BMW M2 Cold Start Issues: Fix Costs & Experiences

Hey there! I faced almost identical issues with my 2019 BMW M4 last winter. The symptoms you're describing are eerily similar to what I experienced, rough cold starts, multiple cranking attempts, and excessive fuel consumption during warm-up. Took it to my garage and they diagnosed faulty fuel injectors. One injector was completely clogged and another was leaking. The diagnosis showed irregular spray patterns and incorrect fuel delivery timing. This isn't something you want to ignore, bad injectors can lead to more serious engine damage if left unchecked. The fix required replacing two injectors and cleaning the others. Was off the road for two days while they did the work. In my case, it completely resolved the starting issues and returned the fuel consumption to normal. It's definitely worth getting this checked out by a qualified BMW specialist. The injector system is pretty complex on these engines, and proper diagnosis is crucial. This isn't really a DIY job due to the precise calibration needed after replacement. Hope this helps with your decision.

Thanks for sharing your experience! That really helps, it does sound exactly like what I'm dealing with. Would you mind telling me how much you ended up paying for the injector replacement and cleaning? Also, curious if you've had any other issues pop up since the repair? I want to make sure I budget properly and know what to expect. Cheers!

Hey again! Happy to update you! Actually, I just got my M4 back from the shop last week. The mechanic confirmed it was indeed the cold start injector causing all those headaches. Total bill came to 515 € for replacing the faulty injector, and I've got to say, it was worth every penny! The car's running like a dream now. No more of that annoying rough start in the morning or having to crank it multiple times. Fuel consumption is back to normal too, which is a relief for my wallet! Been driving it daily since the fix, and honestly, it feels just like when I first got it. Haven't had any other issues pop up since the repair. My mechanic did a thorough job checking everything while they had it apart, so I'm pretty confident we caught the problem before it could cause any bigger issues. They also gave everything a good clean while they were in there, which probably helped. If you're still hesitating, I'd say just go for it. These symptoms really don't get better on their own, and you don't want to risk damaging other parts of the engine. Let me know how it goes if you get it fixed!

Thanks a lot for the detailed follow-up! I actually bit the bullet and took my M2 to a new mechanic yesterday. What a difference compared to my last experience! They diagnosed the same issue, faulty cold start injector, and fixed it right away. Cost me about 490 € all in, which seems pretty fair based on what you paid. The mechanic was super thorough and even showed me the old injector, it was pretty gunked up! Car's running amazing now. Started right up this morning without any fuss, and the engine feels so much smoother during warm-up. Fuel gauge isn't dropping like a stone anymore either. Really glad I didn't put this off any longer. You were right about catching it early, the mechanic mentioned it could've led to some nasty carbon buildup if left unchecked. Thanks again for sharing your experience, it really helped me make the right call. Guess I've found my new go-to mechanic too!