If your car has a PCV valve, and if your engine has been idling roughly or a malfunction indicator light goes on, check the valve.

Among other things pertaining to the health of your engine, replacing your vehicle's PCV valve is a regular item of maintenance that's pretty simple to do.

The positive crankcase ventilation valve releases exhaust gas and unburned fuel from the engine block into the intake manifold. All engines allow some exhaust gases, unburned fuel and oil to ...