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← TechnologyDuring rapid deceleration in a modern gasoline direct injection (GDI) system, which outcome occurs due to wall wetting?
A)Transient rich air-fuel mixture.✓
B)Lean limit misfire condition.
C)Increased catalytic converter efficiency.
D)Decreased particulate matter formation.
💡 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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