What is the reason for the idling jitter of Volkswagen EA2 1 1 engine?

What is the reason for the idling jitter of Volkswagen EA2 1 1 engine? What is the reason for the idling jitter of Volkswagen EA2 1 1 engine? The reasons for the idling jitter of Volkswagen EA2 1 1 engine are as follows: 1, oil system failure, such as poor nozzle closure or blockage caused by excessive colloidal carbon deposition in the nozzle; 2. The engine throttle carbon deposit phenomenon is too serious; 3, engine mechanical failure, such as uneven pressure in each cylinder; 4, air intake system failure, such as air intake pipe leakage. Volkswagen EA2 1 1 engine is a new type of automobile engine owned by Volkswagen, which is newly developed based on Volkswagen's horizontal modular MQB platform. ACT active cylinder management system is added, which can close two cylinders and run only the other two cylinders under certain conditions, thus restoring the configuration of timing belt and reducing the power consumption and noise inside the engine. The reason of engine idling jitter is the change of gas force in cylinders, which leads to the imbalance of power in each cylinder, the inconsistency of horizontal component of each piston during power stroke, and the imbalance of torque of engine lateral jitter. @20 19