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X5 E53 (1999 - 2006)
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Old 02-06-2012, 11:41 AM
chrisgsxt19 chrisgsxt19 is offline
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Location: Martinsburg, WV
Join Date: Feb 2012
Posts: 3
Mein Auto: 07 x5 4.8 04 330i ZHP
Weird! Whistling/horn noise from accelerator

I have an 02 X5, I've noticed that when I push the accelerator in about 10-20% is makes a whistling or horn like noise??? once the accelerator is beyond the 10-20% the sound goes away. It also does it with cruise control on. Any ideas?
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Old 02-07-2012, 08:08 PM
larrylava larrylava is offline
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Location: Minnesota
Join Date: Jan 2012
Posts: 1
Mein Auto: 00' 323i, 94' 325i
It sounds like your intake rubber boot is leaking. Those boots get brittle with time and start to crack and at low r's make a whistling sound. You may want to check your boot.
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Old 05-02-2013, 05:43 PM
Spring20 Spring20 is offline
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Location: New jersey
Join Date: Apr 2013
Posts: 81
Mein Auto: 2006 BMW X5
I had the same prob. It wasnt my intake boot. It was the d.i.s.a unit. It is a black box on top more towards the drivers side. Had mine replaced and no more whistling noise. It's very annoying,right?? I could hear mine on the highway even
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