16V auto passat TB - nipple for butterfly bypass?

[jdbubb at verizon.net (Dan Bubb)]

If you're talking about the 1/8" diameter or so nipple on the primary side 
of the TB then, no, it isn't open to the manifold side of the throttle 
plates at idle.
If you're talking about the 5/16" diameter nipple on the secondary side of 
the TB, yes it is open to the manifold at all times.
Dan

From: "Mark F." <mk1mark@gmail.com>
Sent: Tuesday, August 15, 2006 3:06 PM
Subject: 16V auto passat TB - nipple for butterfly bypass?


> Hi list,
>
> I'm having trouble establishing an idle on my ABA/JH swap.  I have
> installed a 16v auto passat TB for the idle/WOT switches (the only TB
> I had lying around that had them).  This TB doesn't have an idle
> adjustment screw, so I made my own with a bolt and a plastic "T" -
> plumbed in to take air from the bottom of the rubber boot in front of
> the TB and route it to the nipple on the TB.  The problem is that even
> with a totally clear tube in place ("T" removed) it still won't idle -
> no matter what ignition timing I try.  The idle valve (bolted to the
> back of the intake manifold) tested to work perfectly, and there are
> no vacuum leaks that I can see.  I have attempted to set the ignition
> timing at the lowest idle I can hold with the throttle cable, but
> since the idle switch isn't engaged (and not sending a closed throttle
> signal to the knock box) I doubt it's accurate...
>
> I've double checked the cam timing, and it's dead on.
>
> Any guesses what might be wrong?  Mayhaps that nipple isn't a butterfly 
> bypass?
>
> Thanks,
>
> Mark.
> 75
> 82
> 82 Caddy
> 93 Chevy/Kia 1/2 ton
>
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