Electrical Vacuum Control Valve
- Electrical vacuum control valve may be either opened or closed at room temperature. It should be reversed (opened to closed or closed to opened) with engine at full operating temperature. While engine is cold, measure continuity across switch terminals. See Fig 1
. Note if switch is open or closed.
- Warm engine to normal operating temperature. Measure continuity across switch terminals again. Continuity should be opposite of cold condition. If switch continuity does not switch, replace valve. Check vacuum function of valve as described in VACUUM CONTROL VALVE above.
Courtesy of FORD MOTOR CO.