BMW 6 Series Misfires: Common Causes and Solutions

Hey there! I have some experience working on cars as a hobby mechanic. I dealt with very similar symptoms on my 2013 BMW 5 Series last year. Turned out to be a faulty fuel injector that was causing misfires and rough running, really similar to what you're describing. After taking it to my regular workshop, they diagnosed the issue through proper testing and had to replace one of the injectors. The whole thing cost me around 515 Euro, but it completely solved the problems, no more misfires or jerky acceleration. Could you share more details about when exactly these symptoms occur? Like, is it worse when the engine is cold or hot? Also, have you scanned for any error codes? This would help confirm if we're dealing with the same issue. From what you're describing though, I'd definitely get those injectors checked out. It sounds nearly identical to what I experienced with my 5 series.

I'm dealing with the exact same symptoms on my 6er (111417 KM). The misfiring tends to happen more when the engine is cold, especially during the first 10 minutes of driving. Already got the error codes scanned at my last service, got P0301 and P0303, pointing to cylinder misfires. Really appreciate sharing your experience with the injector issue. That actually makes a lot of sense given my symptoms. Might be worth checking my injectors too, since the price you mentioned is way better than having to replace bigger components.

Hey again! Yeah, those error codes (P0301 and P0303) are exactly what I saw on my 5 Series too. When you mentioned the cold start issues, it really clicked, that's precisely how mine acted up. The first 10 minutes were always the worst, right? Such a pain! Just to add to my previous post about the injector fix, I forgot to mention that my issues started around 108000 KM, pretty close to where you're at now. After getting the injector replaced, it's been running smooth as butter for the past 15 months. Haven't had a single misfire since. Quick tip from my experience, while they're in there replacing the injector, it might be worth having them check the spark plugs too. I ended up getting mine done at the same time since they were getting a bit worn. Figured might as well since they were already working in that area, you know? Let me know how it goes if you decide to get it checked out. Always good to compare notes on these BMWs. They're great cars but can be a bit finicky with these kinds of issues sometimes.

Thanks so much for all the detailed info! I feel much better knowing someone else went through the same thing and got it sorted. I've actually just booked my car in for next week to get those injectors checked. You're absolutely right about the spark plugs too, might as well get them done while they're at it. They haven't been changed in about 40,000 KM anyway, so it's probably good timing. Really appreciate you mentioning the cold start symptoms matching up, makes me pretty confident we're dealing with the same issue here. The price you mentioned for the injector replacement honestly seems quite reasonable too, especially compared to what I was worrying it might cost. I'll definitely update the thread once I get it sorted. Thanks again for sharing your experience, it's been super helpful in figuring this out!