Which outcome occurs when fuel injectors in a diesel engine experience delayed needle closing during cutoff?

💡 Explanation

When diesel fuel injectors fail to snap shut rapidly, after-injection occurs because atomized fuel continues entering when it's not needed, leading to incomplete combustion. Therefore particulate matter increases due to inadequate air mixing during this late combustion phase, as opposed to power reduction, high temperature or improved consumption, which stem from distinct malfunctions.

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