Bimmerfest - BMW Forums - View Single Post - CCV time, oh and DISA too.
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Old 09-26-2010, 07:44 AM
szee1 szee1 is offline
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Location: Las Vegas
Join Date: Aug 2009
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Mein Auto: 2 2004 X3's
It appears that unplugging it should stop the noise so this may not be your problem. That said, I am not sure that unplugging it always eliminates the noise. I have read that you can also place your ear on the DISA while the engine is running and verify if noise is coming from it. From what I can gather, the failure points can either be a loose valve on the shaft or a failure in the vacuum system which creates the noise. Mine was a loose shaft and I don't recall any noise from it.

The system is basically a butterfly valve controlled by a shaft which is turned by vacuum actuator. While the actuator uses engine vacuum to move, it's actions are controlled electronically.

This is a good link to show how the valve is connected to the vacuum actuator.

DISA noise video.
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