One potential contaminant is leaded gas, which can destroy the catalysts, although it is rarely found in the U.S. Others contaminants include engine coolant, which can leak into the combustion system because of a faulty cylinder head gasket, and engine oil. Those fluids can clog a catalytic converter so that exhaust gases are restricted from passing through. Car engines are like athletes in that they require lots of oxygen. If the exhaust flow is restricted, it means less air can get into the engine and performance suffers. If the engine responds sluggishly or quits after running for a while, a clogged converter could be to blame.
Catalytic converters can overheat because of excessive amounts of unburned gas caused by a misfiring spark plug or a leaky exhaust valve. In addition, a failed oxygen sensor can cause overheating.
On many vehicles, the "cat" is located under the vehicle, and like other parts of the exhaust system, it can also be damaged by road debris or by running over a curb.
Catalytic Converter TheftThose precious metals we talked about can draw attention: Catalytic converters are frequently stolen because of the precious metals inside. Converters have small amounts of platinum, rhodium and palladium, all of which have value for metal dealers.
Catalytic Converter Maintenance Among the symptoms of a bad catalytic converter are:
- Sluggish engine performance
- Reduced acceleration
- Dark exhaust smoke
- The smell of sulfur or rotten eggs from the exhaust
- Excessive heat under the vehicle
Following your vehicle's recommended maintenance schedule can help delay this moment as long as possible — often 10 years or more. Keeping your exhaust, emissions and combustion systems in good shape will minimize the risk of your catalytic converter failing before its time.
Finally, don't ignore the check-engine light. Waiting to change that filter could lead prematurely to a $600.00 catalytic converter replacement.