BMW M2 Injector Issues Causing Multiple Engine Problems

Hey there! I had a very similar issue with my 2017 BMW M3 last year. I have some experience working on cars, but mostly basic maintenance stuff. My car showed almost identical symptoms, rough idle, poor performance, and that dreaded check engine light. After struggling for about a week, I took it to my trusted workshop. They diagnosed dirty injection valves, which was causing incomplete fuel combustion. The cleaning and calibration service cost me 515 Euro, but it solved all the issues completely. Before I can share more specific details about your case, could you share: How many miles/kilometers are on your M2? Have you noticed any black smoke from the exhaust? When was your last fuel system service? These details would help me understand if you're dealing with the same problem I had.

Thanks for your detailed response! My M2 has 89573 KM on the clock, and the last major service was about 4 months ago. Actually, yes, I have noticed some black smoke occasionally, especially during cold starts. It's good to hear your issue was resolved with just a cleaning service. I was worried I'd need to replace the entire injector set, which would've been way more expensive. Did the cleaning service completely solve the black smoke issue for you too? I'm hoping my fix will be as straightforward as yours.

Hey again! Yes, you're definitely describing the same symptoms I had with my M3. The black smoke during cold starts was exactly what I experienced too, it's a classic sign of dirty injectors. The cleaning service completely fixed the smoke issue for me, and I haven't seen any since then. After seeing your mileage (mine was around 83000 KM when I had the problem), I'm even more convinced it's the same issue. The 4-month service interval you mentioned is interesting because my problems started about 5 months after my regular service. The technician told me that fuel quality and driving patterns can accelerate injector fouling. Just to give you more peace of mind, after the cleaning service, my fuel consumption dropped back to normal, and the engine's been running smooth as silk. The stalling and rough idle completely disappeared too. I'd definitely recommend trying the cleaning service before considering full injector replacement. Quick tip though, since having the service done, I've been using higher quality fuel and fuel system cleaner additives every few months. Haven't had any issues for over a year now. Much cheaper than dealing with dirty injectors again! Let me know how it goes after you get it sorted. Always curious to hear if others have the same experience!

Thanks so much for all the helpful details! It's really reassuring to know you had such a positive outcome with just a cleaning service. I'll definitely book my M2 in for injector cleaning right away, sounds like it'll save me a ton compared to full replacement. That's super helpful about using better fuel and additives too, I'll make sure to follow your advice there. You've honestly taken a weight off my mind, especially since our cars had such similar mileage when the problem showed up. I was getting worried this would turn into some major expensive repair, but now I'm feeling much more optimistic. I'll definitely update you once I get it sorted, hopefully I'll have the same great results you did. Really appreciate you taking the time to share your experience in such detail!