Can you cap PCV valve on truck?

Capping the PCV (Positive Crankcase Ventilation) valve on a truck is not recommended, as it can lead to increased pressure in the crankcase, oil leaks, and engine damage. The PCV system is designed to relieve pressure and reduce harmful emissions by allowing gases to be recirculated back into the engine. If the valve is malfunctioning, it's better to replace it rather than cap it. Proper functioning of the PCV system is crucial for engine performance and longevity.