When a vehicle experiences spark plug misfire, although it can still be driven temporarily, it is strongly recommended to have it inspected and replaced promptly. As the core component for igniting the air-fuel mixture in the cylinder, a faulty spark plug may cause engine vibration, power loss, and increased fuel consumption. Particularly during high-speed operation or uphill driving, it could potentially lead to safety hazards such as sudden engine stall. Technically, single-cylinder misfire disrupts engine balance, and unburned fuel may contaminate the three-way catalytic converter, ultimately resulting in substantially higher repair costs over time. Replacement intervals vary by spark plug material: standard nickel alloy plugs should be replaced every 20,000 kilometres, while platinum and iridium variants can last 40,000 kilometres and 60,000-80,000 kilometres, respectively. Always consult the vehicle manual for specific guidance. Owners should seek immediate inspection at an authorised service centre if symptoms like rough idling, sluggish acceleration, or an illuminated warning light occur. Additionally, regular maintenance involving combustion chamber carbon deposit inspection via borescope can prevent premature spark plug failure.
