Catalytic Converter

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The catalytic converter further reduces the carbon monoxide and hydrocarbons content of the exhaust gases. In the catalytic converter the exhaust gases are passed through honeycombed ceramic elements coated with a special surface treatment called a 'washcoat'.

The washcoat increases the surface area of the ceramic elements by a factor of approximately 7000. On top of the washcoat is a coating containing palladium and rhodium, which is the active constituent for converting harmful emissions into inert by-products. These add oxygen to the carbon monoxide and the hydrocarbons in the exhaust gases, to convert them into carbon dioxide and water respectively.

A mid catalyst HO2S is located on each catalytic converter and a post catalyst HO2S on each of the outlet pipes.

Each HO2S is used to monitor the exhaust gases leaving the engine. The PCM uses this information to provide accurately metered quantities of fuel to the combustion chambers. This makes sure the most efficient use of fuel and to minimize the exhaust emissions.

For additional information, refer to: ELECTRONIC ENGINE CONTROLS - V8 S/C 5.0L PETROL (G2255267)