The time required to replace spark plugs typically ranges from 30 minutes to 2 hours, depending on the vehicle model design, the technician's proficiency, and the accessibility of the spark plug positions. For models with relatively simple engine compartment layouts such as the Hyundai Verna and Honda Jade, a skilled technician can complete the replacement of four-cylinder spark plugs within 30 minutes, while complex turbocharged models or German cars with compact engine compartments may take 1 to 2 hours. The material of the spark plug directly affects the replacement interval: nickel alloy spark plugs are recommended to be replaced every 20,000 to 30,000 kilometres, iridium spark plugs can last 80,000 to 120,000 kilometres, and turbocharged models require a 20% to 30% shorter interval than naturally aspirated ones. If cold start jitter, weak acceleration, or increased fuel consumption occurs, the spark plugs should be inspected and replaced immediately. First-time operators are advised to reserve 40 minutes and pay attention to cleaning the working environment to prevent dust from entering the cylinders.
