Exhaust System: Service Precautions

WARNING: The normal operating temperature of the exhaust system is very high. Never work around or attempt to repair any part of the exhaust system until it has cooled, Use special care when working around the three-way catalytic converter. The three-way catalytic converter heats to a high temperature after only a short period of engine operation.

WARNING: Exhaust gases contain carbon monoxide which can be harmful to health and are potentially lethal. Exhaust system leaks should be repaired immediately. Never operate the engine in enclosed areas.

In a vehicle that is continually misfueled, lead in the fuel will be deposited in the TWC and completely blanket the catalyst. Lead reacts with platinum to "poison" the catalyst. Continuous use of leaded fuel can destroy the catalyst and render the TWC useless. The addition of lead to the TWC can also solidify the catalyst, causing excessive back pressure in the exhaust system and possibly causing engine damage.

Extremely high temperatures of 1100°C (2012°F) or above due to misfiring or an over-rich fuel/air mixture will cause the ceramic base to sinter or burn, destroying the TWC.

The TWC is designed to provide a long service life. No maintenance is necessary for the TWC. Avoid the following conditions:
- driving with a misfiring engine.
- continuously running the engine with a misfiring spark plug.
- parking or stopping the vehicle over combustible material such as dry grass. The material can be ignited by the high temperatures of the TWC and muffler.