Need to check the spark plug

1. Difficulty in starting: Excessive carbon deposits and excessive wear will lead to insufficient ignition energy and difficulty in starting.

2. Low idle speed: The carbon deposit on the spark plug is too thick, the shunt resistance is reduced, and the spark generated by the electrode is affected, resulting in unstable engine operation and reduced power.

3. Increased fuel consumption: There is a problem with the spark plug, the ignition system is abnormal, and the mixture is not fully burned, resulting in a waste of fuel.

4. Excessive exhaust gas: Incomplete combustion of the mixture causes some harmful substances to be emitted without being fully burned.