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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 >> Exhaust Seal Replacement >> 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 to Lifting and Jacking the Vehicle in General Information.
  2. If equipped with a 4.3L, 4.8L, or 5.3L engine, perform the following:
    1. Remove the clip from around the engine harness and the oxygen sensor pigtail.
    2. Disconnect the connector position assurance (CPA) retainer.
    3. Disconnect the forward oxygen sensor electrical connector.
    Fig 1: View Of O2 Sensor Harness Routing And Harness Mounting Brackets
    GM664828Courtesy of GENERAL MOTORS CORP.
  3. If equipped with a 4.3L, 4.8L, or 5.3L engine, perform the following:
    1. Unclip the oxygen sensor electrical connector from the hose clip.
    2. Disconnect the CPA retainer.
    3. Disconnect the oxygen sensor electrical connector (1).
  4. If equipped with a 6.0L or 8.1L engine, perform the following:
    1. Disconnect the CPA retainer.
    2. Disconnect the oxygen sensor electrical connector (1).
    Fig 2: View Of O2 Sensor Harness Routing
    GM664951Courtesy of GENERAL MOTORS CORP.
    Fig 3: View Of Transmission & HO2S Sensor Electrical Connector
    GM665040Courtesy of GENERAL MOTORS CORP.
  5. Support the catalytic converter or exhaust manifold pipe with adjustable jackstands.
    6. Fig 4: View Of Left Exhaust Manifold Pipe & Nuts
    GM858550Courtesy of GENERAL MOTORS CORP.
  6. If equipped with a 4.3L, 4.8L, or 5.3L engine, remove the left exhaust manifold pipe nuts.
    7. Fig 5: View Of Right Exhaust Pipe Nuts
    GM858553Courtesy of GENERAL MOTORS CORP.
  7. If equipped with a 4.3L, 4.8L, or 5.3L engine, remove the right exhaust manifold pipe nuts.
    8. Fig 6: Exhaust Manifold Pipe Nuts (6.0L, 6.6L, and 8.1L Engines)
    GM858574Courtesy of GENERAL MOTORS CORP.
  8. If equipped with a 6.0L or 8.1L engine, remove the right exhaust manifold pipe nuts.
    9. Fig 7: Left Exhaust Manifold Pipe Nuts (6.0L or 8.1L Engine)
    GM858568Courtesy of GENERAL MOTORS CORP.
  9. If equipped with a 6.0L or 8.1L engine, perform the following:
    1. Remove the left exhaust manifold pipe nuts.
    2. Remove the exhaust hanger mounting bracket bolts.
  10. Lower the catalytic converter or exhaust manifold pipe using the adjustable jackstands.
  11. Remove the exhaust manifold pipe seal(s).
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