VV5 body shake before and after cold start.

1. The most common cause of serious engine carbon deposition leading to vehicle jitter is that the throttle valve is too dirty or the fuel injector has too much carbon deposition. Solution: clean the oil circuit, check whether there is carbon deposit in the idle motor, and clean it. 2. Ignition system problems Check the working conditions of spark plugs, high-voltage wires and ignition coils. The ignition system is not easy to use, and the spark plug is not easy to use, which will also lead to this.