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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-11-2012, 10:48 PM   #1
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Join Date: Apr 2011
Location: Spring Valley, CA
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My Ride: 2005 BMW 330Ci
E46 Idle Whistle... Can't find the problem :(

I've changed :

Water pump
Idler Pully
Tensioner Pulley
Spark Plugs
All belts

I still have the sound. I really don't know what it is. It goes away when i apply throttle.

It whistles only when idle. It's really annoying and very embarrassing driving a BMW sounding like this at a drive thru.

Please someone help me out :

Video of the sound:

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Old 09-11-2012, 10:57 PM   #2
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Possibly a torn air boot, also you might want to clean your throttle body along with your IAC valve. There could be just enough carbon build up to cause a whistle.
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Old 09-11-2012, 11:00 PM   #3
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what air boot are we talking about here? Is there a DIY on any of these?
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Old 09-11-2012, 11:28 PM   #4
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The rubber portion that runs from the air box to the throttle body. Two sections. I think I'm having a whistle under acceleration, so i'll be changing mine out next round of DIYs.

You just need to undo some hose clamps more or less. If you look up clean ICV DIY you can see the process.
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Old 09-12-2012, 12:18 AM   #5
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See first link below in my signature.
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 09-12-2012, 12:19 AM   #6
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AA Stg2+ 325xiA? Are you stupid? Maybe a little.
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Old 10-04-2012, 03:30 PM   #7
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i cleaned the icv and the throttle body... it doesnt make sense... my boots aren't torn either..
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