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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1126 (Engine Exhaust System) >> Repair Instructions >> Exhaust Manifold Replacement - Right (LA1) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure (LA1) or Battery Negative Cable Disconnect/Connect Procedure (LY7) in Engine Electrical.
  2. Remove the throttle body air inlet duct. Refer to Air Cleaner Intake Duct Replacement in Engine Controls - 3.4L.
  3. Remove the accelerator cable bracket from the throttle body. Refer to Accelerator Controls Cable Replacement in Engine Controls - 3.4L.
  4. Remove the manifold air pressure (MAP) sensor. Refer to Manifold Absolute Pressure (MAP) Sensor Replacement in Engine Controls - 3.4L.
  5. Remove the exhaust gas recirculation (EGR) valve. Refer to Exhaust Gas Recirculation (EGR) Valve Replacement in Engine Controls - 3.4L.
  6. Rotate the engine for service access. Refer to Rotating the Engine for Service Access .
  7. Remove the ignition module and the ignition coils with the bracket.
  8. Remove the spark plug wires from the engine right bank spark plugs.
  9. Disconnect the oxygen sensor electrical connector.
  10. Remove the evaporative emissions (EVAP) solenoid bracket.
  11. Remove the exhaust crossover pipe. Refer to Exhaust Crossover Pipe Replacement (LA1)  or Exhaust Crossover Pipe Replacement (LY7) .
  12. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  13. Remove the catalytic converter. Refer to Catalytic Converter Replacement .
    14. Fig 1: View Of Right Exhaust Manifold Heat Shields & Bolts
    GM187050Courtesy of GENERAL MOTORS CORP.
  14. Remove the exhaust manifold heat shield bolts.
  15. Remove the exhaust manifold heat shields.
    16. Fig 2: Right Exhaust Manifold (3.4L)
    GM187052Courtesy of GENERAL MOTORS CORP.
  16. Remove the exhaust manifold nuts.
  17. Remove the exhaust manifold.
  18. Remove the exhaust manifold gasket.
  19. Lower the vehicle.
  20. Clean the engine right side exhaust manifold sealing surfaces and the cylinder head sealing surfaces. Refer to Exhaust Manifold Cleaning and Inspection in Engine Mechanical 3.4L Unit Repair.
  21. If you are REPLACING the engine right side exhaust manifold, remove the exhaust gas recirculation (EGR) valve pipe.
  22. If you are REPLACING the engine right side exhaust manifold, remove the Heated Oxygen Sensor (HO2S). Refer to Heated Oxygen Sensor Replacement - Position 1 in Engine Controls - 3.4L.
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