![Pilt](http://img6.imageshack.us/img6/1904/img1779cu.jpg)
![Pilt](http://img225.imageshack.us/img225/3908/img1778ar.jpg)
![Pilt](http://img833.imageshack.us/img833/3618/img1777n.jpg)
![Pilt](http://img546.imageshack.us/img546/9493/img1776bl.jpg)
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http://www.ecstuning.com/BMW-E60-525i-M ... ES2129987/Having idle problems and low RPM hesitation? Located next to the intake manifold.
Air adjustment unit controls the path of the air in the intake manifold, allowing either a shorter or longer runner length. A common source of trouble causing low RPM sluggishness and accompanied by a clicking sound from the engine bay.