"California" Bocar 34Pict3 vacuum connections

Plug the other ones if you have s stripped down system. One is intake manifold vacuum, one is distributor advance that will pull in (vacuum can on distributor) when you open the throttle. The other one is probabally for recycling emission to help keep that California air sparkly clean. I have a non-Cal version with both of mine capped off. You also have a smaller main jet which puts less fuel in the mixture which will run hotter and help burn more pollutiants. I do have a VW manual that might have exact configuration if your system requires that. Let me know if you need it, other wise cap it off would be my quess.

SW

Actually, the cali version I have has very different hose connections than you are talking about. I have the same one on the front but I don't have the one on the side for the advance. Instead I have two other ones and they come out where the 2 jets are (one on each side of the bowl). Before I plug them up I would like to know what they are for and how they were intended to be used.

Thanks, Gary

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

Thanks. I appreciate you looking into it. Gary

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.

Basically, what you have a the Mexico version of the 34 pict, although not quite. It should have the vacuum port on left for the distributor, but if you don't need it then it won't matter (but you might wish you did have it, later). The port at the rear, half way up, is for the thermostatic valve in the air cleaner. The two others, bottom left and top right are for the Mexican altitude corrector (due to Mexico City being so high up). I believe that if you plug these two ports, the jet will act at their base setting for sea-level.