The Exhaust Gas Recirculation (EGR) system mixes exhaust gases into the air passing through the intake. Diluting the air/fuel mixture lowers combustion temperatures, reducing the formation of NOx. While this sounds like it would have a big impact on performance, there is still plenty of air left over for combustion. The EGR pulls out a portion of what's exiting the exhaust ports and recirculates it back into the engine. For the most part, the EGR valve is attached to the car's exhaust header to capture the 2. JLM Diesel Air Intake & EGR Cleaner. JLM Diesel air intake cleaner & EGR cleaner provides strong cleaning ability and can restore engine performance. It removes stubborn dirt including rust deposits from the air intake and exhaust gas recirculation system and can remedy irregular idling and engine stalls. Exhaust Gas Recirculation (EGR) is an emission reduction technique used in internal combustion engines. It works by diverting a portion of exhaust gases back into the engine's intake manifold. This process lowers combustion temperatures, reducing nitrogen oxide (NOx) emissions and improving fuel efficiency. EGR is a vital component in modern The Exhaust Gas Recirculation or EGR system is one of several vehicle emission control systems. It helps reduce the amount of the nitrogen oxides (NOx) in the exhaust gases. Nitrogen oxides are normally formed in the process of combustion in the engine cylinders. EGR system. If there’s a discrepancy between commanded and actual, the PCM will set a P0404 EGR circuit range/performance. Diesel EGR valve. Diesel engines produce far more soot than gasoline engines. So modern diesel vehicles employ a diesel particulate filtration system to remove the soot. If the soot-laden exhaust is routed directly into the Apr 1, 2008. In the diesel performance world, Ford 6.0L Power Stroke engines have a bad reputation for blowing head gaskets and sticking EGR valves when owners modify them. There are a number of EGR also increases ash and soot in the oil. SCR: How It Works. With SCR or Selective Catalytic Reduction, the nitrogen oxide (NOx) reduction process takes place after combustion - so as to not diminish engine performance. The process is simple: diesel exhaust fluid (DEF) is sprayed into the hot exhaust gases. An EGR valve, or exhaust gas recirculation system is a primary component of an engine’s emissions system on petrol and diesel powered vehicles. Its purpose is to reduce NOx emissions by recycling a proportion of the combustion gases that normally exit through the exhaust. A valve is used to control the flow of gases, which are re-routed First remove the engine cover. Then loosen the electrical cable on the valve and remove the electrical connections and/or vacuum lines, checking for signs of damage. Remove the fastening screws and check the valve for damage, corrosion or carbon build-up. Clean the EGR valve mounting surface thoroughly and fit new valve and gasket. hNRl.