SOURCE: exaust preasure coming from oil fill cap and a noisy tapping sound
that not good . your motor is on it way out.
SOURCE: Hose below oil fill cap
It vents blow by cases from the crankcase back into the engine its part of the PCV (positive crankcase ventilation system). If it is split not a big deal hardware stores carry lots of hoses like that there about 50 cents per foot.
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