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The air feed to the ecu comes from the rad, so when the aircon is running the ecu is getting very hot air, I am seriously thinking about fitting a case fan to the ecu enclosure.
Dammit-
Yes that! Also had seen folks with same problems with them. Plumb your own air feed around the rad pack and add a 12v case fan to exhaust out the side or rear of housing.
Diesel doesn't ever produce much heat so not an ossie for me.The old 7xx/9xx cars when running mods in rhd would melt the brake fluid reservoir and then catch fire. Lhd cars didn't have that problem
BrickMan
Could explain the air-con link to the stalling problems too. Air-con condensers can chuck out a fair bit of heat. Could you just rig up a small PC fan to waft cool air over the ECU? Or move it somewhere a bit cooler?