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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2267 (ENGINE EXHAUST SYSTEM)REPAIR INSTRUCTIONSCATALYTIC CONVERTER REPLACEMENT - RIGHT SIDEINSTALLATION PROCEDURE
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Installation Procedure

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Installation Procedure
WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install the oxygen sensor to the catalytic converter. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 .
    2. NOTE: Do not reuse the catalytic converter inlet seal/heat shield. Always replace with new.
  2. Install the NEW catalytic converter seal/heat shield to the catalytic converter.
    3. Fig 1: Catalytic Converter Nuts
    GM1221193Courtesy of GENERAL MOTORS CORP.
  3. Carefully install the catalytic converter to the exhaust manifold.
  4. Install the catalytic converter to exhaust manifold fasteners.
  5. Connect the oxygen sensor electrical connector.
    6. Fig 2: Exhaust Pipes & Fasteners
    GM1224063Courtesy of GENERAL MOTORS CORP.
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.