During rapid deceleration in a modern gasoline direct injection (GDI) system, which outcome occurs due to wall wetting?

💡 Explanation

A fuel film accumulates on cold cylinder walls. Port Fuel injection cleanses before firing. The "wall wetting" effect then causes a transient rich air-fuel (AF) mixture to occur, because the fuel evaporates into cylinder later, rather than completely mixing. Therefore, a richer mixture occurs than anticipated.

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