This is a bit of a wild guess, but if you get the three power wires out of order on the motor, it will sound terrible and not "run"... Make sure you have them in the right sequence, etc...
Second thing -- make sure the sensor wires are not damaged and that the white plug is FULLY seated into the ESC's socket.
"If you cannot win, make the one ahead of you break the record."
Biff Racing Team #420 (Ah... The "good old days"...)
The local indoor Offroad Track: The RC Race Barn
TLR22-3.0, TLR22T-2.0, TLR22SCT-1.0