1 1 bmw318 idling instability and cylinder loss after washing the throttle.

After cleaning the throttle valve, BMW 3 18 has the problems of unstable idle speed and lack of cylinder, which may be caused by one of the following reasons:

1. air flowmeter failure: if the air flowmeter is not removed when cleaning the throttle, it may damage the air flowmeter, resulting in unstable supply of mixed gas, which in turn leads to insufficient cylinders and unstable idle speed.

2. Malfunction of throttle position sensor: During the cleaning process, the throttle position sensor may be disturbed, resulting in incorrect sensor reading, which in turn leads to engine slipping and unstable idle speed.

3. Air filter pollution: When cleaning the throttle, it is recommended to check whether the air filter needs to be replaced. If the air filter is too dirty or blocked, it will lead to insufficient supply of mixed gas.

4. Other faults: If all the above problems are eliminated, there may be other faults that cause the engine to work unsteadily. It is suggested that a professional auto mechanic should be asked to carry out maintenance and testing in order to eliminate faults and maintain.