Misfire help

[linnadawg]

Have a 2011 M3. Keep getting code 2755 ignition cyl 3 activation. Swapped coils, swapped plugs and swapped injectors with different cylinders but keep getting this code for cyl 3. Has anyone dealt with this code?

[Lozza47]

Dealing with the same issue but ignition cylinder 6 & 7 activation codes.
Car goes into limp mode.
Tried the same things.

[linnadawg]

Originally Posted by Lozza47

Dealing with the same issue but ignition cylinder 6 & 7 activation codes.
Car goes into limp mode.
Tried the same things.

Saw someone saying they had throttle actuators done and they forgot to bolt down a couple ground wires to the rear of the engine. Gonna check and see if that’s the case for the last guy.

[linnadawg]

I just solved mine. It was only cylinder 3 for a while. This morning I had all kinds of misfire codes and the entire passenger banks fuel injectors were turned off. I scoped the passenger side ignition coil control wires and they all had random voltage spikes, which usually indicates a bad ground. Removed the ignition coil cover and the ground at the rear of the valve cover was loose. If you look at a wiring diagram it’s the ground for the suppression capacitor with all of the orange wires. Even though it’s a ground for all 4 coils it gave me a cyl 3 activation code for the longest time.