it should be 650 rpm's and try turning ac off than see if anything happensWhat is the average idle speed of a BMW 520i?Depending on the condition of the car it can be anywhere from 650 to 700 rpm. The higher range takes into account AC operation. Rough idling or inability to idle smoothly except in higher rpm ranges means there is something wrong with the engine (too many probable reasons).
I wish you mentioned the year of the car.
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