Which outcome results when a gasoline direct injection (GDI) engine experiences fuel injector dribble at shutdown?

💡 Explanation

When GDI injectors dribble after shutdown, unburned fuel puddles on the closed intake valves, leading to carbonization as the engine cools due to fuel decomposition. Therefore carbon deposits form on the valves, rather than overheating, wear or cavitation which are influenced by different failure mechanisms, such as misfiring or pump failure.

• Which outcome occurs when a diverter valve fails closed in a combined cycle gas turbine's heat recovery steam generator?
• Which mechanical erosion accelerates when hydraulic pumps undergo pressure drops?
• Which risk increases when induced current exceeds thermal limits three-phase power autotransformer systems?
• Which defect is enabled within cast iron due to rapid cooling?
• Which operational problem results when the thermal load exceeds the evaporator capacity in an absorption chiller?
• Which consequence results when rapid valve actuation causes fluid-column separation in long hydraulic lines?