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Where is the PCV valve on a 2003 S10 pickup?

The PCV valve on a 2003 Chevrolet S10 is located on the valve cover. It's usually a small, usually plastic, valve with a single hose connected to it. The exact location on the valve cover will vary slightly depending on the engine (4.3L V6 or 2.2L L4), but it's always on the valve cover itself. You'll likely need to look closely and possibly consult a repair manual or online diagram specific to your engine to pinpoint its precise position.