A leaking or misplaced gasket to a valve cover or intake manifold can leak enough air to render the PCV system inoperable.

Question

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A leaking or misplaced gasket on a valve cover or intake manifold can allow unmetered air to enter the engine, disrupting the vacuum needed for the proper operation of the Positive Crankcase Ventilation (PCV) system. This can lead to the PCV system not functioning as intended.

A Leaking or Misplaced Gasket to a Valve Cover or Intake