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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1390 (Engine Exhaust System) >> Repair Instructions >> Catalytic Converter Replacement (4.8L and 5.3L Engines) >> Installation Procedure

Installation Procedure

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    Fig 1: View Of Oxygen Sensors
    GM664954Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to FASTENER NOTICE .
  1. If the catalytic converter was replaced, perform the following:
    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 oxygen sensors to 42 N.m (31 lb ft).

  2. Install the catalytic convertor.
    3. Fig 2: View of Exhaust Manifold Pipe Seals
    GM664837Courtesy of GENERAL MOTORS CORP.
  3. Install NEW exhaust manifold pipe seals to the exhaust manifolds.
  4. Install the right exhaust manifold pipe nuts until sung.
    5. Fig 3: Identifying Left Exhaust Manifold Pipe Nuts
    GM664832Courtesy of GENERAL MOTORS CORP.
  5. Install the left exhaust manifold pipe nuts until snug.
  6. Tighten the right and left exhaust manifold pipe nuts.

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

    7. Fig 4: Identifying Exhaust Muffler Nuts
    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: View of Oxygen Sensor Connection
    GM665019Courtesy of GENERAL MOTORS CORP.
  14. Clip the oxygen sensor connection to the floor reinforcement.
    15. Fig 8: View of Oil Pan Skid Plate & Bolts
    GM339429Courtesy of GENERAL MOTORS CORP.
  15. Install the oil pan skid plate and bolts, if necessary.

    Tighten:  Tighten the bolts to 20 N.m (15 lb ft).

    16. Fig 9: View Of Engine Protection Shield
    GM349061Courtesy of GENERAL MOTORS CORP.
  16. Install the engine shield and bolts, if necessary.

    Tighten:  Tighten the bolts to 20 N.m (15 lb ft).

  17. Lower the vehicle.
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