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Home >> Ford >> 1988 >> Bronco II 4WD, Standard, M5OD-R1 >> Repair and Diagnosis >> Engine Performance >> System >> EGR System >> Testing >> Ported Vacuum Switch >> PVS with 4 Connections
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PVS with 4 Connections

  1. Disconnect vacuum hoses at PVS valve. Connect vacuum gauge to top port of PVS. Connect external vacuum source to second port.
  2. Start engine and warm up until engine operating temperature is reached. If there is no vacuum, this portion of PVS is damaged and valve should be replaced. If vacuum is present, proceed to next step.
  3. Connect gauge to third port and vacuum supply to bottom port. If vacuum is noted, PVS is okay. If no vacuum, replace PVS.
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