<div dir="ltr"><div>I have the back cover off , the one with the PCV pipe. I looked at both ports, to the trans modulator and both are after the throttle plate. Both ports are also 5/16" OD but inside the ID is very small , small enough only a small wire , can't get a pipe cleaner through them. I have mine Teed together the one facing down at the throttle end and the one facing out with the runner pipe RT side . I didn't go over the top in the runner pipe for 1&2 mine both run down long hose on the front one the tee is a few inches back from #1 runner pipe. <br></div><div><br></div><div> Tram one of the Samba members is sending me one which has only one modulator pipe next to the AAR fitting. I imagine one will work since earlier models like 71 only had one minus the PCV pipe. I have a 72 model year on the car now the only difference between it and the 73 , no EGR pipe ,it's blank there, the extra vacuum port the the dual port vacuum can , it does have the PCV pipe on the back cover. It seems only late 72 and all 73 have the PCV pipe, well at least CA built cars , as far as I know the EGR was only used on 73 CA built cars. <br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jul 18, 2023 at 9:49 AM Jim Adney <<a href="mailto:jadney@vwtype3.org">jadney@vwtype3.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On 17 Jul 2023 at 14:32, William Jahn wrote:<br>
<br>
> I was curious why there are two ports tee'd together on 72 and 73 fuel<br>
> injected Auto trans models which seem to be California built cars. The is a<br>
> CA built and Federal . I looked at mine and both ports are after the<br>
> throttle plate.<br>
> <br>
> Do I need two for the trans to shift? Or will one do? I cannot find any<br>
> info on this.<br>
<br>
I don't know. Mine is the same and it's always bothered me, too. I THOUGHT <br>
one of the ports was in front of the throttle plate, at least at idle, but I haven't <br>
spent any time studying it. I've never seen any info on this.<br>
<br>
I've always wondered if there was an orifice somewhere in the conductance <br>
between those two ports, but I've never taken anything apart.<br>
<br>
On mine, one of the hoses wraps over the top of the #2 air runner, and time <br>
has crushed the hose flat there. I've wondered if this means that that hose is <br>
no longer working. Everything still works, except that the 2nd to 3rd shifts <br>
tend to slip unless I'm accelerating hard. No problem with 1st to 2nd or on <br>
any downshifts.<br>
<br>
-- <br>
*******************************<br>
Jim Adney, <a href="mailto:jadney@vwtype3.org" target="_blank">jadney@vwtype3.org</a><br>
Madison, Wisconsin, USA<br>
*******************************<br>
<br>
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