EGR stands for Exhaust Gas Recirculation, this valve is found in Ford Focus and it modifies the flow of exhaust back to the combustion chamber, thus diluting the air-fuel mixture in order to minimize on air pollutants once the ratio is slightly off. This technique is effective in decreasing the level of nitrogen oxide emission by using the re-circulation of the exhaust gas for cooling the combustion chamber temperature and -thereby- reducing the formation of NOx. EGR Valves in Ford Focus first started as simple orifice jets, whereas the current models contain variable EGR valves that are apt to engine conditions; some models even lack an EGR valve. These valves are vital in regulating the amount of emissions and the efficiency of the engine, though may call for cleaning or replacement due to a build up of carbon.
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