What happens if spark plugs are not replaced for a long time?

[Cooper]

The effects of not replacing spark plugs for a long time include: 1. Increased fuel consumption and loss of vehicle power; 2. Difficulty in starting the car, with severe shaking occurring during startup; 3. Damage to the car's catalytic converter, leading to excessive exhaust emissions. The functions of spark plugs are: 1. To introduce the high voltage electricity generated by the ignition coil into the engine cylinder; 2. To generate sparks between the spark plug electrode gaps to ignite the air-fuel mixture, ensuring normal engine operation. The types of spark plugs include: 1. Standard spark plugs; 2. Insulator projection spark plugs; 3. Electrode spark plugs; 4. Seat-type spark plugs; 5. Pole-type spark plugs; 6. Surface gap spark plugs.