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 ...

Venting a typical V-8 engine isn't a complex affair. A breather atop each valve cover is usually all that's needed. Of course, replacing one with a PCV valve to introduce a bit of vacuum into the ...

You take your car in for an oil change. The work is almost done when the technician comes out to talk to you. Hes holding your air filter and PCV valve and recommending that you replace both because ...