Every engine has some sort of crankcase breathing system. The internal combustion process creates pressure, some of which makes its way past the piston rings-along with fuel vapors-and into the rest ...

Every engine, regardless of its condition, has a certain amount of blow-by or air/fuel mixture that slips past the pistons and rings and finds its way into the crankcase. In addition, during normal ...

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.

Reader John A. Turek, Jr. (Oakdale, Pennsylvania) has developed a unique streetable combination PCV smog/crankcase evacuation system that he says improved both the overall performance and driveability ...