I just tried a similar experiment. I have four ECUs, three from
Syncros (86, 86, 87,) and one from an 89 2wd GL. They all worked when
installed in my 88 Westy and 87 Syncro. A local had a condition where
if you tapped on his ECU, the engine died, so we tried all four of
mine and NO go. Put in a GoWesty ECU and Vrooom.........so you never
know. I guess I could think this to death and come up with a couple of
likely reasons, but the bottom line here is to let you know that your
experiment might demonstrate results that reflect instant logic and
gratification.
Miguel

I have not failed. I've just found 10,000 ways that won't work.
  - Thomas A. Edison

On Fri, Mar 12, 2010 at 5:27 PM, Raymond Paquette
<raymondpaquette@gmail.com> wrote:
> Or, more specifically:
>
> Anybody in or around Northampton MA, who has an ECU that would work in
> my 1987 Syncro?
>
> I want to test-swap-in a known working one, so I can be sure mine
> doesn't work.
>
> Raymond
>