How to Determine if Spark Plugs Need Replacement

[OLevi]

Determining if spark plugs need replacement: 1. If abnormal engine vibration occurs during acceleration, it is likely caused by degraded spark plug performance; 2. Significant engine vibration at idle speed may also indicate spark plug issues requiring immediate inspection or replacement (though this could also result from engine mount deterioration or excessive carbon buildup in the intake ports); 3. Difficult engine starting clearly points to ignition system problems, potentially from faulty spark plugs. Standard spark plugs have a service life of 15,000 km, while long-life variants don't exceed 30,000 km. Operating at extremely high temperatures, spark plug insulator skirts normally maintain 500-600°C during engine operation. Insufficient temperature leads to carbon deposits on the insulator, while excessive temperature may cause pre-ignition and engine knocking.