What are some signs that indicate a malfunctioning fuel metering system?

A malfunctioning fuel metering system can lead to various symptoms that indicate issues within the system. One of the most noticeable signs is rough idling and increased emissions. When the fuel metering system fails to deliver the correct amount of fuel to the engine, it can cause irregular engine performance, resulting in a rough or unstable idle. This uneven operation often leads to incomplete combustion, which subsequently increases harmful emissions being released into the atmosphere.

In contrast, options relating to efficient fuel consumption, improved engine responsiveness, and enhanced vehicle acceleration point towards a well-functioning system. A properly operating fuel metering system enhances vehicle performance by ensuring the engine receives the optimal fuel-air mixture, resulting in smooth idling, efficient fuel use, and improved acceleration capabilities. Thus, the presence of rough idling and increased emissions clearly indicates a malfunctioning fuel metering system.