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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 231 (Engine Exhaust System) >> Repair Instructions >> Catalytic Converter Replacement (4.3L) >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise the vehicle.
  2. Disconnect the heated oxygen sensor (HO2S) electrical connections from catalytic converter pipe.
  3. Remove the exhaust hanger bolts and hanger from the transmission.
  4. Remove the nuts and the seals retaining the catalytic converter pipe to the exhaust manifolds.
    Fig 1: Disconnecting Heated Oxygen Sensor Electrical Connections
    G02080465Courtesy of GENERAL MOTORS CORP.
    WARNING: In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system when it is cool.
    WARNING: Always wear protective goggles and gloves when removing exhaust parts as falling rust and sharp edges from worn exhaust components could result in serious personal injury.
  5. Remove the flange nuts from the catalytic pipe to the muffler.
  6. Remove the catalytic converter from the vehicle.
  7. Remove the oxygen sensors as necessary. Refer to OXYGEN SENSOR .
    Fig 2: Removing Nuts Retaining Catalytic Pipe To Muffler
    G02080466Courtesy of GENERAL MOTORS CORP.
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