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 ...

The Positive Crankcase Ventilation (PCV) system rarely gets attention until something goes wrong, but mechanics are ...

We don't mean to be the harbingers of doom, but it's unwise to keep driving if your car's engine has a malfunctioning positive crankcase ventilation (PCV) system, particularly a bad PCV valve.

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 ...