Uneven Engine Performance in BMW 5 F10 2012 2.0d 184km N47D20C After Cold Start and Regeneration

Hello
Autko as in the topic 2.0d engine 184km engine code n47d20c turned the bushing on the 4th crank and the block broke, I put on another engine after regeneration. Now there is a problem that after starting the cold engine for about 5 seconds, it does not work evenly, then the work is leveling and everything is ok, as if the candles are not heating, but all the working voltage is initially 9v and drops to 8.7.5v at this. 4 steps outside. In the IC catalog, he writes that this candle and when powered by 7v, anyone knows the topic and will suggest something?

In the CR engine, the influence of glow plugs on the unevenness of operation at the current temperatures is negligible. Anyway, the driver detects a burned candle and records an error, so what problem to check. I would first look for the cause in the injection system.

I had the same, but in a different dci car. The injector was at fault.

I suggested to the client to check the injectors as they were taken out, but he made savings and did not agree

For me, the ripple started after replacing the valve in the Delphi injection, I don't know why. Then the injection started to hang. Once a few thousand km. I replaced the injection coil because it is possible and the needle.