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#1
05-16-2006, 01:30 PM
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High pitched whistle when you accelerate? I found where mine was coming from.
Well that whistle was starting to drive me crazy and I set out to find it. Only took about 2 minutes. The air boot was cracked, and cracked badly. I have no idea how it could not have throw a code or made the car run rough. Anyway grabbed a new boot and slapped it in and the noise is gone. I have read a lot of others have heard this noise so I am sharing my finding.
The boot cracks on the bottom of the little tube, and is not easy to see. Its also not easy to get to the hose clamps. I had to get them with a really long extension from under the car. I hope that was not posted already, I did not see anything about it. 
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#2
05-16-2006, 01:35 PM
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Quote:
Thank you for this info. I just discovered mine this past week and it is annoying. I am going to schedule the dealer to fix it since its still under warranty.
__________________
2003 X5 & 2000 323i - I Love my Bimmers. 
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#5
05-16-2006, 02:08 PM
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3.0 and it's the air boot directly under the intake. It goes like this MAF then a plastic pipe then a plastic junction then the Air Boot (rubber). Finally into the intake manifold. The Air Boot has a small rubber tube running off the side of it to the secondary air system, that’s where I had the crack, and it was so low I did not see it right away.
Last edited by The Cleaner; 05-16-2006 at 02:18 PM.
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#6
05-16-2006, 02:18 PM
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One of these parts? (3.0i Vacuum Control from OEM parts)
 No. Description Supplement Qty From Up To Part Number Price Notes 01SUCKING JET PUMP 1 06/2005 11617503623 $46.87 +core 01SUCKING JET PUMP 111617546048 $46.87 +core 02HOSE ELBOW 111617503666$10.60 03HOSE ELBOW 1 06/200511617503624$7.92 03HOSE ELBOW 111617547586 +core 04CLAMP 111151726340 $0.62 05HOSE CLAMP21,3MM 111151726339 $0.56 Sorry about the formatting. I have a 4.4i with a slight whistling sound (no driveability issues). I'm looking for comparable parts to see if I'm having the same problem.
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#7
05-16-2006, 02:28 PM
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 Number 9, that little thing shooting off it had the cracks on almost all the folds. 65K on motor and no other sign of a problem other than that @#&*^%$# noise.
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#8
05-16-2006, 02:31 PM
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Follow your intake, the air boot will be the last connection before the throttle body.
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#9
05-16-2006, 03:26 PM
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Add this to the list of "problems solved" It's gonna come up again.
__________________
"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.” Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance……. 
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#10
05-16-2006, 06:27 PM
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 Thank you so much - this noise has been irritating me for awhile now, and I do not drive it everyday.
__________________
2001 X5 3.0i (PP/WP/AP) Traded at 213K miles RARE White on Black - Why does everyone get Tan??  First E53 with 215s on XOutpost!!  
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