F 150 Heritage 2WD Pickup V8-4.6L SOHC VIN W (2004)
EGR Electronic Vacuum Regulator Solenoid: Description and Operation
EGR VACUUM REGULATOR SOLENOID
EVR Solenoid
Test Graph
EGR Vacuum Regulator Solenoid Data Chart
The EGR vacuum regulator solenoid (EVR), (Figure 92) is an electromagnetic device which is used to regulate the vacuum supply to the EGR valve.
The solenoid contains a coil which magnetically controls the position of a disc to regulate the vacuum. As the duty cycle to the coil increases, the
vacuum signal passed through the solenoid to the EGR valve also increases. Vacuum not directed to the EGR valve is vented through the solenoid vent
to atmosphere. Note that at 0% duty cycle (no electrical signal applied), the EGR vacuum regulator solenoid allows some vacuum to pass, but not enough
to open the EGR valve.
