM5456829Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Ensure the intake manifold cover insulator retainers fully engage the intake manifold cover studs.

    Intake Manifold Cover Insulator (1) - Install

  62. GM5456746Courtesy of GENERAL MOTORS COMPANY

    Intake Manifold Cover Bolt (1) - Install and tighten - Fastener Specifications

  63. GM5432174Courtesy of GENERAL MOTORS COMPANY

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

  64. GM5432171Courtesy of GENERAL MOTORS COMPANY

    Push down on the front of the intake manifold cover (2).

  65. Intake Manifold Cover Bolt (1) - Install and tighten [2x] - Fastener Specifications
  66. Install the oil fill cap.
  67. GM5517311Courtesy of GENERAL MOTORS COMPANY

    Oil Level Indicator Tube (1) - Install

  68. GM5517312Courtesy of GENERAL MOTORS COMPANY

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

  69. GM5517313Courtesy of GENERAL MOTORS COMPANY

    Oil Level Indicator (1) - Install

  70. Connect the battery negative cable. Battery Negative Cable Disconnection and Connection
  71. Fill the cooling system. Cooling System Draining and Filling (L3B Static Fill) , or Cooling System Draining and Filling (L3B GE 47716)
  72. Pressurize the fuel system and inspect for leaks.
    1. Turn ON the ignition with the engine OFF for 2 seconds.
    2. Turn OFF the ignition for 10 seconds.
    3. Turn ON the ignition with the engine OFF.
    4. Inspect for fuel leaks.
  73. Perform the intake system learned values reset. Intake System Learned Values Reset 
  74. Perform the throttle body idle air flow compensation reset. Throttle Body Idle Air Flow Compensation Reset