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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1054 (Engine Exhaust System) >> Repair Instructions >> Catalytic Converter Replacement (4.3L, 4.8L, and 5.3L Engines) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to Fastener Notice in Cautions and Notices.
  1. If necessary, install the oxygen sensors.
    1. Apply anti-seize compound GM P/N 12377953 or equivalent to the threads of the old oxygen sensors.
    2. Install the oxygen sensors.

      Tighten:  Tighten the sensors to 42 N.m (31 lb ft).

    Fig 1: View Of Oxygen Sensors
    GM664954Courtesy of GENERAL MOTORS CORP.
  2. Install the catalytic convertor.
    3. Fig 2: View Of Right Exhaust Pipe Nuts
    GM858553Courtesy of GENERAL MOTORS CORP.
  3. Install NEW exhaust manifold pipe seals to the exhaust manifolds.
  4. Install the right exhaust manifold pipe nuts until snug.
    5. Fig 3: View Of Left Exhaust Manifold Pipe & Nuts
    GM858550Courtesy of GENERAL MOTORS CORP.
  5. Install the left exhaust manifold pipe nuts until snug.
  6. Tighten the exhaust manifold pipe nuts.

    Tighten:  Tighten the nuts to 50 N.m (39 lb ft).

    7. Fig 4: Exhaust Muffler Nuts (4.3L, 4.8L, and 5.3L Engines)
    GM664840Courtesy of GENERAL MOTORS CORP.
  7. Install the exhaust muffler nuts.

    Tighten:  Tighten the nuts to 40 N.m (30 lb ft).

    8. Fig 5: View Of O2 Sensor Harness Routing
    GM664951Courtesy of GENERAL MOTORS CORP.
  8. Connect the oxygen sensor electrical connectors (1, 2).
  9. Connect the CPA retainers.
  10. Clip the oxygen sensors electrical connectors to the following:
    • Hose clip
    • Transmission crossmember
    11. Fig 6: View Of O2 Sensor Harness Routing And Harness Mounting Brackets
    GM664828Courtesy of GENERAL MOTORS CORP.
  11. Connect the oxygen sensor electrical connectors.
  12. Connect the CPA retainers.
  13. Install the clip around the engine harness and the oxygen sensor pigtail.
    14. Fig 7: Oxygen Sensor Connection At Floor Reinforcement (4.3L, 4.8L, and 5.3L Engines)
    GM665019Courtesy of GENERAL MOTORS CORP.
  14. Connect the oxygen sensor electrical connector.
  15. If equipped, clip the oxygen sensor connection to the floor reinforcement.
  16. Lower the vehicle.
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