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The Exhaust Gas Recirculation (EGR) valve recirculates exhaust into the intake stream. Exhaust gases have already combusted, so they do not burn again when they are recirculated. These gases displace some of the normal intake charge. This chemically slows and cools the combustion process by several hundred degrees, thus reducing NOx (oxides of nitrogen) formation.

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โˆ™ 2013-07-22 21:36:44
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Q: What does an EGR valve do?
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