What is the jitter of Lexus ux engine?

Reasons for engine jitter of Lexus ux: 1, air intake system failure: excessive dirt on throttle and air intake or blockage of air filter element, reduced cross-sectional area of idle passage, less air entering cylinder than normal, enriched mixture, and insufficient combustion of cylinder, resulting in engine jitter. 2. Fuel system failure: oil supply pressure failure. There are many reasons for the failure of oil supply pressure: the fuel filter is blocked; The fuel pump is damaged or the filter screen is blocked; The pump pressure of the fuel pump is insufficient; The spring force of the fuel pump safety valve becomes smaller; The fuel pressure regulator is damaged and so on. Abnormal fuel supply pressure causes the mixture to be too rich or too lean, which reduces the engine power performance and makes the engine shake. 3. Ignition system failure: the spark plug can introduce high-voltage electricity into the engine combustion chamber, and an electric spark is generated between the electrodes to ignite the combustible mixture. If the spark plug electrode gap is incorrect, carbon deposition or ablation occurs on the spark plug electrode, the spark plug insulator cracks, the spark plug does not flash or the spark energy is weak, resulting in poor combustion of the mixed gas, unbalanced engine power meter and engine jitter. 4. Electronic control system failure: If the sensor data collected by ECU is deviated, ignition or fuel injection will be deviated, and the engine will not work normally. The control computer is the core component to control fuel injection and ignition, and the common fault of the control unit is the damage of internal circuit or poor contact.