What Is a PCV Valve in a Car Engine? | Stop Oil Leaks And Rough Idle
A PCV valve meters blow-by vapors out of the crankcase and back into the intake, keeping pressure, oil mist, and sludge in check. Your engine is never perfectly sealed. A small amount of combustion gas slips past the piston rings on every drive. That “blow-by” carries fuel vapors, moisture, and pressure into the crankcase, right […]
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