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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1494 (Engine Exhaust System) >> Repair Instructions >> Catalytic Converter Replacement (4.3L, 4.8L, and 5.3L 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. If equipped, unclip the oxygen sensor connection from the floor reinforcement.
  3. Disconnect the oxygen sensor electrical connector.
    Fig 1: Disconnecting Oxygen Sensor Electrical Connector At Floor Reinforcement (4.3L, 4.8L & 5.3L)
    G02133577Courtesy of GENERAL MOTORS CORP.
  4. Remove the oxygen sensor clips from the frame.
  5. Disconnect the connector position assurance (CPA) retainers.
  6. Disconnect the oxygen sensor electrical connectors.
    Fig 2: Removing Clips, CPA Retainers & Oxygen Sensor Electrical Connectors At Frame (4.3L, 4.8L & 5.3L)
    G02133578Courtesy of GENERAL MOTORS CORP.
  7. Unclip the oxygen sensors electrical connectors from the following:
    • Hose clip
    • Transmission crossmember
  8. Disconnect the CPA retainers.
  9. Disconnect the oxygen sensor electrical connectors (1, 2).
    Fig 3: Disconnecting CPA Retainers & Oxygen Sensor Electrical Connectors At Hose Clip & Crossmember (4.3L, 4.8L & 5.3L)
    G02133579Courtesy of GENERAL MOTORS CORP.
  10. Remove the left exhaust manifold pipe nuts.
    Fig 4: Removing Left Exhaust Manifold Pipe Nuts (4.3L, 4.8L & 5.3L)
    G02133580Courtesy of GENERAL MOTORS CORP.
  11. Remove the right exhaust manifold pipe nuts.
    Fig 5: Removing Right Exhaust Manifold Pipe Nuts (4.3L, 4.8L & 5.3L)
    G02133581Courtesy of GENERAL MOTORS CORP.
  12. Remove the exhaust muffler nuts.
  13. Remove the catalytic converter.
    Fig 6: Removing Exhaust Muffler Nuts & Catalytic Converter (4.3L, 4.8L & 5.3L)
    G02133582Courtesy of GENERAL MOTORS CORP.
  14. If necessary, remove the oxygen sensors.
    Fig 7: Removing Oxygen Sensors (4.3L, 4.8L & 5.3L)
    G02133583Courtesy of GENERAL MOTORS CORP.
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