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Where is the PCV valve on a 1997 ford f150 4.2 engine?

The PCV valve on a 1997 Ford F-150 with the 4.2L engine is located on the passenger side valve cover. It's a small, usually plastic valve with a hose attached to it. It's often near the back of the valve cover, but the exact location might vary slightly depending on specific model variations. You'll likely need to look closely at the valve cover and its surrounding hoses to locate it.