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Crankcase Ventilation System Inspection/Diagnosis

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Crankcase Ventilation System Inspection/Diagnosis

Concern Action
External oil leak Inspect for any of the following conditions:
  • Plugged positive crankcase ventilation (PCV) valve
  • Plugged or kinked PCV hose(s)
  • Damaged or incorrectly installed PCV valve or hose(s)
  • Excessive crankcase pressure
Rough Idle Inspect for any of the following conditions:
  • Plugged PCV valve
  • Plugged or kinked PCV hose(s)
  • Leaking (damaged) PCV valve or hose(s)
Stalling or slow idle speed Inspect for any of the following conditions:
  • Plugged PCV valve
  • Plugged or kinked PCV hose(s)
  • Leaking (damaged) PCV valve or hose(s)
High idle speed Inspect for a leaking (damaged) PCV valve or hose(s)
Sludge in the engine Inspect for any of the following conditions:
  • Plugged PCV valve
  • Plugged or kinked PCV hose(s)
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