Originally Posted by robinasu

Sorry for this obvious question: are all the connectors on the fuel rail back on correctly? I guess you would see a code for this? I would think if fuel pressure is out of control you would see a lot of funny stuff going on. Do you have ISTA? I would get that or find somebody close by with it - very helpful.

Did you use a torque wrench on the injector?



Did any of the injectors you took out have additional shims? Some do and you have to put them back in. Did you personally see the injector come out? BMW's TIS talks about it:

"Important!
Only for vehicles with a production date between 27/01/2012 and 05/10/2012:
Several cylinder heads were installed with an additional injector shim underneath the injector.
If during disassembly an injector shim (2) was removed in addition to a copper gasket (1), it is imperative that it is reinstalled.
If the injector shim is not installed or two injector shims are installed, a malfunction of the engine may occur (e.g. irregular engine running, exhaust fumes).

Important!
If the injector spacer shim is lost, the entire cylinder head has to be replaced!"

and..

"Important!
Several cylinder heads were installed with an additional injector shim underneath the injector.
Before installing the injector it is imperative that the depth of the injector shaft is measured using a depth gauge.
The depth of the injector shaft is 126.25 mm.
Ensure that an injector shim is installed if one is needed.
If the injector shim is not installed or two injector shims are installed, a malfunction of the engine may occur (e.g. irregular engine running, exhaust fumes)."

If you lost a shim maybe you can have a replacement made. You can check your build date with a BMW VIN decoder. I'm sorry if I'm throwing you off course but I see you have a 2012.