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Join Date: Feb 2018
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X3 306 turbo diesel making whistling noise under accerleration

Hi, my x3 makes a whistling noise on acceleration, I found an example of ccv noise and it sounds identical, except when I removed the oil cap and then drove it the noise remained. There was no vacuum on the cap when I removed it and the noise is only present on acceleration around 2 to 3 k rpm. It’s not a turbo whine it’s constant
Any ideas?
Old 02-05-2018, 01:27 AM
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Dmitry at Pelican Parts's Avatar
 
Join Date: Aug 2016
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Hello and welcome to the forum! That was going to be my first guess and one that most people have attributed to the sound, Crankcase Breather. Others have mentioned that the intake tends to whistle as well. Other members will likely chime in to help.
Old 02-05-2018, 01:04 PM
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