[T3] a stumper!

[William Jahn]

I went through everything on my 73 with the stock 1600 FI auto trans. I
even pulled the control unit and cleaned the plug with contact cleaner and
made certain the contacts were tight . I went one step further and sprayed
contact cleaner on a rag and wiped the control units  contacts and was
amazed how much oily like residue came off.

 I was after a lean condition , even changed the runner boots and intake
gaskets I got from Jim . I took apart the electric air bypass valve because
it was sticking . Nothing changed a thing. The only fix was adjusting the
MPS a bit richer in steps because the only way it would not run lean is if
I disconnected the IAD temp sensor and even then it was not right, just
better. All the fuel lines and vacuum lines I replaced mostly because they
needed it. I even cleaned out the IAD and runners.

 I would go with a harmonic vibration that causes a connector issue. I know
one fellow on the Samba site got this new distributor think it's the 123
so it does away with the trigger points and ign points and he said his 72
never ran better.

 William

On Sun, May 16, 2021 at 5:15 PM Keith Park <topnotch at nycap.rr.com> wrote:

> Ill check these, the distributor I rebuilt to make it "Ray worthy" when
> doing the initial tuning,
> Could still be an issue in there.
> Any thoughts about the trigger points also having an issue like this?
>
> Thanks
>
> KEith
>
> Topnotch Restorations
> topnotch at nycap.rr.com
> http://www.topnotchresto.com
> 71 Squareback  “Hothe”
> 65 Notchback  “El Baja Rojo”
> 93 RX7  “Redstur”
> 13 Subaru Outback "Blendin"
>
> -----Original Message-----
> From: type3-vwtype3.org <type3-vwtype3.org-bounces at lists.vwtype3.org> On
> Behalf Of Jim Adney
> Sent: Sunday, May 16, 2021 6:40 PM
> To: type3 at vwtype3.org
> Subject: Re: [T3] a stumper!
>
> On 16 May 2021 at 9:06, Max Welton wrote:
>
> > Maybe a harmonic that shows up in that range and is making some
> > connection unhappy?
>
> That's what I was thinking. Maybe the points bouncing? Perhaps just try a
> different set of points, or I have different points with stronger springs
> that I would only recommend for someone who wants to run at unusually high
> RPMs. You could try one of those, just to see if it changed anything. If it
> pushes the miss to a higher RPM range, then you've found your problem.
>
> And check the ground strap on the points plate, to make SURE it's working.
>
> Finally, note that the points plate has to rotate to advance the timing as
> the RPM increases. As it rotates, the points wire has to flex and this can
> cause problems if the wire inside the insulation is broken. You should also
> check to make SURE that no part of the points comes close to shorting to
> ground as the points plate rotates. (IIRC, there's a screw there that can
> be
> VERY close if the wrong (too long) screw has been installed somewhere.
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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