Which malfunction occurs in a gasoline direct injection (GDI) engine when the fuel injector nozzle is excessively coked?

💡 Explanation

When a GDI fuel injector nozzle is coked, the flow is restricted because carbon deposits build up, impeding fuel delivery, causing a localized lean air-fuel mixture. Therefore a lean mixture results, rather than increased compression, pre-ignition, or elevated EGR, each of which require diverse engine failure mechanisms.

• Which undesired outcome results when ice accumulates unevenly across evaporator coils?
• Which mechanism causes pressure oscillation ('water hammer') in long hydraulic pipeline controlled by a fast-closing valve?
• Which effect occurs in hydraulic actuator control loop when position feedback signal is corrupted by noise?
• Which outcome occurs when excessively worn diverter contacts in a high-voltage tap-changing transformer cause sustained arcing?
• Which outcome occurs when a pulsed laser induces rapid thermal expansion in a microelectronic bond?
• Inside a refrigeration evaporator, which outcome arises due to excessive superheat?