Cutlass V6-231 3.8L VIN A 2-bbl (1982)
Thermal Vacuum Valve: Testing and Inspection
EGR Early Fuel Evaporation TVS
Below the switching point;
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EFE and Manifold Vacuum ports should be open
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EGR and Ported Vacuum ports should be opened and vented through the Vent port
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Vent port should be blocked to the EFE port
Above the switching point;
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Manifold Vacuum Port--Should be blocked
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EFE port should be vented at the Vent port
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EGR and Ported Vacuum ports should be open, while the Vent port is blocked at the EGR port.
NOTE: Refer to the number stamped on the base of the switch or valve for calibrated switching or activation temperatures.