System If the noise from the motor is loud, Check whether the Motor Pinion near the motor is loose, whether the gear has worn out, If the motor pinion is not tightly engaged with the big gear, the remote control car will not operate normally. 4.Checking the Remaining parts After removing the remote control car shell, put the car on the bracket and lift all four wheels off the ground at the same time.Check whether the dogbone, steering rods, tire latches, hexagons and other parts are falling off or loose.