Replacing old spark plugs with new ones can indeed improve a vehicle's acceleration performance, the core principle of which lies in optimizing ignition efficiency. When spark plug electrodes are worn or carbon-fouled, the reduced ignition energy leads to incomplete combustion of the air-fuel mixture, directly affecting power output. New spark plugs can provide stronger spark intensity, ensuring complete combustion of the air-fuel mixture, thereby enhancing low-speed torque performance and making the acceleration process more linear. Copper-core spark plugs require replacement approximately every 20,000 to 30,000 kilometres, while iridium spark plugs, though more expensive (around 200-400 Malaysian Ringgit per set), can last up to 100,000 kilometres and improve fuel efficiency by approximately 3-5%. Vehicle owners should select the appropriate model based on the heat range parameters specified in the manufacturer's manual, as incorrect heat ranges may cause pre-ignition or carbon buildup issues. If the vehicle exhibits hard cold starts or jerking during rapid acceleration, priority should be given to checking whether the spark plug gap falls within the standard range of 0.7-1.1mm.
