What are the effects of not replacing car spark plugs for a long time?

[OEdward]

Not replacing car spark plugs for a long time affects their ignition efficiency, which can lead to the combustible mixture not being ignited and burned under ideal conditions. This results in increased fuel consumption, loss of power, difficulty in starting, engine shaking, increased carbon deposits, and other issues. Furthermore, it can damage the three-way catalytic converter and cause the exhaust emissions to fail to meet standards. Over time, this can lead to engine failure requiring disassembly and repair. Methods to check the condition of spark plugs: 1. Check if the metal head at the top of the spark plug has signs of erosion or deformation; 2. Check if the ceramic insulator has yellowish-brown patches, which indicate insulator leakage; 3. Check the carbon deposits on the spark plug electrodes, as well as the edges and gaps of the electrodes.