How to Know When to Replace Spark Plugs?

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Methods to determine if spark plugs need replacement: 1. Check if the engine can start normally - if not, the spark plugs need replacement; 2. Observe engine vibration - if the engine exhibits intermittent or continuous shaking accompanied by abnormal noises, the spark plugs require replacement; 3. Inspect the electrode gap of spark plugs - if the gap is excessively wide, replacement is needed; 4. Examine the color - if severe erosion is present with phenomena like pitting, black streaks, cracks, or melted electrodes at the tip, the spark plugs must be replaced. Vehicle spark plugs should be replaced every 20,000 kilometers or 2 years (whichever comes first). The function of spark plugs is to conduct high-voltage pulses from the ignition coil into the combustion chamber, using the electrode's spark to ignite the air-fuel mixture for combustion.