1. The improper mixture ratio of oil and gas is not accurate, which exists in both open-loop and closed-loop control. In a closed-loop controlled car, the minimum operating temperature of the oxygen sensor is 370 ℃. If the car is just starting, the oxygen sensor will not work because the temperature in the exhaust pipe does not reach 370 ℃. At this time, the ECU judges incorrectly, and the control unit has errors in the control of fuel gas mixing and ignition timing, so as to reduce the vehicle's power output and cause jitter.

　　2.气门和进气口中的气体积聚如果发动机的气门和进气口中积碳，碳可以吸收适量的燃料（就像水流过河岸，土壤吸收水一样），  ECU判断出发生了错误。 计算机的实际控制是在假设有100份油气的情况下弹出的，但实际上只有90份（固碳10份）进入了气缸，因此，即使剩余的90份混合的油气被完全燃烧，也需要 力量无法实现。 性和抖动是不可避免的。

　　2. Gas accumulation in the valve and air inlet if carbon is accumulated in the valve and air inlet of the engine, the carbon can absorb a proper amount of fuel (like water flowing through the river bank and soil absorbing water). ECU judges that there is an error. The actual control of the computer pops up under the assumption that there are 100 parts of oil and gas, but only 90 parts (10 parts of carbon sequestration) actually enter the cylinder. Therefore, even if the remaining 90 parts of mixed oil and gas are completely burned, it needs force to not be realized. Sex and jitter are inevitable.

　　3.每个气缸的工作条件不同同样，多缸机的火花塞也存在上述问题。 长时间使用后，火花塞的点火间隙和时间控制将有所不同，但是ECU无法诊断出这种偏差，并且它们仍然会彼此平等地对待。 这会导致实际和理论错误，并且会产生一些气缸。 功率太小会引起抖动。 发动机长时间使用后，每个气缸套与活塞之间的间隙也可能看起来不同或较小，即有些间隙较大，有些间隙较小。 在冷启动时，没有良好的油润滑，并且大间隙气缸很容易从间隙中泄漏出一定的高温气体，从而降低了功率输出。

　　3. The working conditions of each cylinder are different. Similarly, the spark plug of multi cylinder machine also has the above problems. After long-term use, the spark plug's ignition gap and time control will be different, but the ECU cannot diagnose the deviation, and they will still treat each other equally. This can lead to practical and theoretical errors, as well as some cylinders. Too little power can cause jitter. After the engine is used for a long time, the clearance between each cylinder liner and piston may also look different or smaller, that is, some of the clearance is larger, some of the clearance is smaller. In cold start-up, there is no good oil lubrication, and large clearance cylinder is easy to leak a certain amount of high temperature gas from the clearance, thus reducing the power output.

　　4.水温传感器故障。 如果发烧，但是体温表的读数正常，会发生什么？ 水温传感器是当时计算机判断发动机工况的重要依据之一。 如果引擎的温度低至10摄氏度，但传感器“告诉”计算机“现在温度为20摄氏度”，那么计算机将以20摄氏度的温度喷射，油的量当然很小， 抖动当然是自然的。  。

　　4. Water temperature sensor failure. What happens if you have a fever, but the thermometer reads normal? The water temperature sensor is one of the important bases for the computer to judge the engine working condition at that time. If the temperature of the engine is as low as 10 ℃, but the sensor "tells" the computer "the temperature is now 20 ℃", then the computer will spray at a temperature of 20 ℃. Of course, the amount of oil is very small, and the jitter is natural.

　　5.其他因素空气流量计脏了，导致进气量减少。  EGR（排气再循环）阀处于不良工作状态，并在怠速状态下引入排气； 怠速马达控制旁通进气口以调节进气量。 尺寸过大，如果电压低，工作可能就位； 油太差而无法达到相应的热值，导致燃烧的功率输出很小。 当冷启动或空空等待时，上述所有四个因素都可能导致某个气缸的不良燃烧，从而导致发动机抖动。

　　5. The air flow meter is dirty due to other factors, resulting in reduced air intake. EGR (exhaust gas recirculation) valve is in a poor working state, and exhaust gas is introduced in idle state; idle motor controls bypass air inlet to regulate air intake. The size is too large, if the voltage is low, the work may be in place; the oil is too poor to reach the corresponding calorific value, resulting in a small combustion power output. When cold start or empty waiting, all four factors mentioned above may lead to poor combustion of a certain cylinder, resulting in engine jitter.