Century V6-181 3.0L VIN E 2-BBL (1982)
Thermal Vacuum Valve - Carb: Description and Operation
Purpose
The CVB-TVS provides a richer choke operation when the air entering the carburetor is less than the specified temperature.
The CVB-TVS controls the vacuum to the secondary vacuum break. When the engine is started and the air temperature is less than specified, the
CVB-TVS closes preventing the vacuum break from pulling, providing a richer start and improved driveability.
If the air temperature is greater than specified, both vacuum breaks pull the choke to its leanest position.