#1 · Jan 11, 2015 Hi all.. I have a 2011 Tucson. I could hear what sounded like a ticking/light knocking coming from my engine this morning so I removed the oil cap and air is blowing through like crazy. I pulled the pcv valve out and it sucked just fine. It's not smoking or burning oil... 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.

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Oil Breather/Vent Cap FAQs (Frequently Asked Questions) Compressor Pump Blowing Oil Out of the Breather Hole. by Johnny (Cedar Bluff, VA) I have an older model Speedaire air compressor with a Speedaire 2Z499B compressor pump. I let a friend borrow it and he somehow lost the breather to it and now it blows oil out of the hole when running.. While air coming out of the oil cap can be normal, it can also signal a huge problem. Check out this guide to help you discover the reason your Honda Accord is leaking air, and how to resolve the issue. By Brett Foote - March 30, 2015 This article applies to the Honda Accord (1990-2002).