Bonneville V6-252 4.1L (1982)
Manifold Pressure/Vacuum Sensor: Description and Operation
Vacuum Sensor
NOTE: If vehicle is not equipped with a MAP sensor, it may be equipped with a vacuum sensor--some systems may not use either.
Sensor produces low voltage--approximately 1 volt--when manifold vacuum is low, and higher voltages--approximately 4.5 volts--when vacuum is
high.
Normal output is 0.54-0.62 volts with ignition ON and engine stopped.