40,000 km of BMW 3 Series needs throttle cleaning and maintenance.

Mainly for electronic throttle cars, see if the engine idle speed is stable, and do it if the idle speed is unstable.

1. Many cars with electronic throttles use the throttle to open a small angle to provide air intake at idle speed, which is provided by a small gap between the valve plate and the pipeline. This dirty position will certainly affect the idle speed (the throttle of the vehicle with cable throttle usually has a separate idle air passage, and the dirty valve plate or valve body of the throttle will not affect the idle speed).

2. It really needs cleaning, but it doesn't need cleaning-the only place that needs cleaning is the gap between the valve plate edge and the pipeline, and the cleaning frequency should be shortened if the main city is driving at a low speed.

3. Cleaning is simple. Buy a bottle of cleaning agent, remove the intake pipe and clean it. If the throttle doesn't want to be removed, it can be ignited after surface cleaning, and the throttle can be kept, and the throttle diaphragm can be directly cleaned by spraying cleaning agent. If you haven't done it before, you should clean the throttle. Stable idle speed and pleasant driving.