Final answer:
The engine stop procedure in a theoretical context involves ceasing fuel intake in a four-stroke engine, guided by the Otto cycle, which stops the combustion process and leads to the engine halting.
Step-by-step explanation:
The steps in an engine stop procedure can be understood through the Otto cycle, an idealized model representing the operation of a four-stroke gasoline engine. An understanding of this model helps in comprehending how an engine halts after the ignition process is discontinued.
Since the question appears to be more focused on the theoretical aspect of the stopping process as opposed to the practical sequence of actions to manually stop an engine, we will consider the final phase of the Otto cycle.
The Otto cycle includes the intake stroke, where a mixture of air and fuel is drawn into the combustion chamber, the compression stroke with an adiabatic compression of this mixture, an ignition phase at constant volume, and finally the exhaust stroke where the combustion gases are expelled, completing the cycle and returning the engine to its starting state.
In order to stop the engine, the fuel intake is ceased, and without fuel, the cycle cannot continue, effectively bringing the engine to a halt.