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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1783 (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 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: In order to avoid being burned, do not service the exhaust system while it is still hot. Service the system when it is cool.
CAUTION: Refer to PROTECTIVE GOGGLES & GLOVE CAUTION in Cautions and Notices.
  1. Raise and suitably support the vehicle. Refer to LIFTING 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.
  4. Raise the transmission off of the transmission support.
    Fig 1: Removing Transmission Mount To Transmission Support Nuts (6.0L & 8.1L)
    G02133591Courtesy 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) .
    Fig 2: Removing Transmission Support Crossmember & Bolts (6.0L & 8.1L)
    G02133592Courtesy of GENERAL MOTORS CORP.
  8. Disconnect the connector position assurance (CPA) retainers.
  9. Disconnect the oxygen sensor electrical connectors (1, 2).
    Fig 3: Disconnecting Oxygen Sensor Electrical Connectors (6.0L & 8.1L)
    G02133593Courtesy 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.
    Fig 4: Removing Left Exhaust Manifold Pipe Nuts (6.0L & 8.1L)
    G02133594Courtesy of GENERAL MOTORS CORP.
  13. Remove the catalytic converter.
  14. Slide the catalytic converter hanger out of the exhaust pipe hanger bracket.
    Fig 5: Removing Catalytic Converter (6.0L & 8.1L)
    G02133595Courtesy 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: Removing Catalytic Converter (6.0L w/RPO Y91)
    G02133596Courtesy of GENERAL MOTORS CORP.
  17. Remove the oxygen sensors if the catalytic converter is to be replaced.
    Fig 7: Removing Oxygen Sensors (6.0L & 8.1L)
    G02133597Courtesy of GENERAL MOTORS CORP.
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