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Crankcase Ventilation System Inspection/Diagnosis

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
Concern Action
External oil leak Inspect for any of the following conditions:
  • Plugged positive crankcase ventilation (PCV) orifice tube.
  • Plugged or kinked PCV hoses.
  • Damaged or incorrectly installed PCV hoses.
  • Excessive crankcase pressure.
Rough Idle Inspect for any of the following conditions:
  • Plugged PCV orifice tube.
  • Plugged or kinked PCV hoses.
  • Leaking or damaged PCV hoses.
Stalling or slow idle speed Inspect for any of the following conditions:
  • Plugged PCV orifice tube.
  • Plugged or kinked PCV hoses.
  • Leaking or damaged PCV hoses.
High idle speed Inspect for a leaking or damaged PCV hoses.
Sludge in the engine Inspect for any of the following conditions:
  • Plugged PCV orifice tube.
  • Plugged or kinked PCV hoses.
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