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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 Manifold Replacement - Right (4.3L Engine) >> 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. Remove the right exhaust manifold pipe nuts.
  3. Lower the vehicle.
    Fig 1: Removing Exhaust Manifold Pipe Nuts - Right (4.3L)
    G02133470Courtesy of GENERAL MOTORS CORP.
  4. Loosen the air cleaner outlet duct clamp at the mass airflow/intake air temperature (MAF/IAT) sensor.
    Fig 2: Loosening Air Cleaner Outlet Duct Clamp At MAF/IAT Sensor (4.3L)
    G02133471Courtesy of GENERAL MOTORS CORP.
  5. Remove the positive crankcase ventilation (PCV) hose.
    Fig 3: Removing Positive Crankcase Ventilation Hose (4.3L)
    G02133472Courtesy of GENERAL MOTORS CORP.
  6. Remove the air cleaner adapter nut.
    Fig 4: Removing Air Cleaner Adapter Nut (4.3L)
    G02133473Courtesy of GENERAL MOTORS CORP.
  7. In order to remove the air cleaner outlet duct, pivot the duct upward until the hinge clip releases from the lip on the throttle body.
  8. Remove the oil level indicator tube. Refer to OIL LEVEL INDICATOR AND TUBE REPLACEMENT in Engine Mechanical - 4.3L.
    Fig 5: Removing Air Cleaner Outlet Duct (4.3L)
    G02133474Courtesy of GENERAL MOTORS CORP.
  9. Disconnect the spark plug wires from the spark plugs.
  10. Remove the spark plug wire retainer bolt.
  11. Reposition the wire retainer to the top of the engine.
  12. Remove the spark plugs.
    Fig 6: Removing Spark Plugs - Right (4.3L)
    G02133475Courtesy of GENERAL MOTORS CORP.
  13. Remove the exhaust manifold and spark plug heat shield bolts.
  14. Remove the exhaust manifold and spark plug heat shields.
    Fig 7: Removing Exhaust Manifold & Spark Plug Heat Shields - Right (4.3L)
    G02133476Courtesy of GENERAL MOTORS CORP.
  15. Remove and discard the exhaust manifold gaskets.
    Fig 8: Removing Exhaust Manifold Gaskets - Right (4.3L)
    G02133477Courtesy of GENERAL MOTORS CORP.
  16. Remove the exhaust manifold heat shield, if required.
  17. Clean all gasket mating surfaces.
    Fig 9: Removing Exhaust Manifold Heat Shield - Right (4.3L)
    G02133478Courtesy of GENERAL MOTORS CORP.
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