2010 BMW 135i

[RawrImAMonster]

After starting my car for the first time after getting back from vacation I got a momentary poof of black smoke. From what I've seen, this tends to suggest a leaky injector, which is likely the cause of my misfiring issues on cold starts as well.

I was hoping that my issue wasn't an injector because one thing that is a pain about direct injected motors like this one is that you need to code the injector in the car's computer. This requires a 100 dollar cable and BMW software that you can find online. Also, depending on which injectors I have in my car currently, I might have to replace a whole bank (3 injectors) because you can't mix and match certain injectors on the same bank.

So at best, this will cost me around ~200 bucks to fix myself. Injectors are about 100 bucks a piece so if I need more the cost will go up quickly.

Also, it still hasn't thrown a code so I'm not sure which one it is yet. It is getting (very) slowly worse, so hopefully it will one of these days.