When a vehicle's spark plug malfunctions, it can still be driven temporarily in the short term, but requires careful handling based on specific conditions. Spark plugs are responsible for igniting the air-fuel mixture in the engine. If a single spark plug is damaged, it may cause the corresponding cylinder to misfire, resulting in engine vibration, power loss, sluggish acceleration, and other symptoms, which are particularly noticeable in engines with fewer than four cylinders. However, safety risks could escalate during high-speed driving or on complex road conditions, potentially triggering the malfunction indicator light. Prolonged failure to replace spark plugs will worsen the problem, potentially causing ignition system leakage, incomplete fuel combustion (increasing fuel consumption and exhaust emissions), and accelerating the aging of other electrical components. Spark plug lifespan varies by material: nickel alloy typically requires replacement every 20,000 kilometres, platinum every 40,000 kilometres, and iridium can last 60,000-80,000 kilometres, though actual replacement intervals should follow the vehicle manual. It is advisable to consult professional maintenance for inspection promptly to prevent further engine damage and ensure driving safety and performance stability.
