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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1785 (ENGINE CONTROLS AND FUEL - 2.2L (L61) - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSSPARK PLUG 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 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Outlet Resonator/Duct Assembly
    GM898897Courtesy of GENERAL MOTORS CORP.
  1. Disconnect the intake air temperature (IAT) sensor connector.
  2. Loosen the clamp at the air cleaner assembly.
  3. Remove the push-pin attachment from the outlet resonator/duct assembly to support bracket.
  4. Loosen the clamp at the throttle body assembly.
  5. Disconnect the positive crankcase ventilation (PCV) fresh air bent hose at the cam cover.
  6. Remove the outlet resonator/duct assembly.
  7. Disconnect the EI module electrical connector.
    8. Fig 2: View of Ignition Module Housing Assembly With Spark Plug Boots
    GM951506Courtesy of GENERAL MOTORS CORP.
  8. Remove the ignition module attachment bolts.
  9. Remove the ignition module housing assembly with the spark plug boots from the spark plugs.
    10. Fig 3: View Of Spark Plugs
    GM895073Courtesy of GENERAL MOTORS CORP.
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.