These symptoms on the body indicate that it is time to replace the spark plug

There is obvious frustration when the car starts:
The normal vehicle starting process is very smooth, but if the spark plug fails, the ignition process will become very difficult, and the vehicle will have obvious jitter and jerk when starting. If your car has a noticeable jerk when starting, and the car has been hissing but can't ignite, it may be a problem with the spark plug.
The engine shakes during driving:
The vehicle will not shake significantly during normal driving, except for the three-cylinder engine at idle speed. If the vehicle has an unknown jitter during driving, and the cause of engine carbon deposition is ruled out, it may be the spark plug problem.
If the spark plug has serious carbon deposition, it will make the power of the vehicle stronger and weaker. The feedback to the body is that the body keeps shaking during the driving process.
Sudden increase in vehicle fuel consumption:
The spark plug is not only related to the ignition of the vehicle, but also affects the fuel adequacy. If the spark plug fails, the gasoline will not be fully burned, and the power performance of the vehicle will not only decline, but also increase the fuel consumption of the vehicle.
In the process of using the car, if you find that the fuel consumption of your car has increased inexplicably, you can check the spark plug if you go to check and find no reason. If there is a problem with the spark plug, it should be replaced in time, otherwise it will affect the three-way catalytic converter in the exhaust pipe, causing the exhaust emissions to be substandard.