7 18 Reinstall the throttle.

The original Geely Emgrand 7 18 oil and gas truck suddenly bumps during normal refueling in winter, which is caused by serious carbon deposition in the engine or unstable oil pressure in the ignition system.

1, the most common reason for car jitter is that the throttle is too dirty or the fuel injector has too much carbon deposit. When there is too much carbon deposit, the gasoline sprayed by the fuel injection head will be absorbed by a large amount of carbon deposit during cold start, which leads to too thin mixture during cold start and difficult start.

2. Check the working conditions of spark plugs, high-voltage lines and ignition coils.

3. Check the fuel supply pressure and intake pressure sensor.