so i had a pretty bad crash last week, clipped a tree branch coming around a corner low and fast and the quad just went into the ground hard. snapped two props and bent one of the motor shafts pretty bad on M3. the other three motors looked fine so i just replaced the one bad one.

ordered the exact same motor, same kv rating, same brand even - and now the thing just doesnt feel right in the air. like it's overcorrecting constantly and i can feel it in the sticks even without looking at the blackbox data. ran autotune again and it helped a little but still not quite right. anyone dealt with this? wondering if one of the other motors got damaged internally from the impact even though the shaft looks straight and it spins freely by hand.

also checked all the ESC connections and they look solid. running 4in1 so its not like i can just swap one ESC easy but the current draw looked normal on the last flight log. honestly just frustrated because it was flying so well before

yeah i'd bet money one of the other motors has a partially shorted winding. you can have a motor that spins fine by hand and still be messed up internally. stick a multimeter on the phase wires and check resistance between all three pairs - should be within like 0.1 ohms of each other. if one phase is reading significantly different you've got a damaged winding. had this exact situation on my 5 inch after a concrete kiss and the motor looked totally fine visually, spun smooth, but the resistance was way off on one pair.

also worth checking if the frame itself got tweaked. even slight frame flex can mess with motor alignment enough to cause weird oscillations that no amount of tuning will fix properly.

did you check the motor screws are all tight on the new one? sounds dumb but i once had similar weirdness and one screw was just slightly loose and it was causing micro vibrations that made the gyro go crazy. also what props are you running, if they got even slightly bent in the crash and you're reusing them that could do it too