* Inertia. When you turn off the ignition, the engine's momentum keeps it spinning for a brief period. This is especially noticeable in larger engines, which have more inertia.
* Fuel injection. After you turn off the ignition, the fuel injectors may continue to spray fuel into the engine for a few moments. This can cause the engine to continue to run even though there is no longer any spark to ignite the fuel.
* Airflow. When you turn off the ignition, the airflow through the engine stops. This can cause the engine to stall, but if there is enough momentum and fuel, the engine may continue to run for a few seconds.
If your Peugeot 207 SW estate engine is continuing to run for more than a few seconds after you turn off the ignition, it is important to have it checked out by a mechanic. This could be a sign of a problem with the engine, fuel system, or ignition system.
