BMW X1 2016 problems with misfiring for some time now

Bmw e81 120i 170ps 2007. Misfiring cylinder 4 Spark plugs, flush and injectors all new and original Bmw. I don't know what to do anymore, car runs out of round, loss of power and speed fluctuations Very bad when cold You can still feel it when warm I hope someone can help me Thank you very much

(Translated from German)

Since you've already replaced the spark plugs and injectors, the next step would be to check the ignition coil for cylinder 4. If the ignition coil is functioning properly, the issue could be related to the wiring or the engine control unit (ECU). Given the symptoms you've described, especially the fact that it's worse when the engine is cold, it might also be worth checking the coolant temperature sensor. A faulty sensor could be sending incorrect information to the ECU, causing the engine to run poorly. Remember, if you're not comfortable doing these checks yourself, it's always a good idea to have a professional mechanic look at it. Please keep us updated on your progress.

Hello, I drive a 116i built in 2014, the ignition coils + plugs were replaced by the company ngkund 2 years ago and now every few months I have the problem that I have to replace the ignition coils every few months, only one always fails! Now to my question: what could be the reason for my increasing ignition coil problems?

(Translated from German)

Frequent ignition coil failure could be due to several reasons. One common cause is voltage overload, which can occur if the spark plugs are worn out or the spark plug gap is incorrect. Even though you replaced the spark plugs 2 years ago, it might be worth checking their condition and the gap. Another possible cause could be heat and vibration, which can damage the insulation and cause a coil to fail. Make sure the coils are properly seated and the engine isn't running hotter than it should. Lastly, it could be due to a problem with the ECU or the wiring to the coil. If the ECU is sending too much current to the coil or if there's a short in the wiring, it could cause the coil to fail prematurely. Given the recurring nature of the problem, I would recommend having a professional mechanic inspect your vehicle to pinpoint the exact cause. Please keep us updated on your progress.

Thank you, it did turn out to be the ignition coil that had failed.

What exactly could the spark plugs be?

(Translated from German)

Spark plugs are a crucial part of your vehicle's ignition system. They generate a spark of electricity that ignites the fuel-air mixture in the combustion chamber of your engine. This ignition starts the engine and keeps it running. If a spark plug is faulty or worn out, it can cause several issues such as engine misfires, rough idling, poor fuel economy, difficulty starting the car, and reduced engine power. If you suspect an issue with your spark plugs, it's best to inspect them or have them inspected by a professional. They might need to be cleaned or replaced. Please keep us updated on your progress.