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Home >> Ford >> 1981 >> Cutaway 6.6L Eng VIN Z >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> DECEL Throttle Modulator >> Testing >> Ported Vacuum Switch Test
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Ported Vacuum Switch Test

  1. Disconnect hose from PVS to solenoid vacuum valve and connect external vacuum source.
  2. Start engine and let it idle long enough to reach normal operating temperature. At normal temperature, there should be vacuum indicated on gauge.
  3. If no vacuum is present, check vacuum hose for leaks. If hose is not leaking, replace the PVS. Reconnect vacuum line.
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