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Home >> Buick >> 2011 >> Lucerne CX >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust System >> Repair Instructions >> Exhaust System Replacement >> Installation Procedure
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Installation Procedure

    Fig 1: Identifying Rear Exhaust System Hanger Bracket Nuts
    GM1688768Courtesy of GENERAL MOTORS COMPANY
  1. Install the rear exhaust hanger brackets.
    2. CAUTION:

    Refer to Fastener Caution .

  2. Install the rear exhaust hanger to hanger bracket nuts and tighten to 30 N.m (22 lb ft).
    3. Fig 2: View Of Catalytic Converter, Gasket & Studs
    GM1670482Courtesy of GENERAL MOTORS COMPANY
  3. Install a NEW muffler to exhaust manifold pipe gasket onto the studs.
  4. With the aid of an assistant, raise the exhaust system.
  5. Install the muffler to rear exhaust manifold pipe.
  6. Install and snug the muffler to rear exhaust manifold pipe nuts.
    7. Fig 3: Identifying Exhaust System Mounting Points
    GM1688299Courtesy of GENERAL MOTORS COMPANY
  7. Install the rear exhaust hanger bracket to the rear compartment side rail bolts (1) and tighten to 50 N.m (37 lb ft).
    8. Fig 4: View Of Exhaust Hanger To Rear Suspension Support Bracket Bolt
    GM1670483Courtesy of GENERAL MOTORS COMPANY
  8. Install the exhaust hanger to the rear suspension support bracket bolts and tighten to 30 N.m (22 lb ft).
  9. Tighten the muffler to rear exhaust manifold pipe nuts previously installed to 25 N.m (18 lb ft).
    10. Fig 5: Identifying HO2S
    GM1670531Courtesy of GENERAL MOTORS COMPANY
  10. If reusing the old HO2S, coat the threads with anti-sieze compound, GM P/N 12377953 or equivalent.
  11. Install the HO2S and tighten to 41 N.m (30 lb ft).
    12. Fig 6: Identifying Oxygen Sensor Wiring Harness Heat Shield
    GM1665113Courtesy of GENERAL MOTORS COMPANY
  12. Connect the HO2S electrical connector.
  13. Install the CPA retainer.
  14. Install the oxygen sensor wiring harness heat shield. Refer to Oxygen Sensor Wiring Harness Heat Shield Replacement .
    15. Fig 7: Identifying Oxygen Sensor Wiring Harness Heat Shield
    GM1665113Courtesy of GENERAL MOTORS COMPANY
  15. Connect the HO2S electrical connector.
  16. Install the CPA retainer.
  17. Install the oxygen sensor wiring harness heat shield. Refer to Oxygen Sensor Wiring Harness Heat Shield Replacement .
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