carNo fault code is detected, but it still jitters. What is the reason?

After the car has no fault code or replaced parts, it will still shake.For a long time, it has not cleaned the entire oil circuit, which will lead topistonCarbon deposits become thicker,

Into the rowValveThickening of carbon deposits on the top,tankToo much internal impurities and moisture cause abnormal combustion of the mixture. At the beginning, there will be no obvious feeling, a little bit will find that the jitter is getting bigger and bigger.

As the combustion space changes after carbon deposits in the combustion chamber and the compression ratio increases, it will cause premature deflagration after normal gasoline enters, that is, the cylinder bursts, causing vibration and shaking, which cannot be detected by any computer.

According to actual use experience, it is necessary to clean the carbon deposit and the oil circuit.

If the oil pressure is insufficient, the computer can detect if the cylinder is missing, ifSpark plugThere is a fault, if the injector is faulty, the computer can also detect it. If there is a problem with the three-way catalyst, it can also be detected.ifsensorIf there is a problem, it can still be detected. So, your problem is not an attachment problem, but a carbon deposition problem, which cannot be detected. At this time, because you have completed all the tests, what remains is the cause of carbon deposits, which cannot be detected by the computer. Using one or two bottles of Siyoupu fuel additives can solve the problem of carbon deposits.