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Which outcome occurs when fuel injector 'dribble' compromises stoichiometry?

A)Pre-ignition increases cylinder pressure
B)Thermal runaway in catalytic converter
C)Detonation erodes the piston crown
D)Volumetric engine efficiency increases

💡 Explanation

Detonation erodes the piston under high temperature, because uneven jets cause local, uncontrolled auto-ignition rather than controlled combustion: the *knock sensor* actuates timing retard. Therefore, power drops and erosion worsens, rather than efficient work, until injection improves.

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