Vacuum Transducer (On Computer)

Provides an intake manifold vacuum signal. The higher the vacuum, the more spark advance that is given. To obtain the greatest amount of advance for any inch of vacuum, the Carburetor Switch Sensor must be open for a specified time. The advance at this time happens slowly. If the carburetor switch closes, the advance is cancelled. When switch is reopened, the build-up of advance must start all over again on most models, as most systems do not have accumulators.