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← TechnologyWhich outcome occurs when gasoline direct injection exposes fuel to excessive cylinder heat before ignition?
A)Injector nozzle carbon deposit formation✓
B)Methane increase from fuel cracking
C)Piston ring wear from soot loading
D)Exhaust valve burning from rich mixture
💡 Explanation
When fuel is exposed to excessive heat, pyrolysis occurs due to localized hot spots, leading to polymerization of fuel molecules that deposit as carbon fouling the injector. Therefore, injector nozzle carbon deposit formation results, rather than increased methane, ring wear, or exhaust valve burning which depend on other conditions.
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