Exhaust Pressure Regulator Vacuum Valve: Description and Operation

The Electronic Vacuum Regulator (EVR) is an electromagnetic device which controls vacuum out-put to the EGR valve. The EVR replaces the EGR Solenoid Vacuum Vent Valve Assembly (9D474). An electric current in the coil induces a magnetic field in the armature. The magnetic field pushes against a spring loaded disc increasing the vacuum level. The vacuum source is either manifold or port vacuum. As the current is increased an increased vacuum signal goes to the EGR.