What are the symptoms of a bad Disa valve?
Symptoms of BMW DISA Valve Failure
- Poor fuel economy.
- Rattling noise coming from the engine.
- Loss of power at mid and high RPM’s.
- Lack of low-end torque.
- SES/CEL light and codes for running lean.
What does a DISA valve do on a BMW?
The DISA valve (also known as the air adjustment unit) controls the path of air through the plenum, regulating the intake manifold pressure to provide greater torque around town and more power at higher revs.
What happens when DISA valve fails?
The first things to usually that go bad on a DISA valve are the seals. As the flap closes, it relies on the seal to keep any excess air from moving through it. When this seal fails, you’ll get excess air in the engine, which ultimately results in poor fuel economy.
Can you drive with a bad Disa valve?
Registered. Yes you can drive with disa unplugged. You wont get any codes as there are no sensors on DISA. Your car will NOT run any worse with disa unplugged , unless your DISA gasket is bad and leaking air out.
Can Disa valve misfire?
If your disa’s gasket is bad, it’s possible it’s influencing the misfire.
Where is the DISA valve located?
inlet plenum chamber
The DISA valve is located in the inlet plenum chamber and controls the variable length intake manifold giving better torque at low revs by closing, keeping the intake runner long. After higher engine speeds, it opens up and makes the intake runners shorter for more horsepower.
Can a bad Disa valve cause rough idle?
DISA Failure wouldnt cause a rough idle. In fact you can take the butterfly out and the car would run fine. As long as the electronics are plugged in you should be good. The rough idle is most likely caused by the IDLE REGULATING VALVE.
How many DISA valves are there?
The DISA valve is a basically a flap in the intake manifold that opens and closes, based on engine speed, to direct air flow. There are 2 valves on the US spec 330i/xi.
Does N52 have Disa valve?
normal N52 (from 328, 325) do not have the DISA (but it can be retrofitted to basically transform them in 330 after coding).
What kind of engine does a BMW Disa valve work on?
Across its 11-year life, the valve was used in the M50, M52, and M54 engine which were predominantly used in the E36/E46 3-series, E39/E60 5-series, and a number of the X3, X5, Z3, and Z4 models. What does a DISA Valve do? The DISA valve controls the path the air moves through the intake system and into the engine.
What causes a BMW Disa valve to rattle?
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. The valve is made of plastic and has a metal pin that holds it in place.
What should I do if my Disa valve is not working?
You have two options for repair and replacement: Replace the full DISA unit: if you’re valve isn’t functioning but you aren’t getting any rattle, then you likely need to replace the whole unit. Rebuild the unit: this involves replacing the flap, seal, and pin.
What happens if the valve on a BMW breaks?
The valve is made of plastic and has a metal pin that holds it in place. If the valve or pin breaks, plastic or the metal rod can get sucked into the engine, which will totally wreck your whole engine.