How Long Does It Take for Spark Plugs to Reach Optimal Performance After Replacement?

[VanNadia]

Spark plugs typically take about a week to reach their optimal performance after replacement. Below is a detailed explanation on whether spark plugs need replacement: 1. Check if the engine starts normally: Observe whether the cold start is smooth, if there is any noticeable "jerking," and if the ignition is normal. 2. Monitor engine vibration: Keep the car idling. If the engine runs smoothly, the spark plugs are functioning properly. If intermittent or continuous vibrations are detected, accompanied by abnormal "popping" sounds, it may indicate a faulty spark plug that needs replacement. 3. Inspect the electrode gap of the spark plug: If the gap is excessively wide (normal spark plug gap is 1.0-1.2mm), it can disrupt the normal discharge process, leading to engine sluggishness.