Capri V8-302 5.0L 4V HO (1984)
Barometric Pressure Switch: Description and Operation
Fig. 15 Ignition barometric pressure switch
This switch, Fig. 15, controls spark timing and/or other electrical devices according to altitude. Calibration resistors in the switch assembly cause the
ignition module to vary the spark timing. Spark timing is advanced for vehicle operation above a predetermined altitude and retarded for vehicle
operation below a predetermined altitude. Some switch assemblies control both spark timing and another device while other switch assemblies control
only one or the other.