Electronic Vacuum Regulator (EVR) Solenoid
WARNING: This page is about a different car, the 1995 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
EVR solenoid is an electromagnetic device used to regulate vacuum supply to the EGR valve. EVR solenoid contains a coil which magnetically controls the position of a disk to regulate the vacuum. As the duty cycle to coil increases, vacuum signal passed through the EVR solenoid to the EGR valve also increases. Vacuum not directed to the EGR is vented to atmosphere.