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.氣門和進氣口中的氣體積聚如果發動機的氣門和進氣口中積碳，碳可以吸收適量的燃料（就像水流過河岸，土壤吸收水一樣），  ECU判斷出發生了錯誤。 計算機的實際控制是在假設有100份油氣的情況下彈出的，但實際上只有90份（固碳10份）進入了氣缸，因此，即使剩余的90份混合的油氣被完全燃燒，也需要 力量無法實現。 性和抖動是不可避免的。

　　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.每個氣缸的工作條件不同同樣，多缸機的火花塞也存在上述問題。 長時間使用后，火花塞的點火間隙和時間控制將有所不同，但是ECU無法診斷出這種偏差，并且它們仍然會彼此平等地對待。 這會導致實際和理論錯誤，并且會產生一些氣缸。 功率太小會引起抖動。 發動機長時間使用后，每個氣缸套與活塞之間的間隙也可能看起來不同或較小，即有些間隙較大，有些間隙較小。 在冷啟動時，沒有良好的油潤滑，并且大間隙氣缸很容易從間隙中泄漏出一定的高溫氣體，從而降低了功率輸出。

　　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.水溫傳感器故障。 如果發燒，但是體溫表的讀數正常，會發生什么？ 水溫傳感器是當時計算機判斷發動機工況的重要依據之一。 如果引擎的溫度低至10攝氏度，但傳感器“告訴”計算機“現在溫度為20攝氏度”，那么計算機將以20攝氏度的溫度噴射，油的量當然很小， 抖動當然是自然的。  。

　　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.其他因素空氣流量計臟了，導致進氣量減少。  EGR（排氣再循環）閥處于不良工作狀態，并在怠速狀態下引入排氣； 怠速馬達控制旁通進氣口以調節進氣量。 尺寸過大，如果電壓低，工作可能就位； 油太差而無法達到相應的熱值，導致燃燒的功率輸出很小。 當冷啟動或空空等待時，上述所有四個因素都可能導致某個氣缸的不良燃燒，從而導致發動機抖動。

　　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.