'87 5kCSQ ECU question

[Swann, Benjamin R. (BSWANN)]

Shef,

I recently received a MAC-10 from an '86 5kcstq that I had upgraded with a
MAC-11 converted to QLCC.  I didn't even realize that it was a MAC 10 'til
later.

Aparrently they work pretty much the same.  I'm sure there are some
differences, but I would expect it to work in your car.

Ben

[Hi Gang,

Quick question. My '87 5kCSQ uses a MAC11C ECU, and years ago when I
installed my "Charlie Spring" I jumpered the fuelpump relay to overcome
the 1.5 bar fuelpump cutoff. This worked fine, but now without the
jumper the fuelpump will not work. I obviously "toasted" something in
the ECU as replacing the FPR did nothing to help this problem. I have
an opportunity to get a MAC10?, but I do not know if it will work in my
vehicle 100% or at all, or will I lose certain functions that the MAC11
addressed. My understanding is that the MAC11A, B and C's etc. were
interchangable...just some different coding on the main chip, but that
using something other than a MAC11 would cause the loss of other
functions/features of the car. An and all enlightening would be
appreciated.

TIA,

Shef]