What Causes the Engine Malfunction Indicator Light to Illuminate?

[Evelyn]

Reasons for the engine malfunction indicator light illuminating: Carbon deposit issues: Carbon deposits here include cylinder carbon deposits, throttle carbon deposits, spark plug carbon deposits, intake carbon deposits, etc. These areas are closely related to the engine's power output. When there is excessive carbon buildup inside the engine, the vehicle's ignition energy decreases, intake efficiency declines, ultimately leading to reduced engine power and symptoms like weak idling. Fuel system: Adding incompatible fuel grades, such as using 90 octane instead of 93 octane, can cause a decrease in the vehicle's output power and performance. Alternatively, if the fuel tank cap vent is blocked, or components like the fuel tank switch, fuel filter, or fuel lines between the tank and carburetor are partially obstructed, the required fuel supply cannot be met, resulting in a lean air-fuel mixture and weakened engine acceleration. Intake system: Intake air is one of the power sources for the engine. If the air filter is not cleaned regularly and becomes clogged after prolonged use, insufficient air volume will cause the combustible mixture to become too rich, leading to decreased engine power. For vehicles equipped with turbochargers, any malfunction in the turbocharging system can also result in reduced engine power or performance loss.