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Which outcome rapidly occurs in a diesel engine cylinder when fuel pre-injection is mistimed?

A)Increased exhaust particulate matter production
B)Enhanced fuel auto-ignition consistency rates
C)Greater engine power stroke efficiencies
D)Reduced cylinder peak pressure gradients

💡 Explanation

Increased exhaust particulate matter arises when pre-injection timing is incorrect due to incomplete combustion. This is because insufficient time exists for homogenous mixing: therefore, increased particulate matter results rather than complete combustion linked to optimal peak pressures.

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