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Old 10-03-2012, 07:29 PM   #1
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Join Date: May 2012
Location: S.E Melbourne, VIC
Posts: 193
My Ride: '04 325ci 5MT
Another Cold start squeak thread

Hi Guys,

Done a search but theres not much regarding initial start up sounds.

Car recently started developing a cold start squeak. Only happens for about 1s during the initial crank and start. The sound only appears during the first second of a start.

Doesn't happen for the rest of the day either, only on the morning start.

Hard to reproduce once it happens in the morning. Even turning it off then back on straight away, the next start is squeak free.

I have attached a video, not sure if it helps. Wondering if its belts / pulleys or the tensioners. Listening to the video suggests i can hear either idle pulley or belt noise.

Not sure how many K's on the belt and tensioners. Acquired the car 5 months ago, 94k KM on the clock. '04 model.

Should i start pulling the belts off to check the idle and tensioner's bearings? Otherwise would any other component cause that squeal for a split second when it fires up?


'04 325ci M-sport 5MT
- Bone stock -
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Old 10-03-2012, 10:11 PM   #2
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Join Date: Mar 2010
Location: Dallas, TX (USA)
Posts: 2,204
My Ride: E46 330i
Send a message via Skype™ to BimmersGarage
Pull the belts and do the pulley spin test.
See my vids if you need a reference.
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Old 11-26-2012, 01:54 PM   #3
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Location: Bay Area, CA
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My Ride: has twin turbos
Bumping this as I have the same issue - OP did you get any resolution on the problem?

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Old 11-26-2012, 03:59 PM   #4
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Location: Tdot
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There are numerous threads about this and the conclusion was that change the alternator and it solves your problem...

I had the same problem with mine, but I sold my e46 recently
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Old 11-26-2012, 04:05 PM   #5
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My Ride: Estoril Blue 228i
All of it. All three pulleys.
Idle. Tensioner. Ac
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Old 11-26-2012, 06:05 PM   #6
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Join Date: May 2012
Location: S.E Melbourne, VIC
Posts: 193
My Ride: '04 325ci 5MT
Will look into the AC tensioner and belt, as they look older. Pulled the belt off and the main belt feels nice and soft and looks fairly new. The idle and tensioner pully seem to have to play and dont free spin at all, similar to videos on youtube showing a new pully.

The Alternator feels smooth to turn.

'04 325ci M-sport 5MT
- Bone stock -
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