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Repair Topics / PCV Valve

MORE: PCV valve questions and answers

PCV Valve - Positive Crankcase Ventilation Valve

This category contains featured questions as examples. They relate to most vehicles.

Question:
What is the purpose of the PCV valve and what are the symptoms when it goes bad?

Answer: PCV means positive crankcase ventilation. This valve uses vacuum from the intake manifold to draw the fumes from the crankcase.  Symptoms of a faulty PCV valve are poor idle and excessive pressure in the crankcase.



Question: 2001 Lincoln Towncar mileage: 98,000.  I am trying to find where the PCV valve is located. I checked the valve covers and the plenum, and I cannot locate it.

Answer:   It is behind the intake manifold near the valve cover.


Question: 2001 GMC Envoy mileage: 73,241.  Where can I locate my PCV valve?  I bought one at my local auto parts store and I can't find anything that looks like it. There are two hoses that lead into the valve cover. One can be removed to expose a silver tip that somewhat resembles the PCV that I purchased but it seems to be a different size.   The other hose, when removed, exposes a plastic piece that can be unscrewed to reveal three or four plastic prongs on the end. Could the PCV go in here?

Answer:  From what you describe, you found the PCV valve, the one with the silver tip.  The auto parts store may have sold you the incorrect part.

Repair Topics / PCV Valve

Look up your PCV valve question in our Car Repair forum section.

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