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

William Jahn willjahn975 at gmail.com
Mon Sep 30 13:16:29 PDT 2019

 It started right up . I drove it for 45 minutes and it seemed to have
better pickup . Once I got home I first checked TS1 and read 120 ohm left
the engine running . TS2 read 65 ohm ohm right after shut down.

 The idle didn't hang like it did before. Still when I first started it the
RPM was a bit higher than 850 it increased by 50 RPM and it then climbed to
1200 seems there is a lag before the AAR brings the idle up yet it does get
to 1200 faster. I'm not sure if its to rich starting cold or what it is. To
be honest it's been so long all I can remember is I'm pretty sure when I
used to start it cold the idle was always 1000 RPM in park and only changed
lower when placing in drive.

 Once warmed up the idle is consistent , before it was not. In 2015 when I
swapped the 116 E unit in place of the 101 D it didn't change anything that
I could tell .

 I don't have anything to compare the way mine starts with. Jim when you
start your 73 what do you notice ?

On Mon, Sep 30, 2019 at 11:12 AM Jim Adney <jadney at vwtype3.org> wrote:

> On 30 Sep 2019 at 10:17, William Jahn wrote:
> >  I have a spare MPS 311 906 051 D that used to work fine. I decided to
> > clear out the epoxy locking the one 7 mm allen adjustment screw .
> The D should have a slotted screw adjuster, with 2 more adjustments
> beneath it. There are 3 adjustments total in that version, as well as in
> the C
> version.
> >  I did not want to screw with the E mps the 116 it is still from the
> > factory adjustment yet felt the D since it's the same exact unit as the E
> > and did work fine before all this . If one removed the numbers from the E
> > and D MPS you cannot tell one from the other.
> Those 2 should look quite a bit different. Perhaps you're talking about an
> early E, a 016, as used in '72. That would look exactly like the 116. The
> D
> has slots in the cover and looks quite different.
> >  I know adjusting the MPS is done by some in the know yet I tried it and
> so
> > far things are much better with the slight adjustment and TS1 connected.
> > 1/8th turn in not much and I didn't ruin the E116 MPS .
> If you stick to less than a half turn, and keep careful track of your
> starting
> point, you're probably okay. You're turning the adjusting screw CCW, which
> is the correct way to make it richer. 1/8 turn, or less, at a time, is the
> way to
> go.
> I'd still like to see you try different 116 MAP sensors and different 048
> brains
> to test your original parts by substitution. Changing the MAP sensor may
> cure your current symptoms, but it MIGHT just be doing so by covering up a
> problem in the brain. In other words, it might be the same as unplugging
> the
> temp sensor.
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
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