It is important to note that adaptive cruise control is designed to relieve the burden on the driver, not take full control of the vehicle! 2. The engine is the source of power that makes the car move. It is usually called an internal-combustion engine because gasoline is burned inside the engine cylinders, or combustion chambers. This is contrast to external-combustion engine (such as steam engine), where the combustion takes place outside the engine. The burning of gasoline in the engine cylinders produces the power. The power is then carried from the engine through the power train to the car wheels so that the wheels turn and the car move.