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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Idler Pulley.... ?



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      04-23-2013, 09:21 PM   #1
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Idler Pulley.... ?

I have a woooing sound coming from my front end above 1500rpm, and the dealer is telling me it is probably an idler pulley of some sort and that they will have to replace to tensioner as well. I don't have a quote yet because the car doesn't go in for a week. That's just what they told me when I was in the service bay letting them hear the sound. Based upon that sketchy information, has anyone else had any similar experience? If so, what was the problem and how much did it cost? I want to make sure I am well informed going into this so that I don't get ripped.

The car is a 2007 328xi with 60k.
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      04-23-2013, 09:24 PM   #2
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Not sure about the idler pulley but im replacing my tensioner and belt tomorrow and I bought all the parts for $100 from europarts.com and my mechanic is installing that and a driveshaft seal for $80
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      04-23-2013, 09:28 PM   #3
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Funny I just had those replaced on my 07 328xi, apparently its easy to do yourself.
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      04-23-2013, 09:46 PM   #4
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I have a sound also when i accelerate, sounds like a air leak. I just bought the parts (tensioner/with new bolt & idler pulley + belt) from autohausaz.com and will DIY. Parts were $113 shipped.

I'm pretty sure its one of the pulleys since the sound only occur during acceleration and it does sound like a bad baring.
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      04-23-2013, 09:47 PM   #5
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Quote:
Originally Posted by ssmith96 View Post
Funny I just had those replaced on my 07 328xi, apparently its easy to do yourself.
I think the pulley that is on its way out is the one on the very top. I will have to take a picture tomorrow when it is light out.
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      04-23-2013, 09:47 PM   #6
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its on the top right, its the smaller on all the way on the right under the big pulley
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      04-23-2013, 10:01 PM   #7
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Originally Posted by ssmith96 View Post
its on the top right, its the smaller on all the way on the right under the big pulley
Yes, I am pretty sure that is it. Do you have a DIY on how to fix this?
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      04-23-2013, 10:04 PM   #8
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Originally Posted by ska325xi View Post
I have a sound also when i accelerate, sounds like a air leak. I just bought the parts (tensioner/with new bolt & idler pulley + belt) from autohausaz.com and will DIY. Parts were $113 shipped.

I'm pretty sure its one of the pulleys since the sound only occur during acceleration and it does sound like a bad baring.
And it only happens above 1500rpm, right?
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      04-23-2013, 10:13 PM   #9
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Quote:
Originally Posted by Tim603 View Post
Not sure about the idler pulley but im replacing my tensioner and belt tomorrow and I bought all the parts for $100 from europarts.com and my mechanic is installing that and a driveshaft seal for $80
By driveshaft seal you mean flex disc?
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      04-23-2013, 10:14 PM   #10
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Quote:
Originally Posted by kd8ksn View Post
Yes, I am pretty sure that is it. Do you have a DIY on how to fix this?
Search! Haha here you go!

http://www.e90post.com/forums/showthread.php?t=627158

DIY for all the stuff you need for an N52, E90post is a beautiful thing
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      04-23-2013, 10:19 PM   #11
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Quote:
Originally Posted by ssmith96 View Post
Search! Haha here you go!

http://www.e90post.com/forums/showthread.php?t=627158

DIY for all the stuff you need for an N52, E90post is a beautiful thing
Thanks for searching for me! lol

From the picture provided it appears that the tensioner and pulley are the only things wrong with mine. I think the idler pulley is fine. I was under the impression that the idler pulley was the pulley at the tensioner.

I don't think my idler pulley is the problem, just the tensioner and tension pulley. Sounds like I need to replace those.

The dealer left me with the impression that it wasn't an easy fix. Look like a super easy DIY.

Last edited by WOT Bimmer; 04-23-2013 at 10:26 PM.
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      04-23-2013, 10:33 PM   #12
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you want to replace everything since you're at it....the other one will eventually go bad

yea, its around 1500 and it gets louder as rpm increase...1500 to 3200 rpm is where the sound kicks in
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      04-24-2013, 09:22 AM   #13
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Thank you all for the help! I was really concerned that this was going to be a wallet breaker (and rightly so if I took it to the dealer). It's nice to know so much of this stuff is a simple DIY.

N52 DIY FTW!
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      05-12-2013, 02:43 PM   #14
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May not hurt to get a new tensioner bolt while you're at it. Mine broke, and the tensioner came out off alignment.
Bought new Tensioner assy. and deflection pulley, few hundred from BMW.
Easy (30 minute) DIY
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      05-12-2013, 02:57 PM   #15
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Quote:
Originally Posted by monkey_wrench View Post
May not hurt to get a new tensioner bolt while you're at it. Mine broke, and the tensioner came out off alignment.
Bought new Tensioner assy. and deflection pulley, few hundred from BMW.
Easy (30 minute) DIY
I actually got my tensioner and bolt from autohausaz for about $75. Turned out the tensioner was okay and it was actually my oil filter that was making the sound.
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