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We've been having what might be the same issue, or might be something else..?
2016 X1 w/ 54k miles. At cold start (1st start of the day) the car starts fine and idles fine... until we shift into gear (reverse, usually). Then as we back out of the driveway the idle fluctuates badly and the car bucks, shudders, and surges. Once in awhile this occurs still when we shift into a forward gear, but most of the time it's just that brief initial time in reverse. A couple of times the car stalled on us, and a couple other times it was bucking so bad we shut it down and then re-started it... after which it runs fine.
Been doing this for about 9 months. NO ERROR CODES thrown the whole time. Way back in December I had my independent BMW specialist take a look, but with no codes and his inability to re-create the problem (of course) no action was taken.
For me, what's weird is that the idle is stable until the tranny is shifted into gear. Why would the act of shifting into gear (not even moving yet) cause the idle to start fluctuating? - I keep thinking it may be something with the transmission not the engine. But hey, I'm not a mechanic. I have not taken it to a dealer yet, but that may be the next step.
Thoughts? Is this the same "cold start rough idle" problem others are complaining about? Should I take it to the dealer and ask for the ecu update? Anything else I should look into?
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