[T3] I wanted to ask on the early FI auto trans IAD

William Jahn willjahn975 at gmail.com
Thu Jul 27 16:37:05 PDT 2023

Thank you, that clarified part of it. I have 4 now. All I can say is the 73
is just like you described. I have one off a 72 auto trans and it's exactly
the same as the 73 minus the EGR  pipe and the addition of the second
vacuum port for the 72 only dual port vacuum can. Both have the PCV pipe.
One I got from ISP west I can tell it's a 72 manual trans because it has
the one lever arm and the added 2nd retard port off the bottom and it has
the PCV pipe and the MPS port is on top on the left , temp sensor on the
right , it has the dashpot thing bolted to two studs where the EGR pipe
would fit but no auto trans port .
 The one I got from Tram has the PCV pipe , the correct auto trans lever
and the spots to mount the kick down switch, no EGR pipe and it has the MPS
bottom left and Auto trans port on the bottom right , and temp sensor top
right .

 What I was looking for was one that had no shaft play at all and both of
these do not . I guess I'll try the one Tram sent since it has what I need
. They all seem  to be later because all do have the PCV pipe on the back
cover and this was not on any before 72 that I know of.  I  can see the PCV
back cover is original on all 4.

 I am not sure how liquid oil finds its way in the MPS hose oher than just
heat the oil bath has while running or an overfilled oil bath or one with
to thin of oil , Mine did have oil in the IAD , the 72 I used last time I
replaced the runner hoses and intake gaskets and all fuel and vacuum lines.
That took a long time to get that way and it's still clean inside since I
did this at the end of 2019. Now however the 72 IAD is so worn at the shaft
it's useless and probably the source of the high idle/ vacuum leak.

On Thu, Jul 27, 2023 at 3:19 PM Jim Adney <jadney at vwtype3.org> wrote:

> On 27 Jul 2023 at 13:02, William Jahn wrote:
> >  Are these on 70 and 71 and some 72 models? Where the Temp sensor is on
> the
> > left side and the MPS is on the right facing the rear of the car ? I
> can't
> > remember what year Jim has.
> The intake air temp sensors on the IAD are on the left on '70-2 models and
> on the right on '73s.
> '69 AT IADs had no temp sensor. That sensor stuck into the engine case and
> took the place of the front AAR stud.
> > All I do know is the one Tram from Samba sent me has the sensor on the
> > left side and the MPS comes off the bottom left and auto trans port is
> next
> > to the mps port but faces the right. Wasn't there some idea to run the
> > line up higher to prevent oil vapor from entering the MPS?
> That would not be a '73 IAD. Must be a '72 or earlier. Only the '73 AT IAD
> has the TWO AT Vacuum Modulator ports. I don't know why.
> I probably have a correct '73 AT IAD. Let me know if you want me to check.
> '73 moved the Pressure Sensor port to the top. Oil VAPOR is still able to
> get
> there, but any LIQUID oil which has collected on the bottom of the IAD
> won't
> be able to get into the Pressure Sensor hose.
> Oil vapor still manages to get into the Pressure Sensors and condense
> there, but it doesn't seem to cause any problems. I used to clean those
> out
> regularly, but there was seldom very much, and removing it never made any
> difference.
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
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