Want to leave this video where you can follow the behavior of the engine from the start of the Fap cleaning until it is finished. You can see the weight as when it approaches 4500, the cleaning starts. There is an attempt to load the engine, turning on electrical parts, such as heaters, mirrors, windows and making the engine work or strain.
https://drive.google.com/file/…vpQ7z5y/view?usp=drivesdk
That is why some of us in our cars install a LED connected to those loads that the car turns on, to know when it is carrying it out and we try not to interrupt it as much as possible.
This only occurs in diesel cars.