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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 636 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSEXHAUST SYSTEM 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 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Servicing of the catalytic converter, resonator or pipe requires the replacement of the exhaust system as a complete one-piece unit.

  1. Raise and support the vehicle.
  2. Remove the oxygen sensor wiring harness heat shield. Refer to Oxygen Sensor Wiring Harness Heat Shield Replacement .
  3. Disconnect the heated oxygen sensor at the pigtail.
  4. Remove the heated oxygen sensor if replacement is necessary. Refer to DOWNSTREAM HEATED OXYGEN SENSOR .
  5. Remove the four nuts securing the catalytic converter to the exhaust manifold pipe.
  6. Remove the catalytic converter gasket. Do not reuse the gasket.
  7. Suitably support the exhaust system.
    Fig 1: Removing Catalytic Converter From Exhaust Manifold Pipe
    G01818228Courtesy of GENERAL MOTORS CORP.
  8. Remove the two bolts securing the center exhaust hangers to the rear suspension support brackets.
    Fig 2: Removing Center Exhaust Hangers Bolts
    G01818229Courtesy of GENERAL MOTORS CORP.
  9. Remove the two bolts securing the rear exhaust hanger brackets to the rear compartment rails.
  10. With the aid of an assistant, Lower the exhaust system.
    Fig 3: Removing Exhaust System
    G01818230Courtesy of GENERAL MOTORS CORP.
  11. Remove the two nuts securing the rear exhaust hangers to the rear exhaust hanger brackets.
  12. Remove the rear exhaust hanger brackets from the rear exhaust hangers.
    Fig 4: Removing Rear Exhaust Hanger Brackets From Rear Exhaust Hangers
    G01818231Courtesy 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.