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Home >> Cadillac >> 2011 >> DTS 4.6 S >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust System >> Repair Instructions >> Exhaust System Replacement >> Installation Procedure
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Installation Procedure

CAUTION:

Refer to Exhaust System Inspection Caution .

    Fig 1: View Of Rear Exhaust Hanger To Hanger Bracket Nuts
    GM1670485Courtesy of GENERAL MOTORS COMPANY
  1. With the aid of an assistant, raise the exhaust system.
  2. Install the rear exhaust hanger to hanger bracket studs.
    3. CAUTION:

    Refer to Fastener Caution .

  3. Install the rear exhaust hanger to hanger bracket nuts.

    Tighten 

    Tighten the nuts to 30 N.m (22 lb ft).

    4. Fig 2: View Of Catalytic Converter, Gasket & Studs
    GM1670482Courtesy of GENERAL MOTORS COMPANY
  4. Install a NEW catalytic converter gasket onto the studs.
  5. Install the catalytic converter to the rear exhaust manifold pipe.
  6. Install and snug the catalytic converter to the rear exhaust manifold pipe nuts.
    7. Fig 3: View Of Rear Exhaust Hanger Bracket To Rear Compartment Side Rail Bolts
    GM1670480Courtesy of GENERAL MOTORS COMPANY
  7. Install the rear exhaust hanger bracket to the rear compartment side rail bolts.

    Tighten 

    Tighten the bolts 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.

    Tighten 

    Tighten the bolts to 30 N.m (22 lb ft).

  9. Tighten the catalytic converter to the rear exhaust manifold pipe nuts previously installed.

    Tighten 

    Tighten the nuts 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-seize compound, GM P/N 12377953 or equivalent.
  11. Install the HO2S.

    Tighten 

    Tighten the sensor 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 .
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