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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 11-15-2012, 11:59 AM   #1
sakumaxp
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Question belt squeal maybe...?

well the weather has been getting colder these past few days and right when i start my car you immediately hear a squeal, for lets say 1.5-2 seconds, enough time for me to turn off my music and listen. ive read a few posts quick last night before my drive home from work, some were saying it could be a bad tensioner, glazed pulley, or just the belt rubber is cold and after its warm shouldnt be a problem, so i drove lets say, 2 miles down the road to fill up on gas and i turned my car on after, and it was gone. i assume the squeal has to do with the cold belt? if anyone has had this problem or knows what could be wrong please throw me some info.
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Old 11-15-2012, 12:02 PM   #2
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I had a squeal in the engine bay but mine was the opposite: she didnt make noise when cold - noisy only after she was warmed up. I replaced belts and tensioner and no more noise.
Who knows though... if I were to guess I'd say that it's probably the belt tensioner or one of the pulleys acting up.
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Old 11-15-2012, 12:03 PM   #3
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I had a squeal in the engine bay but mine was the opposite: she didnt make noise when cold - noisy only after she was warmed up. I replaced belts and tensioner and no more noise.
Who knows though... if I were to guess I'd say that it's probably the belt tensioner or one of the pulleys acting up.
yeah i had my belts changed not too long ago, maybe about a week ago or so. and it only started yesterday, so ill see whats up when i start her up to go out later.
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Old 11-15-2012, 09:11 PM   #4
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What kind of belt did you get? It really could be a pulley. Try this to make sure it's not something else: get in car and roll down windows and turn off music, then turn to ignition 2 without cranking it over and make sure it doesn't make any funny noises.
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Old 11-15-2012, 09:21 PM   #5
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Mine was the pulley. theres two which normally go out the one by the alternator and one by a/c. you can put a long screwdriver close to it when cold and listen thru the screwdriver. r
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Old 11-15-2012, 09:59 PM   #6
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Did you inspect the pulleys when you changed the belt
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Old 11-16-2012, 02:00 AM   #7
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Is there any negative affect to this? Or is it just the noise? How much dose it cost to fix?
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Old 11-16-2012, 01:38 PM   #8
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Did you inspect the pulleys when you changed the belt
i live in an apartment complex and when i moved i sold most of my tools, to work on my car since before i had a garage. so now i just take it to the shop unless im doing brakes and and an oil change.
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Old 11-16-2012, 02:49 PM   #9
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It's the idler pulley.
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Old 11-16-2012, 04:02 PM   #10
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Is there any negative affect to this? Or is it just the noise? How much dose it cost to fix?
If it's a pulley and it fails, yes. A belt can come loose wrecking fan blades and such, causing a lot more damage than replacing a belt and a few pulleys.
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Old 11-26-2012, 01:29 AM   #11
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So when I turn on my car In the morning until it warms up there is a squeal from the belt area. What do I need to check to see what the problem is? And what I need to buy? I was told by a friend to put some armor all on the belt to see of that helps. What do you guys think. Please helpppp!
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Old 11-26-2012, 01:42 AM   #12
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So when I turn on my car In the morning until it warms up there is a squeal from the belt area. What do I need to check to see what the problem is? And what I need to buy? I was told by a friend to put some armor all on the belt to see of that helps. What do you guys think. Please helpppp!
It's the tensioner.
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Old 11-26-2012, 02:03 AM   #13
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Had the same symptoms on my 323ci for two weeks. Replaced the belt, tenioner pulley, and idler pulley for less than $100. Both the tensioner pulley's bearing and the idler pulley's bearing were shot to hell. I replaced the belt for good measure. All is well now
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Old 11-26-2012, 02:04 AM   #14
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Had the same symptoms on my 323ci for two weeks. Replaced the belt, tenioner pulley, and idler pulley for less than $100. Both the tensioner pulley's bearing and the idler pulley's bearing were shot to hell. I replaced the belt for good measure. All is well now
Do exactly that!
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Old 11-26-2012, 02:14 AM   #15
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Do exactly that!
Why thank you

OP, its also an easy job to DIY so don't hesitate and just get to it!
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Old 11-29-2012, 09:00 AM   #16
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Yh I've had that. I had a small VC gasket leak and it ruined the pulleys and the belt. Replaced them all and it went away. It used to be there only when cold just like yours. It's not an expensive job if you do it yourself.
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