The Exhaust Gas Recirculation (EGR) system is used
to reduce Oxides of Nitrogen (NOx) in the engine exhaust. This is
accomplished by allowing a predetermined amount of hot exhaust gas to
recirculate and dilute the incoming air and fuel mixture. This process
reduces peak flame temperature during combustion. The system uses a
vacuum-controlled Exhaust Gas Recirculation (EGR) valve, in order to
modulate exhaust gas flow from the exhaust manifold into the intake
manifold.
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