[T3] my long term issue have to unplug TS1 for a smooth idle.

[William Jahn]

The MPS that was on my 73 when I got it was a 106 . It was screwed together
had the black cap and the adjustment screw was slotted and it still had the
epoxy to prevent one from adjusting it. Yet the ECU was the 048. I worked
fine for years and I had the D map tied next to it and at that time the
idle and running acted the same and that was on a 600 mile round trip. That
was 1991 we still had leaded fuel here. I didn't know a thing about part
numbers I had no internet they just looked the same. The 106 looked like
someone had it apart because two of the screws were stripped and it looked
old and I could just pull off the black cap. It was like they used two to
make one. It still had the VW number 311 906 051 E and the Bosch # ending
in 106.

On Mon, Sep 30, 2019 at 2:52 PM Jim Adney <jadney at vwtype3.org> wrote:

> On 30 Sep 2019 at 11:34, William Jahn wrote:
>
> > The D unit is a 311 906 051D/ 0 280 100 101 , it's the exact same unit as
> > the 311 906 051E/ 0 280 100 116. Both have the same nose and have no full
> > load enrichment in the MPS and no slots in the cover and both have the
> > black plastic cap and the ground wire tab which none of the others had.
> If
> > one were to remove the numbers one could not tell the D from the E . When
> > I installed the E it didn't change how it ran at all.
>
> Okay, William emailed me photos of his D MAP sensor. He's right and I was
> wrong. I had to go back to the Bosch literature to find the data and I see
> that
> I had gotten this completely wrong from the start. The D sensor was used
> on
> VW Type 3s in Europe starting on 7/71.
>
> In other words, the European '72 models got the 101, D,
>
> and the US/Canada '72 models got the 106, E.
>
> Then, in '73, everyone got the 116, E.
>
> These would all have had the black plastic tamper-proof cap and a single
> adjustment screw,
>
> I went downstairs to see if I could find the D MAP sensor that I thought I
> had
> and I came up empty. What I DID find was a Bosch box for a 101 MAP
> sensor which also had a VW dealer sticker on it with a C suffix, which
> makes
> no sense at all. It does, however, seem to indicate that VWoA was
> importing
> that part at some point in time.
>
> Going thru this I also realized that in an earlier reply I mentioned the
> early,
> '72 E as a 016. That was wrong, 106 is correct.
>
> The list of numbers to remember grows longer even as my memory grows
> shorter....
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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