I have some problems with rough idle on my 2014 Stelvio NTX, it rides well but it's pretty annoying, especially at slow speeds
I did already:
- valve adjustment (no improvements)
- throttle body sync (it didn't fixed the issue but big improvements over 4k RPM)
- replacing the spark plugs and caps, also minor maintenance work like cleaning air ducts and airbox
- lambda sensors check
I tried to test which cylinder it's not working well, to isolate the problem, so I tested removing spark plugs connectors then injector connectors, one by one, while the engine is idle, and I had a big surprise: with only one cylinder working the idle is smooth, but as soon as I connect the other cylinder the idle goes lumpy, with RPM variation and tending to stall
From similar topics I red that changing the map could solve the issue. I bought the bike with this problem, thinking it's an easy fix, so I can't tell if it's the factory map or it was altered before. Could someone please point me to where may I download a better map for this ECU, or could someone share a working map?
Also, I would highly appreciate if someone had this issue before and could recommend a fix