'20 GEM e4 Intermittent Acceleration

2020 e4, I am experiencing intermittent acceleration. GEM is fully charged, both traction and Aux and no fault codes. The user states that when driving normally, he heard a loud “pop” somewhere he couldn’t say where it came from. Since that moment the car started stuttering forward and the car got progressively and haltingly slow. When in Forward and Reverse, the intermittent acceleration is present. I replaced the Acceleration Pedal w a new part and even used a pedal from another GEM and the problem still persists exactly the same. So the pedal is ruled out. When I say intermittent, when pressing down on the pedal suddenly ‘all at once’, the car will not move, however, if I ‘baby’ the pedal pressure like slowly and haltingly the car does move (both F and R separately) but still sporadic and not smooth acceleration, and sometimes not at all. So I was thinking it sounds like more of a mechanical nature like a Relay contacts failing or wiring or switch vs some component with containing software (VCM/Controller).

Has anyone come across this issue and found a solution? Can anyone recommend any possibilities on how to troubleshoot this issue?

Thank you.

I would try motor encoder as it’s a low cost part. Easy to swap.

Inwo, that is a good idea. I just came across a thread you had last summer with clubcmc regarding a similar problem. I suppose there is no way to test the encoder to see if it is malfunctioning as it operates under the ‘Hall effect’ which needs to monitor something rotating/moving…or is there something I can test before just part replacement and hope (…and change. :wink: )?

It’s much more than that. Like the distributor in a gas car. It controls

Nothing but old cars up there eh?

Similar issue with a ford think. The cart was bucking when accelerating. I drained the gear box (transfer case)oil and saw brass colored shavings. First tried disconnecting the speed sensor and that lit up the cluster but no difference in performance. Still bucking on acceleration. Thinking the bucking could have caused the gear box failure. Replaced the solenoid but with a used one so can’t eliminate that a bad solenoid was causing the bucking. Any of this sound similar or offer a possible solution for a gem?