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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 11-25-2012, 01:35 PM   #1
LetsEats
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Help to identify this noise

Hi, can someone help identify this noise?



It happens on occasion so I'm wondering if I could still drive it for a few days until I buy what needs to be replaced. Thanks.
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Old 11-25-2012, 01:40 PM   #2
99_323i_Steve
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pulley or tensioner in that area...i had the same noise on cold starts and replaced those parts, gone. I replaced both my tensioners and pulleys and belts while i was in there. engine bay is silent now.
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99 323i. Factory:Harmon Kardon Hi-Fi, Winter Package w/ heated sport seats, and Sport package with Sport steering wheel and Sport suspension.

Aftermarket: 16" rims, LED Angel Eyes, LED license plate lights, LED tails, LED depos, Black kidney grill, and DICE Aux jack input, 20% tint.
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Old 11-25-2012, 01:54 PM   #3
LetsEats
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Thanks. Would you say it's still driveable for like 3 days? or is that taking a risk?


Quote:
Originally Posted by 99_323i_Steve View Post
pulley or tensioner in that area...i had the same noise on cold starts and replaced those parts, gone. I replaced both my tensioners and pulleys and belts while i was in there. engine bay is silent now.
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Old 11-25-2012, 02:06 PM   #4
99_323i_Steve
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ya these are just wear items. Your pulleys have grease bearings. Once they wear out they squeal and squeak. The tensioner causes looseness in the belt which can also cause the high pitch noises. I drove mine for a week after the noise came before my parts arrived, no harm done.
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I've learned some people think their a mechanic when they can do their own oil change. Don't always believe what you read.

99 323i. Factory:Harmon Kardon Hi-Fi, Winter Package w/ heated sport seats, and Sport package with Sport steering wheel and Sport suspension.

Aftermarket: 16" rims, LED Angel Eyes, LED license plate lights, LED tails, LED depos, Black kidney grill, and DICE Aux jack input, 20% tint.
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Old 11-25-2012, 02:45 PM   #5
scim459
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If the pulleys seize the belt will snap and you loose cooling, power steering and can destroy your fan and rupture your expansion tank and a bunch of other things. Get it done ASAP so you don't get stranded somewhere.
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Old 11-25-2012, 02:48 PM   #6
WDE46
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I'm pretty sure this is the sound the alien in Independence Day makes. My head almost blew up. You may want to check your intake for the presence of extra terrestrials.

Last edited by WDE46; 11-25-2012 at 02:49 PM.
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Old 11-25-2012, 03:25 PM   #7
99_323i_Steve
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the catastrophe the guy above me explained is a little drastic but if you just started experiencing those noises you will be okay for a week or 2 until your parts come

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__________________
I've learned some people think their a mechanic when they can do their own oil change. Don't always believe what you read.

99 323i. Factory:Harmon Kardon Hi-Fi, Winter Package w/ heated sport seats, and Sport package with Sport steering wheel and Sport suspension.

Aftermarket: 16" rims, LED Angel Eyes, LED license plate lights, LED tails, LED depos, Black kidney grill, and DICE Aux jack input, 20% tint.
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Old 11-26-2012, 02:21 PM   #8
E462005
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Quote:
Originally Posted by 99_323i_Steve View Post
pulley or tensioner in that area...i had the same noise on cold starts and replaced those parts, gone. I replaced both my tensioners and pulleys and belts while i was in there. engine bay is silent now.
Do you know the exact part number part name for that my car makes the same exact noise
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Old 11-26-2012, 06:10 PM   #9
99_323i_Steve
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pulleys are here. http://www.fcpeuro.com/BMW-parts/323i/?keywords=pulley

you will most likely have to check and see if you have a mechanical tensioner or hydraulic tensioner. all the pulleys are above^^

RealOEM.com also will help you narrow down your model by VIN and tell you which parts you have...or you could get off the computer and open your hood and check for yourself haha
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I've learned some people think their a mechanic when they can do their own oil change. Don't always believe what you read.

99 323i. Factory:Harmon Kardon Hi-Fi, Winter Package w/ heated sport seats, and Sport package with Sport steering wheel and Sport suspension.

Aftermarket: 16" rims, LED Angel Eyes, LED license plate lights, LED tails, LED depos, Black kidney grill, and DICE Aux jack input, 20% tint.
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Old 11-27-2012, 12:09 PM   #10
E462005
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Quote:
Originally Posted by 99_323i_Steve View Post
pulleys are here. http://www.fcpeuro.com/BMW-parts/323i/?keywords=pulley

you will most likely have to check and see if you have a mechanical tensioner or hydraulic tensioner. all the pulleys are above^^

RealOEM.com also will help you narrow down your model by VIN and tell you which parts you have...or you could get off the computer and open your hood and check for yourself haha
Lol I got it its mechanical. Now I'm looking at parts. The pulleys come by themselves and they Also sell them with the tensioner. Should I go for the one with the tensioner? Because that's what was said that usually makes that sound
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Old 11-27-2012, 12:10 PM   #11
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wouldnt drive it! protect your e46
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Old 11-27-2012, 03:35 PM   #12
99_323i_Steve
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if you want to knock out 2 birds with 1 stone then Go for it that's what I did and now my car is absolutely silent under the hood. keep in mind that belt can also cause a loud squeal like that so maybe that as well.

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__________________
I've learned some people think their a mechanic when they can do their own oil change. Don't always believe what you read.

99 323i. Factory:Harmon Kardon Hi-Fi, Winter Package w/ heated sport seats, and Sport package with Sport steering wheel and Sport suspension.

Aftermarket: 16" rims, LED Angel Eyes, LED license plate lights, LED tails, LED depos, Black kidney grill, and DICE Aux jack input, 20% tint.
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Old 11-27-2012, 08:16 PM   #13
E462005
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Quote:
Originally Posted by 99_323i_Steve View Post
if you want to knock out 2 birds with 1 stone then Go for it that's what I did and now my car is absolutely silent under the hood. keep in mind that belt can also cause a loud squeal like that so maybe that as well.

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I asked e46mango this. If the pulleys are bad will I be able to tell just by looking at the belt while its spinning? Because the noise only happens in the morning. 4-5am then after I get off work 330pm. It's noisy for a few minutes then it stops. I looked at the belt while the car was on and it looked like it was running fine .

Last edited by E462005; 11-27-2012 at 08:18 PM.
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Old 11-27-2012, 08:48 PM   #14
99_323i_Steve
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they are grease bearings if they spin a lot than there worn out if they don't spin very much when you try to spin them their still good

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__________________
I've learned some people think their a mechanic when they can do their own oil change. Don't always believe what you read.

99 323i. Factory:Harmon Kardon Hi-Fi, Winter Package w/ heated sport seats, and Sport package with Sport steering wheel and Sport suspension.

Aftermarket: 16" rims, LED Angel Eyes, LED license plate lights, LED tails, LED depos, Black kidney grill, and DICE Aux jack input, 20% tint.
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Old 11-28-2012, 03:57 AM   #15
E462005
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Quote:
Originally Posted by 99_323i_Steve View Post
they are grease bearings if they spin a lot than there worn out if they don't spin very much when you try to spin them their still good

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Ok I will try that out before I do anything thks
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