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Discussion Starter · #1 ·
I have a 2015 Smart 451 ED. I have a simple question regarding a "Thumping noise" I hear only when on power or regen. It seems Torque sensitive not speed related. Not motor mounts, not CV axles and I have replaced the motor too due to it sounding like a bad bearing or rotor rubbing the stator... The noise is still there and only makes noise like a card in bike spokes when the power guage is off zero. It is a sound that is faster than one wheel rotation I also changed the gear oil and saw absolutely no metal particles. Can the VFD Drive unit make a thumping noise? Maybe something came loose inside?
 
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