When air blows out of the oil cap, it could be an indication of a problem with the engine. Below are some of the common causes of air blowing out of the oil cap: PCV Valve: The Positive Crankcase Ventilation (PCV) valve is responsible for regulating the pressure inside the engine.. 1089 posts · Joined 2018. #7 · Nov 29, 2023. Rather hard for blow by to push the oil cap out of its threads. One of the valve covers is vented to atmosphere by way of the PCV system's fresh air hose. If blow by gets to strong, this is where it goes. Perhaps the cap was not installed properly.

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Should Air Be Blowing Out of the Oil Cap? Modern engines are equipped with positive crankcase ventilation (PCV), which is critical in maintaining lower pressure in the crankcase than the atmospheric pressure. This role is attained under normal functions, which allow the different vehicle parts to function as required.. #1 This morning while the car was warming up, I decided that I would top off the oil because I knew it was about 1/4 of a quart low. I like to keep my vehicles at the MAX level. I took off the oil cap and started to pour in some oil just to find myself getting showered in oil. There was so much air that it sprayed the oil back at me.