Hello friends, I noticed a rattling noise coming from the area of the front lid Bank 1 or the throttle flap. Whenever the engine runs under the idle speed, this noise becomes louder, e.g. when starting up or when you open the oil cover and the speed drops for a short time. But even in idle one hears a slight polter. At higher speeds the noise disappears. I thought first, it would be the ZMS, which ratters when starting but it clearly comes out Bank 1 in front. I think it has something to do with the idle control. It sounds like ratters, surren as if something is loose. I recorded it:https://youtu.be/Vypz6VUoHtM car is 645ci from 2004 , switch, 180 tkm. Since I will soon open the valve covers, I might want to exchange the causer. What could that be? Vacuum pump , vanos, chain ? Does anyone have an idea? Greetings,Martin