EGR stands for exhaust gas recirculation, and the EGR valve is part of a system that recirculates exhaust gas back into the engine’s intake manifold for a return trip to the cylinders it just left.

A comprehensive guide to 6.0 Powerstroke engine exhaust gas recirculation (EGR) removal: pros and cons, the best EGR removal ...

One of the emissions control systems designed to combat both of those issues is the exhaust gas recirculation (EGR) system. As the name implies, EGR systems are responsible for recirculating ...