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16V auto passat TB - nipple for butterfly bypass?
Wutup, Markus -
A couple things I ran into:
Actually, first a question - are you running KS ignition?
- nipple is not a bypass (at least on my T/B). The screw depth modulates how
much air gets by at idle - there should be a gap in TB mounting plate
illustrating this. I can't imagine why yours wouldn't have the screw. Get an
Audi 80 TB - has everything you need and the switches too...The T/B is still a
work in progress on my swap. I made a custom linkage with a heim joint to clear
the rain tray (using a fox manifold w/ coldstart injector relocated to OEM
location). I sawed off some of the stalk for the idle screw but cut too much
off! DOH! now the screw backs out after lots of miles... :-/
- I accidentally unplugged the O2 control unit. It makes it idle like crap if
at all!
Not sure if that helps, but good luck w/ it - JT
> 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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