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Any pressure will become evident as soon as the engine is turned on--what they are pointing to, is that
the pressure to just partially inflate the balloon is evidence the pvc system needs work.
I would guess that when trying this procedure on our cars--if the ballon trys to be sucked into the
dipstick hole just a little that all is OK--if it's being sucked in at a high rate though the ccv could be going bad.
 

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CN90--don't know about you M52--but my M54 has always had vacuum at the dipstick as well as the valve cover oil cap--on the later engines there is a vacuum directed into the crankcase via the valvecover gasket
the oil dipstick tube has two different channels in it to allow oil to drainback and the dipstick itself.
One of the big problems that must be watched out for when doing the ccv valve work on the M54 engine
is to make sure the dipstick tube 0 ring is seated properly when doing the reinstall and ensureing there isn't a vac leak there. Vacuum is introduced into the crankcase from the distribution unit--then to the ccv and from there to the valve cover.
 
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