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.

  • Alternative_Leader91OPBEnglish
    1·
    1 year ago

    None taken - you would be correct at this point I’m in way over my head. My dad has been assisting the entire time and he is extremely mechanically inclined, also at a loss. I figured I’d do the sparks and coils here that way if something did go wrong I’d have someone much better suited to help. Never in a million years did I think a simple plug and coil job would turn into this.

    I feel that we’ve done everything to potentially diagnose the issue aside from physically testing the cylinder 2 injector. From what I’ve read though, n55 injectors theoretically last 200k miles. I just find it extremely bizarre to all of a sudden shit out as a do the plugs, if an injector is the culprit.

    That’s where we’re at with it. Going to likely load it on a trailer and take it to a shop for them to deal with it and hopefully not break my bank.

    Thanks for taking the time to reply.