[s-cars] By-pass valves

qshipq at aol.com qshipq at aol.com
Thu Aug 12 07:20:51 PDT 2010

 On a stock plastic Bosch valve you shouldn't even get a single pump off a mity-vac without the diaphram lifting = 2 bad BPV in your possession


-----Original Message-----
From: dgraber460 at aol.com
To: qshipq at aol.com; djdawson2 at aol.com; benswann at verizon.net; esanborn at gmail.com
Cc: s-car-list at audifans.com; quattro at audifans.com
Sent: Thu, Aug 12, 2010 9:10 am
Subject: Re: [s-cars] By-pass valves

Thanks Scott, Dave, et al;
I understand the Bosch Audi OEM's operation pretty well as described by Dave and Scott.
Having said that, my question was, and is, should the OEM plastic valves open on the bench with vacuum applied to the small control port? The Forge aluminum valve does, but neither of my OEM plastic units will, and I hear what seems to be air bleeding by the diaphragm when vacuum is applied.
They have never (at least in my ownership) been installed backwards, but wondering if they need to replaced and tossed, or if they are as normal for a stock OEM. I'm guessing from this behavior that the diaphragm is ruptured and they are toast?



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