Intake Manifold Adjusting Unit (DISA Valve), Genuine BMW - E46 323i/328i/528i, Z3 2.3/2.8

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.

This is a new Genuine BMW DISA valve for the E46, E39, and Z3 and comes with a two year warranty.

BMW Fitments:

3 Series
E46 (99-05) > 323Ci
E46 (99-05) > 323i
E46 (99-05) > 328Ci
E46 (99-05) > 328i
5 Series
E39 (97-03) > 528i
Z Series
E36/7 / E36/8 Z3 (96-02) > Z3 2.5
E36/7 / E36/8 Z3 (96-02) > Z3 2.8