Sucking/blowing from the oil cap (not pcv or valve cover)

SethG said:

Hey, got a weird one for you all. The symptoms are much like the normal pcv or valve cover failure but I replaced the intake manifold and the valve cover a few days ago, and the orange nipple is there and the valve cover doesn't suck at the disk at idle.
My 2011 1.4 turbo eco model decided to vomit oil all over the passenger side of the engine. Turned out it was because the pcv was now missing, so the pressure would cause the oil to end up going into the corrugated hose and shooting out all over... Or what didn't continue into the turbo and then into the intake and engine. So I replaced the valve cover and did the V.3 upgrade. However that didn't fix it. So I took it off and replaced the intake manifold just to be safe. but the V.3 does replace the correlated hose. So now the oil just stays inside and goes into the turbo and so on.
The car also sputtering when I drive it. I went on a highway trip after installing and intake manifold and new valve cover but after 20 mins it said "ac off due to high engine temp" but the car never got hot. In fact the needle went from normal temp to 0 or cold. I pulled over and no signs of over heating (bubbling radiator fluid/glowing headers). I turned it off for 12 hrs and came back later. the ac off sign was still active. So idk. Also the oil was a bit over full before I started the trip. Still at the same level now. No change. Also it is sucking at the oil cap and dip stick. I even put a spare valve cover on that was also good just to check for cracks... Getting good at changing this valve cover quick lol
I know the valve cover and the pcv valves are only 2 of three check valves on that system (or I think). Could the turbo check valve (maybe solenoid also don't know) be bad. What does that part even look like.

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SethG said:

Maybe. But compression test passed. Maybe valves. I'll look into it

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• Allows coolant to leak into the engine oil – milky or frothy oil.
• Allows coolant to leak outside of the engine block – wet block or a sickly-sweet smell or smoke.
• Mixes combustion gasses into the cooling system (radiator) – bubbling / spitting out of cap.
• Allows combustion gasses/pressures to transfer between two cylinders– rough idling.
• Allows engine oil to leak outside of the engine block - wet block or smoke if hot.

• Are you loosing coolant without indications of a leak?
• Is the oil on the bottom of the oil filler cap foamy or milky?
• Is there water in the oil or is it milky colored?
• Do you have white exhaust smoke?
• Are there bubbles coming out of an open radiator cap?
• Are there bubbles coming out of the overflow or surge tank?
• Perform a pressure test on the cooling system – does it hold at least up to the psi on the radiator cap? With the spark plugs removed, can you see any coolant on the pistons? Is there a white chalky appearance to the plugs?
• Once the system is pressurized, how long will it hold the pressure?
• Perform a compression test on each cylinder and compare readings – a lower reading could indicate a gasket leak.
• Still not sure, perform an exhaust gas test on the coolant.