Somerset V6-181 3.0L (1986)
Thermal Vacuum Valve: Testing and Inspection
EGR Early Fuel Evaporation Thermal Vacuum Switch (EGR-EFE-TVS)
Below the switching point, the EFE and Manifold Vacuum ports should be open, the EGR and Ported Vacuum ports should be opened and vented
through the Vent port, and the Vent port should be blocked to the EFE port.
Above the switching point, the Manifold Vacuum port should be blocked, the EFE port should be vented at the Vent port, and the EGR and Ported
Vacuum ports should be open, while the Vent port is blocked at the EGR port.
