Somerset V6-181 3.0L (1986)
EGR Vacuum Solenoid Valve: Description and Operation
This switch is used on some V8-350 diesel engines. When vacuum at this switch is below 8 inches Hg, the switch's electrical contacts are normally
closed. Regulated vacuum from the vacuum regulator valve is directed to the EGR-VS. When vacuum is above 8 inches Hg, the switch's electrical
contacts close and complete the circuit to ground. The EGR vacuum solenoid valve is energized allowing unregulated vacuum from the vacuum pump to
be directed through the EGR vacuum solenoid valve to the EGR valve.
