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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1343 (ENGINE CONTROL SYSTEM (INTRODUCTION) -- 1.8L (LNK))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 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Engine Upper Cover
    GM828878Courtesy of GENERAL MOTORS CORP.
  1. Remove the four fasteners from the engine cover (1).
  2. Remove the engine cover (1) from the engine.
    3. Fig 2: Removing Quick Connect Coupling Cover
    GM236747Courtesy of GENERAL MOTORS CORP.
  3. Relieve the fuel pressure. Refer to Fuel Pressure Relief Procedure .
  4. Remove the quick connect coupling cover.
  5. Disconnect the coupling for the fuel feed hose from the fuel feed pipe of the fuel rail using the J 43178  . See Special Tools and Equipment . Use a shop towel in order to catch any remaining fuel that may leak. Refer to Quick Connect Fitting(s) Service (Metal Collar) .
    6. Fig 3: PCV Hose, Breather Hose, EVAP Hose
    GM850214Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the PCV hose (1) from the PCV valve.
  7. Disconnect the PCV breather hose (2).
  8. Disconnect the EVAP hose (3).
  9. Swing the two PCV hoses and the EVAP hose away from the cylinder head
  10. Remove the bolt to the ignition coil wire harness bracket.
  11. Disconnect the electrical connectors to the four fuel injectors.
    12. Fig 4: Fuel Rail, Spacers And Fastener
    GM828881Courtesy of GENERAL MOTORS CORP.
  12. Remove the fastener (1) from the fuel supply pipe bracket.
  13. Remove the two fasteners (4) from the fuel rail (3).
  14. Remove the fuel rail (3) and the spacers (2) from the engine.
    15. Fig 5: Fuel Injectors, New Grommets And O-Rings
    GM828884Courtesy of GENERAL MOTORS CORP.
  15. Remove the fuel injectors (1) with the O-rings (3) and with the grommets (2) from the fuel rail or cylinder head.
RENDER: 1.0x

NO RELATED

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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.