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In a 2006 Ford Escape 2.3, you'll find the PCV valve tucked under the intake manifold. PCV stands for Positive Crankcase Ventilation, a system that helps keep your motor oil in check. Your engine burns fuel, creating waste gases that mostly exit through the exhaust. However, some of these gases sneak past the pistons and end up in the crankcase where they mix with oil, forming sludge. This sludge can harm engine parts, causing corrosion and blockages in essential passages.
The PCV valve can be found beneath the intake manifold.