No matter how tightly within the prescribed specifications an engine's piston clearance and ring tension are in its cylinders, a certain amount of fuel and combustion vapor slips past and enters the ...

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. Car manufacturers suggest that PCV valves be cleaned or replaced ...

Although some maintenance schedules include an interval for replacing the positive crankcase ventilation, or PCV, valve, others may not. In the latter case, a general recommendation is to replace the ...

Positive Crankcase Ventilation—three dirty words, but do they really need to be perceived that way? In general, the PCV system has two main functions: vapor relief and liquid separation. PCV systems ...