The engine ecu uses a closed-loop feedback control to control the ignition system, and finally achieves the best ignition timing through small steps of correction. Therefore, how long it takes for the new spark plug to run in depends on the difference between the old and new spark plugs. If the old spark plugs are covered with carbon deposits and the electrodes are severely deformed, it will take three or four days for the ecu to correct the program to the best after replacing the new spark plugs.
Nowadays, the engines of automobiles adopt a high degree of electronic control to improve the combustion efficiency of gasoline and reduce emission pollution, and at the same time reduce the probability of engine failure. The reason why the engine electronic control can replace the ancient mechanical distributor is because the electronic control system has high precision and self-adaptive ability, that is to say, after the spark plug is replaced, it is not necessary to re-write the ECU program and let it correct itself.
Under normal circumstances, ordinary spark plugs will gradually fail to maintain normal ignition function when they are used for about 80,000 kilometers, and will frequently suffer from a lack of fire after more than 100,000 kilometers. Therefore, the spark plugs should be checked every time during major maintenance. In addition to the simple visual inspection, the obd system can also be used to read the data stream of the engine, and the data can be used to judge whether the spark plugs are working normally or need to be replaced. In fact, this is also a major benefit brought by the high degree of electronic control of the engine. Through the data flow, the working condition of the engine can be judged and whether any components are not working properly.
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