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Home >> Cadillac >> 2007 >> STS V >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust System >> Repair Instructions >> Exhaust System Replacement >> Removal Procedure

Removal Procedure

CAUTION: Refer to Exhaust Service Caution in Cautions and Notices.
CAUTION: Refer to Protective Goggles and Glove Caution in Cautions and Notices.
    Fig 1: Identifying Floor Panel Tunnel Brace
    GM772383Courtesy of GENERAL MOTORS CORP.
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the heated oxygen sensors from the exhaust pipes. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 and Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 in Engine Controls - 4.6L.
  3. Remove the 2 bolts securing the floor panel tunnel brace to the floor panel.
  4. Remove the floor panel tunnel brace from the floor panel.
    5. Fig 2: View Of Exhaust Pipe-To-Exhaust Manifold Nuts
    GM772367Courtesy of GENERAL MOTORS CORP.
  5. Suitably support the exhaust system.
  6. Remove the nuts securing the exhaust pipes to the exhaust manifolds.
    7. Fig 3: Locating Front Exhaust Hangers
    GM772376Courtesy of GENERAL MOTORS CORP.
  7. Pry the front exhaust hangers (1) free from the rear suspension hanger rods.
    8. Fig 4: Locating Tail Pipe Hangers
    GM772379Courtesy of GENERAL MOTORS CORP.
  8. Apply a suitable lubricant to the tail pipe hanger rods in order to ease the removal of the tail pipe hangers (1).
  9. Pry the tail pipe hangers (1) free from the tail pipe hanger rods.
    10. Fig 5: View Of Exhaust System
    GM1215598Courtesy of GENERAL MOTORS CORP.
  10. With the aid of an assistant, lower the exhaust system.
  11. Remove the exhaust manifold seals. Do not reuse the seals.
    12. Fig 6: View Of Exhaust System Components
    GM786659Courtesy of GENERAL MOTORS CORP.
  12. While the exhaust system is on the floor complete the following:
    1. Apply a suitable lubricant to the exhaust pipe hanger rods (3) in order to ease the removal of the front exhaust hangers (2).
    2. Pull the front exhaust hangers (2) from the exhaust pipe hanger rods.
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