What are the symptoms of a faulty PCV valve in a car?

[AmyDella]

When the PCV valve fails, the engine may exhibit the following symptoms: engine shaking, unstable idle, and a large amount of white smoke emitting from the exhaust pipe. This can cause gases to remain in the crankcase, leading to corrosion, accelerated wear, and shortened engine lifespan. It may also result in difficulties starting the engine, idle shaking, weak acceleration, excessive oil consumption, and other issues. The valve is prone to clogging due to sludge buildup. Here is additional information: Main function: The PCV valve directs gases from the crankcase into the intake manifold, with a small amount of air entering the intake manifold directly from the air filter through the PCV valve. This prevents throttle icing, incomplete combustion, and worsened emissions.