EGR Valve: Description and Operation

Fig. 6 EGR control valve.:

Fig. 7 EGR control valve.:

Fig. 8 EGR control valve.:

Fig. 9 EGR control valve.:

Fig. 32 EGR control valve.:

Fig. 33 EGR control valve.:

This valve, Figs. 6 through 9, 32 and 33, controls the quantity of exhaust gas recirculated to the intake manifold. It is operated by vacuum created by the opening of the carburetor throttle valve except on vehicles with diesel engines.
On Pickups equipped with diesel engines, the vacuum is created in response to a sub-venturi vacuum signal that is amplified by a vacuum amplifier.
On Maximas and Sentras equipped with diesel engines, the vacuum is applied in response to the operation of the solenoid valve.
EGR control valve construction and type vary according to year, model, transmission type and vehicle destination. For identification purposes, the part number is stamped on the top of the valve.