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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 Mon, Aug-13-2018, 02:01:16 AM   #1
thomn8r
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Default Loud whistle on startup

My E46 M3 started making this loud whistle when I start it. It's been in the high 90's, low 100's, and it will even do it if I've been driving and shut the car off for a few minutes. I did some googling and found similar threads and youtube vides, but mine seems different. I just did all the pulleys and water pump last year.

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Old Mon, Aug-13-2018, 02:02:49 AM   #2
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Default Re: Loud whistle on startup

Almost forgot: 2003, within a day or so of 130k miles

Alternator has never been replaced (that I know of)
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Old Mon, Aug-13-2018, 02:09:19 AM   #3
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Default Re: Loud whistle on startup

Alternator or tensioner/pulley




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Old Mon, Aug-13-2018, 06:45:42 AM   #4
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Default Re: Loud whistle on startup

Idler pulley. Right in between the alternator.
Funny because this happened right after I installed my race pulleys too. It's common.
Go purchase an INA brand idler pulley. It's 15 bucks on fcpeuro right now. I'm gonna pull the trigger to do the same.
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Discussing Loud whistle on startup 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)