Originally Posted by Christian10
while investigating the source of this strabge sound we found out that when we take the oil fill cap the is an extreme vaccum sounds something like a powerfull vaccum cleaner then we also discovered that when the strange sound came in and we thake the oil dip stick out the sound goes away what could be causing this
When was the last time you messed with the UIM or PCV? You're missing the inner o-ring in the PCV housing.
Chances are you're missing the lower o-ring on the valve itself.