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← TechnologyWhich outcome occurs when a diesel engine's Electronic Control Unit (ECU) injects excessive fuel during cold startup?
A)Piston ring washing and oil dilution✓
B)Increased volumetric efficiency and power
C)Catalytic converter overheating and damage
D)Reduced particulate matter emissions overall
💡 Explanation
Piston ring washing happens because excess fuel dilutes the oil film lubricating the cylinder walls. Therefore, increased blow-by and possible engine damage occur, rather than improved engine performance, because the unburnt fuel bypasses the rings weakening lubrication.
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