What is the slight jitter when the engine is idling?

Slight jitter is normal. If the jitter is serious, it needs to be checked.

Idle jitter may be caused by the following four reasons:

1. The engine has serious carbon deposition.

The most common cause of automobile jitter is that the throttle valve is too dirty or the fuel injector has too much carbon deposit. 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 the cold start, which leads to the lean mixture during the 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 problem

Check the working conditions of spark plugs, high-voltage lines and ignition coils. Poor working conditions of ignition system and spark plug can also lead to such failures.

3. The oil pressure is unstable

If the engine carbon deposit has been cleaned, the throttle valve has been cleaned and the spark plug has been replaced, it is still found that the car body is shaking at idle speed. It is recommended 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, it will cause the body to shake.