I have a 1600cc dual port engine with the 34pict3 carb, and keep it as stock
as possible. One line runs from a port to the vaccum advance. One runs to
the temperature sensor in the stock breather then to the door to feed it
warm air when the engine is cold. My manual also mentions the EGR, but my
car does not have it. I've always assumed that was the one that is capped
off.

I'm in agreement with everyone else. Cap off any vaccum sources that are not
used. The one capped connection in mine appears to have been that way since
the factory. Probably due to options used on different cars so they could
use the same carb.

"GaryH" > wrote in message
om...
> Thanks. I appreciate you looking into it.
> Gary
>
> "69' Dune Buggy 1600cc" > wrote in message
> oups.com...
>> Gary,
>>
>> I just looked this up in the VW manual. Naturally they have pictures
>> of the NORMAL carbs 30pict, 34pict but nothing like you mentioned.
>> HOWEVER, they do talk about the EGR value(Exhaust Gas Recirculation)
>> and testing proceedures. That devices is hooked to the carb to pull in
>> and REBURN emissions. Also, an autostick tranny requires two vacuum
>> connects, one manifold to supply the muscle to power the clutch, and
>> the other (carb connection) to help assist disengaging the clutch. I
>> have an autostick, but lack a seperate port so it's tee'd into the
>> advance line...
>> OK, so all this said the two ports on the side of your carb will
>> control the distributor advance, and EGR emmission along with any
>> control for the autostick. Those ports if not used should be plugged.
>> You can plug them, start your engine and manually open the throttle a
>> bit and then remove the cap and feel the suction, the advance will kick
>> in once you open the throttle so you should be able to pick out which
>> one of two is TRUELY advance. The other one could have suction all the
>> time, I'm not sure on how the EGR circuit is plumbed. Hope this helps,
>> the book really doesn't go into detail on your specific question.
>>
>> Scott
>>
>
>