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Home >> Cadillac >> 1983 >> Cimarron Automatic >> Repair and Diagnosis >> Engine Performance >> System >> PCV System >> System Testing
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System Testing

  1. Start engine and warm to normal operating temperature. Engine should be running at curb idle speed. Remove PCV valve from its mounting.
  2. If valve is functioning properly, a hissing noise will be heard as air is drawn through valve. Place finger over PCV valve inlet. A strong vacuum should be felt.
  3. If no vacuum is felt at PCV valve, check for blockage or restriction in PCV valve hose. If hose is okay, replace PCV valve. While finger is over inlet of valve, check for vacuum leaks in hose and at all connections.
  4. Turn engine off. Remove PCV valve from hose. Shake PCV valve. A clicking noise should be heard when shaking valve, indicating valve is free. If no clicking noise is heard, replace PCV valve.
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