[T3] Two Tests

[William Jahn]

Jim I wanted to add . Today when I drove it to the store, When I started it
the idle was 500 after an hour sitting, then it came back up. While driving
home I also pushed down on the gas and let off and did this a few times
which injected more fuel and it had  better pickup which seems to  tell me
I'm running lean. I tested the TPS several times and could not find any
issues at all , no wear get all 20 clicks everything checked out fine
there. I was very consistent. Not bucking , nothing.

On Mon, Sep 16, 2019 at 3:42 PM Jim Adney <jadney at vwtype3.org> wrote:

> This afternoon I decided to get off my butt and do 2 things that I had
> been
> postponing for way too long.
>
> First, I needed to replace the voltage regulator on my ratty daily driver,
> the
> beige '73 Square. I've been getting those loud clicks from the old one
> that
> always preceeds their death. Best to change it now, before any harm is
> done. This was my chance to try one of the new Bosch electronic VRs.
>
> I havn't been too excited about these, because they have a large upper
> shell
> which is entirely at generator output voltage. Seems like an invitation to
> shorts.
>
> In the process of installing this new VR, I ran across a few other
> problems
> that I think are equally troublesome.
>
> 1) There's no provision for attaching the ground wire. There is a pair of
> extra
> screws on top that turn out to be grounded. They're not designed or
> intended
> to be used as grounds, but that's what I did.
>
> 2) The stud where we're supposed to attach the D+ wire, the generator
> output, has a hex nut on top that's larger than 9 mm and smaller than 10
> mm.
> Could it be 3/8"? I don't know, but I managed to tighten it anyway.
>
> 3) That top shell, which is at generator output (D+) voltage is too close
> to the
> inner side wall of the body. There's a piece of vinyl there on my Square,
> but
> if that cuts thru, I'll have a short. This is all made worse by the
> "flare" at the
> bottom of the shell. I will put some thin insulator there, to keep this
> from
> happening. If I were doing it over, I'd slot the mounting holes so the VR
> could slide 1/4" farther inboard, and maybe see if I could flatten the
> flare a
> bit.
>
> Once installed, it seems to regulate well, but I'll need more experience
> with it
> to know better.
>
> The second task was to go thru my stash of FI brains and test a few '73
> 048
> brains, to make sure I had some that seemed good. I think I came up with 5.
>
> I pulled out the one in the car, that had been working fine for the last 3
> years, and tried each of my others in turn. Those tests were short, but my
> original '73 still seemed to run extremely rich. So I'll set that one
> aside,
> marked as bad. Apparently there is something that can go wrong with that
> version. While testing, I noticed that this last generation has 2 boards,
> an
> upper and lower. If I'd noticed that before, I'd forgotten. I'll have to
> look at
> some earlier versions to see when that started, but I don't think the ABCD
> versions were that way.
>
> When I was finished, I reinstalled the one that has been working well for
> the
> past 3 years.
>
> BTW, for those who have been following William's quest, a D pressure
> sensor was for the Euro '72s. Everything else (brain & distributor) that I
> can
> see looks to be the same as what we got here in the US.
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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