More TPI questions

[Jeffrey R Muehl]

Ok, here we go...

>What is the difference between the 85 vs. 89 system.
>>
>> Too numerous to describe.  It was the first generation TPI system
>> and
>> was significantly changed for '86.  The '86 through 89 is pretty
>> consistent (some mapping and other variances to basically the same
>> system)

It was stated that the 85 -vs- 89 differences were "numerous".
Were these differences just in the ECM or were sensors, TB, etc changed?
I want to convert an 85 system to the 89 ECM.  What's involved?
If it's just a harness conversion, I'm not worried.

>Ok - lets say that I have an '87 TPI - basically stock.  Can I
>just swap out a PROM for the '89 TPI to eliminate the cold-start
>injector
>on my '87??  IOW, is there a hardware(wire harness) difference
>that would prevent this (other than the cold-start injector wiring)

Any help would be greatly appreciated!

Jeff