How Does an EGR Valve Work?

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EGS Work:

The majority of contemporary diesel vehicles incorporate EGR valves into their design to scale back NOx emissions and so meet stringent emissions regulations. EGR systems recycle some of the exhaust gas into the combustion chamber, where it combines with fresh intake air.

This lowers the Oxygen content and increases the water vapor content to the combustion mixture which reduces peak combustion temperature. Because more NOx is formed as peak combustion temperature rises, the EGR valve effectively reduces the number of NOx produced by the engine.

The EGR valve begins working once the engine is started, attains the proper operating temperature, and speed increases. Gradually, the EGR valve regulates the flow of exhaust gases. Once you block and also the engine stops, the EGR valve will return to its closed position and stop the flow of exhaust gases.

 

Problems with an EGR Valve:

A frequent problem with the EGR valve is sticking thanks to a build-up of carbon deposits. In worst cases, the EGR valve and EGR passages are often completely blocked, preventing the method of recirculating the exhaust gases.

Clogged EGRs are often the reason behind black smoke escaping the exhaust, additionally to increased fuel consumption or reduced performance. If the EGR valve fails to open or close, the ‘check engine’ light will illuminate on the dashboard.

A fuel odor smelt from inside the vehicle is additionally an indication of a failing EGR valve as more hydrocarbons are going to be emitted through the exhaust because of the rise in fuel consumption. The smell is well noticeable thanks to its irritating nature because it can result in human health issues.

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