GM Service Manual Online
For 1990-2009 cars only
  1. The exhaust system hangers minimize noise transfer. Vibration and noise can be transmitted into the vehicle under the following conditions:
  2. • System contact with the body
    • A restricted hanger

    Object Number: 284269  Size: SH
  3. Position the clamps and the insulator so that the hanger is vertical when the exhaust system is at operating temperature or 10 mm (3/8 in) forward at room temperature.
  4. Inspect that the brackets are horizontal.
  5. Use heat in front of the rear suspension, in order to reposition the pipes if necessary.
  6. Allow pipes to cool before touching them.
  7. Do not use an acetylene torch near the fuel tank.
  8. Inspect that the support brackets are horizontal.
  9. Inspect that the clearance between the frame members and the floor pan is a minimum of 35 mm (1.5 in) after the following procedures:
  10. • Hanger adjustment
    • Pipe positioning
  11. Tighten all clamps according to the specified torques. Refer to Fastener Tightening Specifications .
  12. Clearance is needed in order to avoid the following conditions:
  13. • Overheating of the floor pan
    • Damage to the passenger compartment carpet
  14. Inspect that the weight of the system is evenly distributed according to the equal deflection at each hanger on the following components:
  15. • The brackets
    • The hangers
  16. Some vehicles may exhibit exhaust system misalignment due to an improper installation process of the front pipe. The front pipe, which when installed low in the assembly, can pull the exhaust system forward and hit part of the body, or close enough such that when the vehicle goes over a bump it will contact the body. In order to properly correct the condition, reinstall the rear pipe. Refer to Exhaust System Description . The exhaust system should move into proper alignment.
  17. Ensure that the exhaust system has the proper clearances.