What is Exhaust Gas Recirculation? 

An EGR system reduces emissions of nitrogen oxide produced by internal combustion engines. Nitrogen oxide is harmful and contributes to air pollution and environmental damage. The EGR recirculates a portion of the engine’s exhaust gases back into the combustion chamber, where they are mixed with fresh air and fuel during the combustion process, this reduces the gases released into the environment.

How does EGR work?

The EGR system is effectively a recycling program for your car’s engine. Instead of releasing all the gas into the atmosphere, a controlled amount of exhaust gas is redirected from the exhaust manifold back into the intake manifold, where it mixes with the incoming air-fuel mixture going back into the combustion chamber. This mixing lowers the temperature inside the engine, which in turn reduces the formation of nitrogen oxide.

Components of the EGR System

The main component of the EGR system is the EGR Valve this opens and closes to regulate the flow of gas into the intake manifold. It does this based on signals from the engine control unit (ECU) to maintain the desired EGR flow rate. Some vehicles also have an EGR Cooler which the exhaust gases pass through, this lowers the temperature of the recirculated exhaust gases before entering the intake manifold

Benefits of EGR

The main benefit of an EGR is of course the lowering of nitrogen oxide emissions into the atmosphere, therefore reducing the car’s environmental impact. Another key benefit is enhanced engine performance, allowing the engine to run smoother and prevent issues. Along with making the combustion process more efficient to improve fuel efficiency.

Challenges of EGR

Over time, carbon deposits can build up in the EGR valve and passages, which may require some attention to keep your vehicle running smoothly. If an EGR isn’t working, it can lead to performance issues such as slow acceleration, poor fuel consumption and increased emissions.