Here some info regarding our (PCV = P
It´s a little plastic valve in the driver side valve cover, with a hose attached to it.
What It Does:
The PCV valve is designed to compensate the engine ventilation needs at varying engine speeds. It is operated by manifold vacuum which increases or decreases as engine speeds change.
A PCV valve should never be cleaned and placed back into service. Cleaning a PCV valve will result in a clean PCV valve, not a new PCV valve. There are contaminants that will remain in the PCV valve that can never be flushed out. Additionally, there is an amount of wear that will be experienced by the spring that cleaning cannot replace. The recommended replacement intervals are a maximum of 12 months or 10k miles (16000 km). Since vehicles and operating conditions vary, the valve may have to be serviced more frequently. If it is suspected that the valve is sticking or if there is evidence of sludge, the valve should be replaced. All hoses or tubes used in the PCV system should be cleaned and inspected. If any cracks or breaks are noticed in the hose, it should also be replaced. All hose connections should be inspected to assure an air-tight seal. -Mike