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Home >> Cadillac >> 2005 >> CTS Base, 2.8 T, Standard >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust System >> Repair Instructions >> Exhaust System Replacement (LY7) >> Installation Procedure

Installation Procedure

    Fig 1: View Of Muffler & Rear Hangers
    GM786659Courtesy of GENERAL MOTORS CORP.
  1. Install the HO2S to the exhaust system. Refer to Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2 and Heated Oxygen Sensor (HO2S) Replacement Bank 2 Sensor 2 in Engine Controls, 3.6L (LY7)
  2. Install the muffler rear hangers (2) to the muffler(s).
    3. Fig 2: View Of Exhaust System
    GM1215598Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Exhaust System Inspection Notice in Cautions and Notices.
    NOTE: Refer to Flex Decoupler Notice in Cautions and Notices.
  3. With the aid of an assistant, raise the exhaust system into position.
  4. Install the exhaust system (muffler) nuts.
    5. Fig 3: View Of Mufflers & Hanger Rods
    GM1559376Courtesy of GENERAL MOTORS CORP.
  5. Install the mufflers to the muffler rear hangers.
    6. Fig 4: View Of Right Muffler Hanger & Frame Hanger Rod
    GM1559375Courtesy of GENERAL MOTORS CORP.
  6. Install the right muffler front hanger to the frame hanger rod.
    7. Fig 5: View Of Muffler Front Hanger & Frame Hanger Rod
    GM1559373Courtesy of GENERAL MOTORS CORP.
  7. Install the left muffler front hanger to the frame hanger rod.
    8. Fig 6: Identifying Muffler Pipes At Left And Right Side Catalytic Converters
    GM1224063Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  8. Install the exhaust pipe nuts.

    Tighten:  Tighten the nuts to 22 N.m (16 lb ft).

    9. Fig 7: Identifying Floor Panel Tunnel Brace
    GM772383Courtesy of GENERAL MOTORS CORP.
  9. Install the floor panel tunnel brace to the floor panel.
  10. Install the floor panel tunnel brace bolts.

    Tighten:  Tighten the floor panel tunnel brace bolts to 25 N.m (18 lb ft).

    11. Fig 8: View Of HO2S Electrical Connector, Sensor 2 (Bank 1 Shown, Bank 2 Similar)
    GM1201222Courtesy of GENERAL MOTORS CORP.
  11. Connect the left and right bank 2 HO2S electrical connectors (bank 1 shown, bank 2 similar).
  12. Install the HO2S wiring harnesses to the transmission case.
  13. Lower the vehicle.
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