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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1913 (ENGINE CONTROLS AND FUEL - 3.6L (LCS) - INTRODUCTION)REPAIR INSTRUCTIONSFUEL INJECTOR REPLACEMENTREMOVAL PROCEDURE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Removal Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal Procedure
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Relieve the high side fuel system pressure. Refer to Fuel Pressure Relief (with CH 48027-100) or Fuel Pressure Relief (w/o CH 48027-100) .
  2. Remove the drive motor generator power inverter module. Refer to Drive Motor Generator Power Inverter Module Removal and Installation
    3. NOTE: The fuel injectors have an alignment feature, note the position of the injectors alignment for installation.
  3. Remove the fuel injection fuel rail assembly. Refer to Fuel Injection Fuel Rail Assembly Replacement - Bank 1  or Fuel Injection Fuel Rail Assembly Replacement - Bank 2 .
    4. Fig 1: Fuel Injector Retaining Rings
    GM2004445Courtesy of GENERAL MOTORS CORP.
  4. Remove and discard the three fuel injector retaining rings (1).
    5. Fig 2: Direct Fuel Injectors, Harness And Electrical Connector
    GM2004498Courtesy of GENERAL MOTORS CORP.
  5. Remove the direct fuel injectors and harness (1) as an assembly, and disconnect the electrical connector (2). If necessary, use the J 2619-01  with the J-37281-A  in order to remove the direct fuel injectors evenly. See Special Tools .
    6. Fig 3: Identifying Fuel Injector Components
    GM1977756Courtesy of GENERAL MOTORS CORP.
  6. Remove and discard the following components from the fuel injectors (4).
    • Upper O-ring Seal (1)
    • Plastic Spacer (2)
    • Retaining Ring (3)
    • Isolator Cup (5)
    • Teflon Seal (6)
  7. Inspect the fuel rail injector bores and clean with J 39313  , and EN-47909  , if required. See Special Tools .
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.