Which outcome occurs when a gasoline direct injection (GDI) engine experiences insufficient fuel rail pressure?

💡 Explanation

When fuel rail pressure is insufficient in a GDI engine, leaner combustion occurs because the injectors cannot deliver the correct amount of fuel, increasing NOx emissions due to higher combustion temperatures. Therefore, higher NOx emissions result, rather than pre-ignition, hydraulic lock or catalytic converter failure which require different fueling problems.

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