The DISA valve controls the path the air moves through the intake system and into the engine. The valve uses a flap which opens and closes to either shorten or lengthen the path the air takes to get to the cylinder chamber. At low RPM’s, the valve is closed, forcing the air to take the longer path to the cylinders.
The most tell-tale sign of a bad valve is a loud rattling noise coming from the intake system. As the seals on the valve wear down, air can slip past the valve in open and closed positions, causing a loud rattle. By this point, you will also start to notice bad performance, lack of power, etc.
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Adjusting Unit Intake Manifold DISA Valve for BMW E60 E61 E70 E83 X5 Z4 X3 Right OEM Part NumberBMW 11617560538 BMW 11617522928 Application GuidesBMW 2008-2012 128i 2007-2011 328i Convertible 2007-2011 328i Coupe 2007-2011 328i Sedan 2012 328i Convertible 2012 328i Coupe 2009-2012 328i xDrive Coupe 2009-2011 328i xDrive Sedan 2007-2008 328xi Coupe 2007-2008 328xi Sedan 2006 330i 2006 330xi 2011 528i 2006-2007 530i 2006-2007 530xi 2007-2010 X3 2011-2012 X3 xDrive28i 2007-2008 X5 3.0si 2009-2010 X5 xDrive30i 2006-2008 Z4 Coupe 3.0si 2006-2008 Z4 Roadster 3.0si 2009-2011 Z4 sDrive30i