Your insights are appreciated. I'm sure I'm not the only person to
pull open their ECU and see these things. I had seen your comments in
the archives re: Bosch ECU's and sloppy (my term) solder work. Good to
get a better handle on the difference between an actual heat mark and
solder work. Those spots looked like leftover rosin to me.

I'd be interested to compare solder work of this Bosch 2.1 ECU with
the '94 ECU from my Jetta swap Vanagon (and if I still have it) my
spare 2.0 air cooled Vanagon ECU

Neil.

On Sun, Jul 8, 2012 at 11:49 AM, David Beierl <dbeierl@attglobal.net> wrote:

> At 02:32 PM 7/8/2012, neil n wrote:

> ......  The 2.1l case gives pretty good
> protection but isn't really protected against humidity as far as I can see
> -- unless that vent is really an overpressure valve.
>
>
>
>> Interesting. There were quite a few of these spots.
>
>
> Every 2.1l ECU I've opened has had some rework, I think.  Some may be from
> the production line.  The Bosch units in particular have had very
> bad-looking solder, though the 022D ones seem better.  If someone has
> repaired the unit he may have put the silicone goop on to try to help the
> interconnects.  I don't know whether it will actually help, but it will make
> them harder to resolder.

--
Neil n

65 kb image Myford Ready For Assembly  http://tinyurl.com/64sx4rp

'88 Slate Blue Westy to be named.

'81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/

Vanagon VAG Gas I4/VR Swap Google Group:

http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines