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Exhaust Gas Recirculation (EGR) is being used widely to reduce and control the oxides of nitrogen (NOx) emission from diesel engines. EGR controls the NOx because it lowers oxygen concentration and flame temperature of the working fluid in the combustion chamber.
Photo 2/5 | 1105dp The Evil Of Egr On Diesel Engines installed Map Sensor. But if your MAP sensor is your buddy, your exhaust gas recirculation (EGR) valve is the bully with the huge forehead who stole your lunch money and pantsâd you in front of the cheerleaders. In a gasser, EGR isnât too obnoxious because gas engines donât create much soot.