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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 >> Exhaust Seal Replacement >> 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.
  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: Removing Engine Harness Clip, CPA Retainer & Forward Oxygen Sensor Electrical Connector (4.3L, 4.8L & 5.3L)
    G02133563Courtesy 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).
    Fig 2: Disconnecting CPA Retainer & Oxygen Sensor Electrical Connector (4.3L, 4.8L & 5.3L)
    G02133564Courtesy of GENERAL MOTORS CORP.
  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).
  5. Support the catalytic converter or exhaust manifold pipe with adjustable jackstands.
    Fig 3: Disconnecting CPA Retainer & Oxygen Sensor Electrical Connector (6.0L & 8.1L)
    G02133565Courtesy of GENERAL MOTORS CORP.
  6. If equipped with a 4.3L, 4.8L, or 5.3L engine, remove the left exhaust manifold pipe nuts.
    Fig 4: Removing Left Exhaust Manifold Pipe Nuts (4.3L, 4.8L & 5.3L)
    G02133566Courtesy of GENERAL MOTORS CORP.
  7. If equipped with a 4.3L, 4.8L, or 5.3L engine, remove the right exhaust manifold pipe nuts.
    Fig 5: Removing Right Exhaust Manifold Pipe Nuts (4.3L, 4.8L & 5.3L)
    G02133567Courtesy of GENERAL MOTORS CORP.
  8. If equipped with a 6.0L or 8.1L engine, remove the right exhaust manifold pipe nuts.
    Fig 6: Removing Right Exhaust Manifold Pipe Nuts (6.0L & 8.1L)
    G02133568Courtesy of GENERAL MOTORS CORP.
  9. If equipped with a 6.0L or 8.1L engine, perform the following:
    • Remove the left exhaust manifold pipe nuts.
    • 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).
    Fig 7: Removing Left Exhaust Manifold Pipe, Nuts & Seals (6.0L & 8.1L)
    G02133569Courtesy of GENERAL MOTORS CORP.
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