Why Does the Car Move Without Pressing the Accelerator?

[AdelineLynn]

There are two main reasons why a car moves without pressing the accelerator. Manual Transmission: During the idle phase of a manual transmission car, it will move at idle speed even when neither the accelerator nor the brake is pressed. This action is generally referred to as crawling start, and no matter at what speed the brake is released during the start, the vehicle will not stall. Automatic Transmission: Since automatic transmissions do not have a clutch, once the gear is shifted into drive, the car will move even without pressing the accelerator, typically at a speed of around 15 km/h. Therefore, to move at a very slow speed, the brake must be used to reduce the speed. Generally, the larger the engine displacement, the higher the idle speed will be, but it won't be excessively high because the first gear is, after all, a low-speed gear.