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Modulator Valve
- If necessary, remove modulator valve to access all vacuum fittings. Remove all hoses. Plug modulator No. 1 and No. 2 ports. Blow into hose located on bottom exhaust fitting of modulator to close diaphragm bleed. See Fig 1
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- With a hand-held vacuum pump, apply 7 in. Hg to port No. 3 of modulator. Vacuum should hold. Release pressure from exhaust fitting hose to open diaphragm bleed. Vacuum on gauge should drop. If valve does not perform as stated, replace modulator valve.
Courtesy of FORD MOTOR CO.