motronic 4.3 to 4.4 swap, potential to damage ECU!!

[RyanT5]

Hi, a girl in my area contacted me about a couple of things on her 97 850 GLT. I have a stock motronic 4.4 ecu from a 98 s70 t5 at my house and was wondering if I would be able to replace her m4.3 with my m4.4
I wasn't sure if this could cause any problems or if it would only benefit her, im not a huge ecu guy and don't want to cause any issues with her car. If you have any insight please let me know. Thanks!
Ryan

[northernlights]

There is an overall compatibility issue between the 4.3 and the 4.4 due to a difference in the wiring harness design, even though the connection is identical. I believe interchanging one for the other will cook the climate control brain, although I don't recall if it is 4.3 to 4.4 which does it, or vice-versa.

There is good information from ARD about converting, but it requires reprogramming.

http://www.ardtuning.com/M44-Conversion-Informational-Page_p_18.html

[RyanT5]

Thank you! Ill check out your link, im glad i didnt just assume it was ok and do it already