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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 (6.0L and 8.1L Engines) >> Removal Procedure

Removal 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.
  1. Raise and suitably support the vehicle. Refer toLifting and Jacking the Vehicle in General Information.
  2. Support the transmission with a suitable transmission jack.
  3. Remove the transmission mount to transmission support nuts.
    Fig 1: Identifying Transmission Mount Nuts
    GM647997Courtesy of GENERAL MOTORS CORP.
  4. Raise the transmission off of the transmission support.
    5. Fig 2: Transmission Support Crossmember (6.0L, 6.6L, and 8.1L Engines)
    GM788013Courtesy of GENERAL MOTORS CORP.
  5. Remove the transmission support crossmember bolts.
  6. Remove the transmission support crossmember.
  7. Remove the muffler. Refer to Muffler Replacement (4.3L, 4.8L, and 5.3L Engines)  or Muffler Replacement (6.0L, 6.6L, and 8.1L Engines) .
    8. Fig 3: View Of Transmission & HO2S Sensor Electrical Connector
    GM665040Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the connector position assurance (CPA) retainers.
  9. Disconnect the oxygen sensor electrical connectors (1, 2).
    10. Fig 4: Left Exhaust Manifold Pipe Nuts (6.0L or 8.1L Engine)
    GM858568Courtesy of GENERAL MOTORS CORP.
  10. Loosen the right exhaust manifold pipe nuts.
  11. Remove the left exhaust manifold pipe nuts.
  12. Using the transmission jack, lower the transmission slightly.
  13. Remove the catalytic converter.
  14. Slide the catalytic converter hanger out of the exhaust pipe hanger bracket.
    Fig 5: Exhaust Pipe Hanger Bracket (6.0L and 8.1L Engines)
    GM858580Courtesy of GENERAL MOTORS CORP.
  15. If equipped with a 6.0L engine, with regular production option (RPO) Y91, remove the catalytic converter.
  16. Slide the catalytic converter hanger out of the exhaust pipe hanger bracket.
    Fig 6: Exhaust Pipe Hanger Bracket (6.0L engine, With RPO Y91)
    GM858597Courtesy of GENERAL MOTORS CORP.
    17. Fig 7: View Of Oxygen Sensors
    GM664954Courtesy of GENERAL MOTORS CORP.
  17. Remove the oxygen sensors if the catalytic converter is to be replaced.
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