Hi all
Is it safe to swap motronic ecu's?
I have a 535i with a manual box and i think i traced a hunting idle problem to the ecu after swapping out the air flow meter, idle stabalizer valve and temperature switch etc. I looked for a used ecu bearing the same part number but could not find one for sensible money. Then i found a 530i manual in a scrap yard and took the ecu from it and put it in my car. It seems much better with a smoother idle and no noticable loss in power etc. I'm not sure if this is safe to do in the long run. Can anyone advise?
The original ecu part no. is 0 261 200 150. The one i pinched from the scrappie is 0 261 200 178.