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X5 30D - Strange idle noise X5 30D - Strange idle noise
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Old 03-19-2015, 11:55 AM
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Now that's a funny noise...

I have no direct experience on this, but the EGR valve could in fact be the reason.

In the EU version the EGR is vacuum controlled. The vacuum acts on a membrane that pulls the rod controlling the poppet valve for the EGR. If the membrane has a tear it can vibrate and produce a quacking noise.
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