It's supposed to do that.
The part you are referring to is called a "Flame Trap" - it is part of the positive crankcase ventilation (PCV) system. When it fails it causes too much suction in the crankcase, usually resulting in a nasty squeal or howl at idle that goes away when you remove the oil filler cap. Replacing it requires removing the intake manifold. My dealer quoted $450.00 for the job ($100 for parts and 3 hours labor).
Positive Crankcase Ventilation Answer 2: The Positive Crankcase Ventilation (PCV) system reduces hydrocarbon emissions by scavenging crankcase vapors. It does this by circulating fresh air from the air cleaner through the crankcase, where it mixes with blow-by gases and is then rerouted through a PCV valve to the intake manifold. - Haynes Repair Manual #36071
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