The crescent moon rides unsteadily.

The causes of unstable riding in crescent moon include serious carbon deposition in engine, dirty throttle or carbon deposition in injector, failure of spark plug, high-voltage line and ignition coil, unstable oil pressure and blocked oil circuit.

1, the engine has serious carbon deposition and is blocked.

2. The throttle valve is dirty or the fuel injector is carbon-deposited, causing blockage.

3. Spark plugs, high-voltage lines and ignition coils fail, resulting in poor ignition system.

4. The oil pressure is unstable, the oil supply pressure of the oil pump is insufficient or the value of the intake pressure sensor is wrong.

5. The oil circuit is blocked, resulting in insufficient oil supply and unstable idle speed of the car.

6. The engine parts are aging, and the idle speed of the car is unstable.