How Does Exhaust Gas Recirculation Work?

Exhaust gas recirculation (EGR) is a key emissions-control technology used in modern vehicle engines. By returning a portion of an engine’s exhaust gas back into its intake, it’s possible to significantly reduce both unburned hydrocarbon and carbon monoxide emissions.

This process not only results in cleaner air but also allows vehicles to meet increasingly strict emission regulations while delivering fuel economy improvements that help save drivers fuel costs—especially over long distances!

However, there are some downsides to using EGR that consumers should be aware of before purchasing an automobile or light truck with an engine featuring exhaust gas recirculation technology.

Advantages of EGR

Most modern engines use exhaust gas recirculation to reduce emissions. In fact, it's one of the cleanest ways to reduce NOx and CO emissions in a diesel engine.

However, poorly-operated EGR valves can lead to increased turbocharger wear and decreased fuel economy.

Disadvantages of EGR

Exhaust gas recirculation (EGR) is a technology that reduces emissions of nitrogen oxides (NOx) by diluting them with inert exhaust gases.

NOx emissions are reduced, but unfortunately so are combustion efficiency and fuel economy. This can be seen as a disadvantage because to achieve desired levels of efficiency, more fuel has to be burned; therefore reducing fuel economy.

In addition, when you push on your vehicle’s throttle it’s also important to know how much air and how much fuel your engine receives.

High amounts of air will cause poor MPG due to excess air being used for inefficient combustion.