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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Oct-10-2010, 10:57:43 PM   #11
M302_IMOLA
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Originally Posted by FLBMWM3 View Post
I would lean towards the alternator or possibly the tensioners.
Yeah I was thinking that it could possibly be the tensioner pulleys. Drove the car today and didn't hear the whistling noise possibly because it was warm (85 deg.).

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Originally Posted by E46er4Life View Post
To me it sounds like it may be secondary air pump. Maybe a vid would help.
What does the secondary air pump do? I will try to get a video of the noise the problem is that it happens at random times and I'm not sure a camera can capture the noise.
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Old Mon, Oct-11-2010, 12:04:41 AM   #12
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For me, it was the top idler pulley. If you pull the belt off and spin the pullies, you will know which one is the problem. I simply relubed mine (repacked the bearings) and all was well. Pop the hood and listen around the pullies.
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Old Mon, Oct-11-2010, 05:03:25 AM   #13
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My car will make one banshee whistle/shriek as soon as I fire it up in the morning. Then I hear the whistling if I rev the car up and take my foot off the gas. When the revs drop down it whistles for a second and then goes away. Any thoughts?
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Old Mon, Oct-11-2010, 07:48:49 AM   #14
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I changed my belts and the sounds went away.
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Old Mon, Oct-11-2010, 02:12:46 PM   #15
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Most likely is the belt. Since I got a S/C the belt whistle when it's cold. Once you drive it for a minute or so it will go away. The belt is cold and maybe worn. You should change the belt and see what happens since is a cheap way to correct it.
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Old Mon, Oct-11-2010, 05:36:52 PM   #16
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Originally Posted by flow350 View Post
For me, it was the top idler pulley. If you pull the belt off and spin the pullies, you will know which one is the problem. I simply relubed mine (repacked the bearings) and all was well. Pop the hood and listen around the pullies.
So you didn't have to replace the pulley, just repacked and lubed and were good to go? Thanks for sharing, I will look into this.

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My car will make one banshee whistle/shriek as soon as I fire it up in the morning. Then I hear the whistling if I rev the car up and take my foot off the gas. When the revs drop down it whistles for a second and then goes away. Any thoughts?
Same thing my car is doing. Seems to be worse on cooler mornings.

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I changed my belts and the sounds went away.
Thanks, seems like the logical place to start.

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Originally Posted by agent M View Post
Most likely is the belt. Since I got a S/C the belt whistle when it's cold. Once you drive it for a minute or so it will go away. The belt is cold and maybe worn. You should change the belt and see what happens since is a cheap way to correct it.
true!
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Old Mon, Oct-11-2010, 07:02:10 PM   #17
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My car was doing this as well, I took the belt off and spun the idler pulley and tensioner pulley and both felt like old skateboard wheels. I took them off, pryed off the bearing seals and repacked them with some good wheel bearing grease (they were bone dry). It stopped the noise for me, but if nothing else 5 bucks for some bearing grease and an hour of time is cheap insurance to know the the bearings are not dryed out and going to seize up on you when you least expect it.
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Old Mon, Oct-11-2010, 09:25:52 PM   #18
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Originally Posted by 02m3silver/red View Post
My car was doing this as well, I took the belt off and spun the idler pulley and tensioner pulley and both felt like old skateboard wheels. I took them off, pryed off the bearing seals and repacked them with some good wheel bearing grease (they were bone dry). It stopped the noise for me, but if nothing else 5 bucks for some bearing grease and an hour of time is cheap insurance to know the the bearings are not dryed out and going to seize up on you when you least expect it.
Thanks for sharing. Got to get the M over to my buddies garage to investigage.
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Old Tue, Oct-12-2010, 12:24:58 AM   #19
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I would just buy a new one. They are only about $30.
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Old Tue, Oct-12-2010, 02:42:16 AM   #20
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This is exactly what mine does. Only when cold in the am or if it hasn't been started for a few days. It lasts just 20-30 seconds then stops. I have had the car at the dealership no one has commented on it. I've had VANOS replaced under warranty. No warning lights or codes. It's been doing it for probably 3 years. I wonder if it's of any significance?




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Originally Posted by Black107 View Post
My car will make one banshee whistle/shriek as soon as I fire it up in the morning. Then I hear the whistling if I rev the car up and take my foot off the gas. When the revs drop down it whistles for a second and then goes away. Any thoughts?
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Discussing Whistling sound upon cold start up in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)