What are the signs that spark plugs need to be replaced?

[Simoes]

There are several precursors indicating that spark plugs need replacement: difficulty starting the engine, low power output, excessive exhaust emissions, and increased fuel consumption. Difficulty starting the vehicle: When the car has trouble starting, it may be due to excessive carbon deposits on the spark plugs or the presence of other impurities, which cause the spark plug gap to widen. This results in insufficient energy during ignition, preventing the vehicle from starting normally. Low engine power: If the engine's power output is too low, it indicates excessive carbon buildup on the spark plugs. This reduces the resistance during spark distribution, affecting the spark plugs' performance and leading to decreased engine power and reduced driving force. Excessive exhaust emissions: When spark plugs malfunction, they disrupt the normal operation of the ignition system, preventing the air-fuel mixture in the engine from burning completely. This causes harmful substances to be emitted without full combustion, resulting in excessive exhaust emissions. Increased fuel consumption: Abnormal spark plug performance can cause the ignition system to malfunction, preventing fuel from burning completely. This often leads to fuel wastage and higher-than-normal fuel consumption. How to determine if spark plugs need replacement: Keep the car idling. If the engine runs smoothly, the spark plugs are functioning properly. However, if the engine exhibits intermittent or continuous shaking accompanied by abnormal "popping" sounds, it indicates a potential issue with one of the spark plugs, signaling that they need to be replaced.