exhaust gas recirculation / EGR Interaction of throttle valve and EGR valve. Opening of the EGR valve in the part load area. Closing of the EGR valve in idling and under full load. description ordernumber 454 see also: expansion-element regulator air flow adjustment by adequate shape of the air funnel air-flow sensor with fuel distributor K-Jetronic injection-timing device of an in-line pump