I need help. I did a complete spark plug and coil swap on my 2016 m235. Sitting at about 103k miles. This was done in prevent and the car ran perfect prior.

Now, I am having a misfire on cylinder 2 and the idle is atrocious. I have swapped coils, the misfire doesn’t follow. I swapped the new plugs back to old, same cyl 2 code and the idle is even worse.

I truly have no clue what to do at this point and don’t really understand how the car is now running like a bag of shit after it being perfect this morning.

Edit:: I’m now getting multiple misfire codes after putting all old coils and plugs back in. I’m at a total loss.

Please help me figure this out.

  • Ok-Pilot-9808@alien.topBEnglish
    1·
    10 months ago

    I had a similar issue on my 2016 328i out of nowhere, just multiple misfires out of nowhere…got new spark plugs+coil packs…it ended up being my injectors had them replaced and coded…then I also replaced the purge canister valve but idk If that affected it… also I got new spark plugs after

    • Alternative_Leader91@alien.topOPBEnglish
      1·
      10 months ago

      I’m hoping it’s something relatively simple such as the injector. Hopefully can post an update today as it’s at a shop. Did you replace all or just one? What did that run you if you don’t mind sharing?

      • Ok-Pilot-9808@alien.topBEnglish
        1·
        10 months ago

        Well, it depends on the part cost check [FCP Euro], but I paid $150 to replace the injectors+coding, I believe I paid more for the parts than the labor… also I had put new spark plugs b4 replacing injectors they were fouled do to the faulty injectors.

        So if it happens to be the injectors and you still get some misfires after replacing them, you might want to get new spark plugs.