PCV Valve

The positive crankcase ventilation (PCV) valve controls the pressure of accumulating gases in the engine crankcase by venting them back into the intake manifold.

Symptoms of Wear or Failure

  • Engine may run rough or stall
  • Excessive oil consumption
  • Engine oil leak
  • High emission levels
  • Check Engine Light may illuminate

Related Repair Advice

  • The PCV valve should be replaced every 30,000 to 50,000 miles
  • The engine should be tested to verify normal operation after a PCV repair. This is to ensure that no additional problems exist that may have contributed to PCV failure.
  • A plugged PCV system can cause engine oil leaks. It's important that the shop checks and eliminates any issues with the PCV system while repairing engine oil leaks.