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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1468 (Engine Exhaust System) >> Repair Instructions >> Catalytic Converter Replacement (5.3L Engine) >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
    2. Fig 1: Removing/Installing HO2S From Catalytic Converter
    GM899721Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Cautions and Notices.
    NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Cautions and Notices.
  2. Unscrew both front heated oxygen sensor (HO2S) sensors (1) from the catalytic converter.
  3. Unscrew both rear HO2S sensors (2) from the catalytic converter.
  4. Remove the rear propeller shaft. Refer to Propeller Shaft Replacement - Rear in Propeller Shaft.
  5. If equipped with four wheel drive (4WD), Remove the front propeller shaft. Refer to Propeller Shaft Replacement - Front in Propeller Shaft.
  6. Support the transmission with a transmission jack.
  7. Remove the transmission support. Refer to Transmission Support Replacement in Frame and Underbody.
    8. Fig 2: Exhaust Pipe To Muffler Joint
    GM753687Courtesy of GENERAL MOTORS CORP.
  8. Remove the exhaust muffler nuts.
    9. Fig 3: Locating Exhaust Hangers
    GM753688Courtesy of GENERAL MOTORS CORP.
  9. Separate the exhaust hanger insulators from the exhaust system and position the exhaust system rearward for additional clearance.
    10. Fig 4: View Of Left Catalytic Converter To The Exhaust Manifold Connection
    GM899634Courtesy of GENERAL MOTORS CORP.
  10. Remove the left exhaust manifold pipe nuts.
    11. Fig 5: View Of Right Catalytic Converter To The Exhaust Manifold Connection
    GM899636Courtesy of GENERAL MOTORS CORP.
  11. Remove the right exhaust manifold pipe nuts.
    12. Fig 6: Identifying Catalytic Converter Outlet Pipe
    GM899633Courtesy of GENERAL MOTORS CORP.
  12. Raise the transmission with the transmission jack for additional catalytic converter pipe clearance.
  13. Tilt the catalytic converter (1) in order to lower the left side catalytic converter pipe below the vehicle frame. Rotate the catalytic converter outlet pipe toward the left side of the vehicle to gain the necessary clearance for the right side catalytic converter pipe to clear the vehicle frame. Remove the catalytic converter (1) from the vehicle.
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