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What do EGR Valves do?

The exhaust gas recirculation (EGR) valve in a vehicle reduces nitrogen oxide emissions by directing some of the exhaust gas back into the engine cylinders.

The EGR valve is vital to your vehicles emission controls. If the exhaust gas return EGR system is functioning correctly it should have no noticeable effect on engine performance. If however, the EGR system is leaking or inoperative, it can cause reduced performance and driveability problems, including hard starting, rough idle, stalling, increased fuel consumption, valve knock, poor acceleration, detonation (knocking or pinging when accelerating or under load), elevated NOx emissions and even elevated hydrocarbon (HC) emissions in the exhaust.


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It is possible with exhaust gas return EGR systems to reduce these NOx pollutants by up to 50% and also to reduce soot particulates on diesel engines by up to 10%. Modern engines are equipped with reduction catalysts and fuel injection systems that keep the NOx compounds to a minimum. However, even with these more efficient systems, the EGR valve exhaust gas return system is still necessary to reduce the excess emissions.

EGR valves were first introduced in the early 1970’s and the exhaust gas recirculation EGR valve system is a proven method of emission control for both petrol and diesel applications. Due to the technological advances achieved in EGR control and catalyst technology, cleaner exhaust has been achieved even under lean-burn conditions.

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