Can a bad PCV valve cause blow-by?
Can a bad PCV valve cause blow-by? Answer: If the PCV system is plugged, pressure in the crankcase will build and may cause a dipstick to blow. Answer: If the valve fails, pressure can cause acid vapor through the breather element. It'll combine with the air-fuel in the intake; after some time you may see buildup. Why is my engine blowing oil out breather? Good Luck! most small engines will do this IF for some reason the max speed adjustment has moved... try using it with the speed control at 90 % not at max.. see if it stops the...