[RSLyrick]

Marc Haibeck has proved that ECMs are interchangeable between different MY.

To my knowledge nobody is capable of modifying the hardware of the ECM itself to add additionnal features, sensor inputs, control outputs. You can only adjust engine parameters with custom chips. If your ECM looks stock (visually) with no weird extra wire harnesses or a different housing, this is then a standard ECM.

So you probably have a custom EEPROM chip for your specific build (engine tuning) but the base ECM hardware should be identical to all of the other ones out there.

That would mean that if you put the old 90s EEPROM into your own ECM and plug the whole thing into the old 90s car, that should allow you to test the supposed faulty ECM in the old 90s vette.

I would not advise to place your ECM with the custom Lingenfelter chip directly into the standard 90s ZR-1 without really knowing what's going on in the chip. The 90s base engine may run poorly or not at all leading you to think that the ECM is faulty but it's actually not.

Maybe your ECM is running an Haibeck chip, you can visually check and then contact him based on the part number for more info. I don't know if Marc sells chips for Lingenfelter build.

I would appreciate if members involved in tuning procedure could confirm this statement before damaging a second vette or a working ECM...this is not a standard use case that we're talking about here.