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Home >> GMC >> 2002 >> Jimmy 2D Utility, Part Time, Standard >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust System >> Repair Instructions >> Catalytic Converter Replacement (Utility 4.3L) >> Installation Procedure

Installation Procedure

  1. Install the heated oxygen sensors (HO2S) as necessary.
  2. Install the catalytic converter and NEW gaskets to the vehicle.
  3. Install the catalytic converter to the catalytic converter rubber hangers.
    Fig 1: Catalytic Converter From Rubber Catalytic Converter Hangers
    G01660198Courtesy of GENERAL MOTORS CORP.
    NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  4. Install the catalytic converter to exhaust manifold flange nuts.
    Fig 2: Catalytic Converter To Exhaust Manifold Flange Nuts
    G01660199Courtesy of GENERAL MOTORS CORP.

    Tighten 

    Tighten the catalytic converter to exhaust manifold nuts to 53 N.m (39 lb ft).

  5. Install the muffler and NEW gasket to the catalytic converter.
  6. Install the muffler to the catalytic converter flange nuts.
    Fig 3: Muffler To Catalytic Converter Flange Nuts
    G01660200Courtesy of GENERAL MOTORS CORP.

    Tighten 

    Tighten the muffler to the catalytic converter flange nuts to 40 N.m (30 lb ft).

  7. Connect the post-converter heated oxygen sensor (HO2S) electrical connection.
    8. Fig 4: Post-Converter Heated Oxygen Sensor (HO2S) Electrical Connection
    G01660201Courtesy of GENERAL MOTORS CORP.
  8. Connect the RH pre-converter heated oxygen sensor (HO2S) electrical connection.
    9. Fig 5: RH Pre-Converter Heated Oxygen Sensor (HO2S) Electrical Connection
    G01660202Courtesy of GENERAL MOTORS CORP.
  9. Connect the LH pre-converter heated oxygen sensor (HO2S) electrical connection.
    10. Fig 6: LH Pre-Converter Heated Oxygen Sensor (HO2S) Electrical Connection
    G01660203Courtesy of GENERAL MOTORS CORP.
  10. Install the transmission support. Refer to TRANSMISSION SUPPORT .
  11. Lower the vehicle.
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