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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust System >> Repair Instructions >> Catalytic Converter Replacement (Utility 4.3L) >> Removal Procedure

Removal Procedure

  1. Raise and suitably support the vehicle. Refer to LIFTING & JACKING THE VEHICLE in General Information.
  2. Remove the transmission support. Refer to TRANSMISSION SUPPORT .
  3. Disconnect the LH pre-converter heated oxygen sensor (HO2S) electrical connection.
    4. Fig 1: LH Pre-Converter Heated Oxygen Sensor (HO2S) Electrical Connection
    G01660192Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the RH pre-converter heated oxygen sensor (HO2S) electrical connection.
    5. Fig 2: RH Pre-Converter Heated Oxygen Sensor (HO2S) Electrical Connection
    G01660193Courtesy of GENERAL MOTORS CORP.
  5. Disconnect the post-converter heated oxygen sensor (HO2S) electrical connection.
    6. Fig 3: Post-Converter Heated Oxygen Sensor (HO2S) Electrical Connection
    G01660194Courtesy of GENERAL MOTORS CORP.
  6. Remove the muffler to the catalytic converter flange nuts.
    7. Fig 4: Muffler To Catalytic Converter Flange Nuts
    G01660195Courtesy of GENERAL MOTORS CORP.
  7. Remove the muffler from the catalytic converter.
  8. Remove the catalytic converter to exhaust manifold flange nuts.
    9. Fig 5: Catalytic Converter To Exhaust Manifold Flange Nuts
    G01660196Courtesy of GENERAL MOTORS CORP.
  9. Remove the catalytic converter from the rubber catalytic converter hangers.
    10. Fig 6: Catalytic Converter From Rubber Catalytic Converter Hangers
    G01660197Courtesy of GENERAL MOTORS CORP.
  10. Remove the catalytic converter and gasket from the vehicle.
  11. Remove the heated oxygen sensors (HO2S) as necessary.
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