Idle after washing the throttle.

If the engine sometimes shuts down at idle speed, and it is normal after restarting, we call it "intermittent idle flameout". This kind of fault is difficult to check for many reasons, and all kinds of parts or lines are not completely damaged. What's more troublesome is that the engine can return to normal even if it is turned off occasionally and then restarted. Therefore, even if the engine is turned off at idle due to the sensor, the engine electronic control unit will think that this phenomenon is not a fault and will not be recorded by the engine electronic control unit, so it is impossible to obtain information about the fault from the fault diagnosis system of the engine electronic control unit. The reasons for "intermittent idle flameout" are generally: the engine idle motor is stuck; The wire sheath of idle motor is somewhat worn; Idle air hole is too dirty; There is something wrong with the engine throttle position sensor; There is a problem with the camshaft position sensor or crankshaft position sensor; Engine speed sensor is faulty or too dirty; There is something wrong with the idling control program of the engine electronic control unit, and so on. In addition, if there is a problem with the quality of gasoline, it will also cause this failure.