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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1343 (ENGINE CONTROL SYSTEM (INTRODUCTION) -- 1.8L (LNK))REPAIR INSTRUCTIONSIGNITION COIL(S) 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/Installing Ignition Coils And Bolt
    GM830280Courtesy of GENERAL MOTORS CORP.
  3. Disconnect the 4 electrical connectors from the ignition coils (3).
  4. Remove the fasteners (4) from the ignition coils.
  5. Remove the fasteners (2) from the electrical harness (1).
  6. Remove the electrical harness package (1).
  7. Remove the ignition coils (3) from the 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.