BMW X3 Rough Idle & Power Loss: Fuel Regulator Issue?

Hey there! I have some experience working on BMWs and had a similar issue with my 2014 X1 last year. My sister also owns a 3-series, so I'm quite familiar with these engines. I faced almost identical symptoms, rough idle, poor acceleration, and that annoying check engine light. Turned out my high-pressure fuel pump was failing. My trusted mechanic diagnosed it, and after replacing the pump (ouch, 1510 Euro later), the car ran like new again. The whole repair took about a day. Before jumping to conclusions though, what's your exact engine variant? Also, have you scanned for error codes? These symptoms could point to a few different issues, and knowing the specific engine and error codes would help narrow things down. The fuel pump failure is common on these engines, but let's make sure we're not missing something else. Let me know these details and I can share more specific advice from my experience.

Thanks for sharing your experience! My X3 has done 19763 KM and just had its service last month. Based on what you're describing, it really does sound similar to my situation. The symptoms match up pretty closely, especially the rough idle part. I've got the error code scanned at a local shop, it's showing P0087, which I've read is related to fuel pressure. I was hoping it wasn't the high-pressure fuel pump because I know how costly that repair can be, but from what you're saying, it's looking more and more likely. Did you notice any other warning signs before your pump completely failed? And did you try any temporary fixes before the full replacement? Really hoping to avoid that hefty repair bill if possible!

Hey again! Yeah, your situation sounds exactly like what I went through. When I saw that P0087 code on your BMW, I immediately thought "yep, same story." Just like yours, my X1 started showing these symptoms right after hitting the 20,000 KM mark, even though I had regular service. Before my pump completely failed, I noticed the symptoms would get worse after the car sat for a while, especially on cold mornings. I tried a few temporary fixes, cleaned the fuel system with a good quality cleaner and even adjusted the fuel pressure sensor, but honestly, these were just band-aids. I actually held off on the repair for about two weeks, trying to save some cash, but that was a mistake. The car started stalling more frequently, especially at traffic lights (super embarrassing), and the power loss got worse. Eventually, I just bit the bullet and got it fixed, didn't want to risk damaging other components. Here's what I learned: with these BMWs, once you see that specific code and those symptoms, it's usually the high-pressure fuel pump. I know the repair cost is painful, but waiting too long could lead to bigger issues. Trust me, I learned that the hard way! Have you noticed if the symptoms are worse when the engine's cold? That's usually a dead giveaway for the fuel pump issue.

Thanks for the detailed follow-up! You've pretty much confirmed my worst fears about the fuel pump. And yes, now that you mention it, the problems are definitely worse in the morning when the engine's cold. I've been experiencing those same embarrassing stalls at stops too. I guess I should stop putting this off and just get it fixed properly. You make a good point about potentially causing more damage, that would definitely cost more in the long run. I'll call my mechanic tomorrow and schedule the repair. Really appreciate you sharing your experience, especially the bit about temporary fixes not being worth it. Saved me from wasting time and money trying those first! Would you mind if I message you after the repair to let you know how it went? Thanks again for all your help!