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Home >> Hummer >> 2007 >> H3 Automatic >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust >> Repair Instructions >> Catalytic Converter Replacement >> Removal Procedure

Removal Procedure

CAUTION: Refer to Exhaust Service Caution .
CAUTION: Refer to Protective Goggles and Glove Caution .
    Fig 1: View Of HO2S Electrical Connector
    GM1363915Courtesy of GENERAL MOTORS CORP.
  1. Remove the right torsion bar. Refer to Torsion Bar Replacement .
  2. Disconnect the heated oxygen sensor (HO2S) at the sensor pigtail (3).
  3. Remove the HO2S if replacement is necessary. Refer to Heated Oxygen Sensor 2 Replacement .
    4. Fig 2: View Of Exhaust Hanger And Exhaust Muffler Hanger Rod
    GM1560120Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not use oil base lubricants.
  4. Apply a soapy solution to the exhaust muffler hanger rod (3) in order to ease the removal of the exhaust hanger (2), if necessary.
  5. Pry the exhaust hanger (2) free from the exhaust muffler hanger rod (3), if necessary.
    6. Fig 3: View Of Nuts Securing Muffler To Catalytic Converter
    GM1560112Courtesy of GENERAL MOTORS CORP.
  6. Remove the nuts securing the muffler to the catalytic converter.
  7. Position the muffler rearward enough to allow the studs located in the muffler to clear the catalytic converter pipe flange.
    8. Fig 4: View Of Catalytic Converter
    GM1313621Courtesy of GENERAL MOTORS CORP.
  8. Remove the nuts attaching the catalytic converter to the exhaust manifold.
  9. Remove the catalytic converter.
    10. Fig 5: View Of Exhaust Manifold Seal
    GM1313620Courtesy of GENERAL MOTORS CORP.
  10. Remove and discard the exhaust manifold seal at the exhaust manifold flange.
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