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The easiest way to check this is to pop out the PCV valve. Once it is out, inspect it for dirt or oil, and give it a shake - it should make a rattling sound if things are in working order.

It doesn't hurt to change your PCV valve after a period of time just to keep things running well.

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Q: How do you tell if a PCV valve is going bad in 04 Ford Freestar?
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