Digging an old thread here if anyone's still interested to fix their momo logitech wheel:

Quote from Starion83 :

One interesting theory I did read is the EMF caused by the force feedback motor brushes arcing on the spindle interferes with the optical sensor circuit... This sort of makes sense, and matches the symptoms, as after further investigation it is only when the FF motor kicks in that the wheel loses calibration. Apparently one gentleman solved this by grounding the case of the motor and wrapping the motor case in aluminium-foil. This is my next step, should be interesting.

Yeah this gentleman was absolutely right. Successfully connecting the greyish metallic case of the motor found just left of the steering wheel bar, with any ground, solves the problem Starion83 describes. I connected mine on the pedal board connector underneath the board by unscrewing the board first (has lots of solder already there).
https://drive.google.com/open? ... d90rqoDUc_7SVpV8jRTYZ17it

Aluminum foil didn't make any difference, so I just removed it.
Also do NOT connect it on the small board that comes with the motor, even if you figure out that the black cable actually is a ground!!
Surprised that the case wasn't grounded tbh, considering logitechs never found out it might interfere with the sensor circuit. A random guy on the net found it tho... GJ Logitech...

Last edited by gdevil4, Mon, 22 Apr 2019 20:20.