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Home >> Dodge and Ram >> 1990 >> Caravan Base, 2.5 K, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Positive Crankcase Ventilation (PCV) System Test
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Positive Crankcase Ventilation (PCV) System Test

  1. With engine running at curb idle, remove PCV valve from grommet. If valve is functioning properly, a hissing sound will be heard as air passes through valve.
  2. With engine running, place finger over valve inlet. Strong vacuum should be felt at valve inlet. Stop engine. Remove and shake PCV valve to ensure a metallic clicking noise can be heard, indicating valve is free. Reinstall PCV valve.
  3. Remove the crankcase ventilation filter or oil filler cap from the valve cover. Hold a piece of stiff paper over the opening. After allowing about one minute for crankcase pressure stabilization, the paper should be drawn against the opening.
  4. If paper is held against opening, performance is okay. If not, replace PCV valve and retest. If performance does not improve, inspect system for restrictions and clean as necessary.
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