Well, I have not gone looking for that problem, but as a casual reader of this forum, I had never come across it before.

And I know the problem descriptions are just words, but I've read those links you sent, and your descriptions in this thread, and sure, I could read those words and say that yeah my stuck IACV issue fit those descriptions.

My situation was pretty easy to recognize and then know when it was fixed because it was completely gone, and then full-on stuck all the time, and then completely gone following the re-cleaning. I guess the engine rebuild thrown in the middle did cause some doubts, but it was still pretty straightforward vs. a problem that appears gradually without an obvious trigger. I know if this problem were to come on slowly, it would be tougher to diagnose.

I still think it would be worth it to consider the IACV. It's pretty easy to remove and clean.

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2001 X5 3.0i, 203k miles, AT, owned since 2014