What is the reason for the serious jitter when the Wei Chai speed of the muck truck reaches the range of 1300 ~ 1500?

The normal operation of engine depends on lubrication and heat dissipation, and the trembling of automobile engine is probably caused by lack of oil or deterioration of engine oil. Let's look at other reasons for engine jitter.

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. When there is too much carbon deposit in the engine, the gasoline sprayed by the fuel injection head will be absorbed by the carbon deposit during cold start, which leads to the lean mixture during cold start and makes it difficult to start. In this case, only when the gasoline adsorbed by carbon deposits is saturated, it is easy to run into the car. After running into the car, the gasoline adsorbed on carbon deposits will be sucked into the cylinder by the vacuum suction of the engine for combustion, which will thicken the mixture and dilute the combustible mixture of the engine, resulting in idling jitter after cold start.

2. Ignition system problems, check the working conditions of spark plugs, high-voltage lines and ignition coils. If the ignition system is not working well and the spark plugs are in poor condition, it will also lead to this failure.

3. The oil pressure is unstable. If the engine carbon deposit has been cleaned, the throttle valve has been cleaned, the oil pad and spark plug have been replaced, and the car body is still vibrating at idle speed. I suggest you go to the 4S shop to check whether the oil supply pressure and intake pressure sensors are normal. If the oil supply pressure of the oil pump is abnormal, or the value of the intake pressure sensor is wrong, the car body will shake.

4. The aging of engine parts and automobile jitter are also related to the aging of engine feet. The engine foot is actually the damping system of the engine. The engine foot is responsible for absorbing slight vibration when the engine is running. If there is something wrong with the engine foot, these vibrations will be transmitted to the steering wheel and cab, causing idling jitter.