URO Intake Manifold Adjusting Unit (DISA Valve) - M52tu Engine

This is a quality aftermarket DISA valve for the M52tu 6-cylinder engine on E46 323Ci, 323i, 328Ci, 328i (1999, 2000), E39 528i (1999, 2000), and Z3 2.8 (1999, 2000).

This is the DISA valve located in the intake manifold of the M52TU engine in the E46 323i/325i/328i, 1999-2000 E39 528i, and Z3 2.3/2.8. DISA is "Differential Intake Air Control", also known as variable length intake runners. It's a flap system that redirects the intake air inside the manifold depending on load and RPM. At low RPM the flap is closed which helps boost low and mid-range torque. At high RPM the flap is open all the way which provides the most air volume for high RPM power. A faulty DISA valve will cause the engine to feel sluggish or unresponsive in the low-mid RPM. There is no fault code for the DISA valve itself, although several related faults and check engine lights may be traced back to it - fuel trim, misfires, lean condition, and fuel mixture. There may also be a clicking sound from the driver's side of the engine bay as the DISA solenoid tries to operate the butterfly flap. The o-ring seal on the outside of the valve body can also fail and lead to vacuum leaks.