Exhaust System: Service Precautions

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 TWC. The TWC heats to a high temperature after only a short period of engine operation. Failure to follow these instructions may result in personal injury.

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. Failure to follow these instructions may result in personal injury.

Caution:
^ Do not use leaded fuel in a vehicle equipped with a TWC.

Caution:
^ In a vehicle that is continually misfueled, the 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.

Caution:
^ 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.

Caution:
^ Extremely high temperatures of 1,100°C (2,012°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.