Exhaust System Inspection for Buick Century (China) (CNG) 1999
Inspect the exhaust resonator pipe and the exhaust muffler with exhaust pipe and tail pipe for the following conditions:
| • | Cracked joints |
| • | Broken welds |
| • | Corrosion damage (Corrosion damage could cause leaks in the exhaust system.) |
Inspect any clamps, the brackets, and the insulators for the following conditions:
| • | Broken bolts |
| • | Stripped bolt threads |
| • | Corroded bolts |
The exhaust system (including the heat shield) must be free of the following conditions:
| • | Leaks |
| • | Binding |
| • | Grounding |
| • | Excessive vibration |
These conditions may occur if any of the following components are loose or damaged:
| • | Flange bolts or flange nuts |
| • | Heat shields |
| • | Brackets |
| • | Pipes |
If any of these conditions exist, inspect the exhaust system alignment. Align and replace any components necessary, including new manifold seals, nuts, and gaskets.
