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Home >> Ford >> 1990 >> Bronco II RWD, Standard, M5OD-R1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> PCV Valve
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PCV Valve

  1. Remove PCV valve from valve cover grommet. Shake valve. Valve should rattle when shaken. Start engine to normal operating temperature. On models with 2.9L and 4.9L engines, remove corrugated hose from oil separator nipple. Place stiff piece of paper over nipple end and wait one minute.
  2. On all other models, disconnect hose from remote air cleaner. Place stiff piece of paper over hose end and wait one minute. Vacuum should hold paper in place. If not replace valve.
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