Well a pcv valve recirculates unburned gases back into the engine to be reburned. A plugged pcv can cause rough engine idle and several other problems such as engine damage so its very important that its working well because if it is not it needs to be fixed.
Pcv valve needs changing
It is very important to change PCV valve. If valve is old it will plug or seize. This will cause oil pressure to rise and may cause leaks. Most likely the valve cover gaskets will leak if PCV valve is plugged.
Pull upward on the hose that the PCV valve is in. The PCV valve will pull out of the hose. The PCV valve is located in the valve cover.
Disconnect the PCV valve tube from the PCV valve.Disconnect the PCV valve electrical connector if it has one.Turn the PCV valve counterclockwise to remove from the valve cover.To install, reverse the removal procedure.
According to a Nissan forum , it is located behind the alternator, above the oil filter. It's also important to check the PCV filter, which is a rectangular piece of mesh located inside the air filter housing. I can get plugged, reducing the airflow to the PCV valve, or (easily) go missing when changing the air filter.
Remove the PCV valve retaining screws. Remove the PCV valve hose. Reverse the process to install the new PCV valve.
The PCV valve has a check ball in it, That's what you are hearing. REPLACE PCV VALVE
The pcv valve is on the passenger side valve cover
The PCV valve is located in the valve cover
The PCV valve is located on the top of the valve cover. To test the PCV valve, start the engine, pull the valve out of the valve cover and put your thumb over the hole in the end. If you hear a little click, then the PCV valve is good. If there is no vacuum at the hole, either the valve is bad or the hose is bad. To see if the hose is bad, pull the hose off and put your thumb over the end. If there is vacuum, replace the PCV valve. If not, replace the hose. It's important to note that PCV valves are sized for specific engine applications. The wrong PCV valve for an application can flow too much or too little air causing driveability problems.
The PCV valve on q 2007 Torrent is made into the valve cover. It is not removable, the valve cover and PCV valve must be replaced together.
PCV valve (A)