Air Blowing out of my oil Fill Hole (Oil Cap Removed)

I started my car and heard a tapping so I removed the oil fill cap and was blown away :044: lol Ive read i probably shouldnt do that while the car is running... moving on.....I took the oil cap off and it was blowing air if i had to guess it was beween 3-5psi Ive read its normal but how much pressure is normal?


PCV is connected and clear not sure if its completely clear but air moves threw it
Will Be Checn to c if the spark plugs are fouled in a few minutes
Compression test will happen pretty soon 1day-a week (Determine Blow-by, and if a valve is bent, ect ect)
anything else I should Chec while im waiting on a compression chec?

Normal dude, just a little crankcase pressure.

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^ Correct. Only so much........Check PCV valve. Maybe is not working properly. It should open and let vacuum suck the gas back to combustion. Just to be safe.