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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 10-01-2008, 02:09 PM
EyeNDaSky1 EyeNDaSky1 is offline
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Exclamation 2002 325i High Pitched Whistling Noise

I have a 2002 325i with 119K. The last couple of days I have noticed a high pitched whistling noise coming from the engine bay. It only whistles around 2000 - 3500 rpms and only lasts for about 5 mins after start. I thought it may be the wheels or brakes, but the noise is still there in Neutral. I don't usually hear it in the morning which I also found weird.

Any ideas?

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  #2  
Old 10-01-2008, 09:29 PM
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search air intake boot
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  #3  
Old 10-01-2008, 10:16 PM
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Sounds like your intake is either wtf dirty or has a little hole some where. I had this problem on a Monte Carlo SS a while back never had the problem on my BMWs though. But it did turn out to be my intake was wtf dirty.
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  #4  
Old 10-02-2008, 02:32 PM
EyeNDaSky1 EyeNDaSky1 is offline
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Ok, Great. I'll take a look at it. I replaced the belts thinking they were worn, but didn't fix the noise. Doesn't matter anyway because the belts were still original...
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  #5  
Old 10-02-2008, 02:59 PM
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Open the hood, and try to track down the general area it's coming from in the engine bay.
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  #6  
Old 10-02-2008, 06:54 PM
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henry_desmond henry_desmond is offline
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Mines started as a whistle and then it turned into a high pitch squeal.... I thought it was the belts then it turned out to be the alternator tensioner! It costed $976.88 to replace it at the BMW dealership!
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  #7  
Old 10-03-2008, 07:56 AM
EyeNDaSky1 EyeNDaSky1 is offline
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Ok, maybe high pitched whistle wasn't the correct sound terminology. Its more like a high pitched whine, that fluctuates with how high the rpms are. Seems to only do it on the drive home from work after the car has sat in the parking garage. It was about 50 degrees this morning and didn't do it.

It will only last for about 5 mins on the drive home and then goes away till the next end of work day.
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  #8  
Old 10-06-2008, 09:36 AM
EyeNDaSky1 EyeNDaSky1 is offline
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Update:

Took apart air intake, cleaned and looked for cracks. Everything seems fine. Also hooked up my OBD reader and no codes were present.

Still making the noise...
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  #9  
Old 10-06-2008, 10:23 AM
ChrisLLK ChrisLLK is offline
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Could be the belt idler pulley or the alternator? If the bearings are just starting to go in one of those, it's possible when the vehicle is cold they are making noise at a certain RPM, and when they warm up, the little bit of lubricant they have starts working and the whine goes away.
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  #10  
Old 10-06-2008, 10:35 AM
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Quote:
Originally Posted by EyeNDaSky1 View Post
Update:

Took apart air intake, cleaned and looked for cracks. Everything seems fine. Also hooked up my OBD reader and no codes were present.

Still making the noise...
search my name and look for the post on the noise mine was making and see it is close
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  #11  
Old 10-07-2008, 02:33 PM
EyeNDaSky1 EyeNDaSky1 is offline
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Quote:
Originally Posted by troubled View Post
search my name and look for the post on the noise mine was making and see it is close
troubled: the brake booster issue? I think its a diff sound than the one you described. Plus applying brakes or not applying brakes has does not affect the sound being present or not.

After opening the hood and having a friend press the gas pedal (in neutral) I have traced the sound to be coming from the area of the alternator....
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  #12  
Old 10-07-2008, 04:30 PM
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you aren't going far enough up the air intake BOOT chain.................it's the last rubber elbow before it hits the manifold. That's the part that splits and causes the whiney noise.
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  #13  
Old 10-07-2008, 05:35 PM
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Quote:
Originally Posted by henry_desmond View Post
Mines started as a whistle and then it turned into a high pitch squeal.... I thought it was the belts then it turned out to be the alternator tensioner! It costed $976.88 to replace it at the BMW dealership!
You got raped.
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  #14  
Old 10-08-2008, 04:35 AM
sierrakilo99 sierrakilo99 is offline
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Check the crankcase ventilation system. These components deteriorate due to heat and can crack, causing the 'whistling' noise you hear. The ventilation valve (item 1 in the diagram) isn't expensive to replace, but its a b&*ch to get out.
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  #15  
Old 10-08-2008, 08:33 AM
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Quote:
Originally Posted by EyeNDaSky1 View Post
troubled: the brake booster issue? I think its a diff sound than the one you described. Plus applying brakes or not applying brakes has does not affect the sound being present or not.

After opening the hood and having a friend press the gas pedal (in neutral) I have traced the sound to be coming from the area of the alternator....
mine was not a broke booster problem I have attached a link to my thread here see if this sounds anything like yours

http://www.bimmerfest.com/forums/sho...910&highlight=
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  #16  
Old 10-10-2008, 10:43 AM
EyeNDaSky1 EyeNDaSky1 is offline
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Wow, yeah that's the exact sound. I haven't heard the noise in a couple days, but if it comes back I'll be sure to do what you did. Thanks.
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  #17  
Old 10-10-2008, 11:21 AM
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Quote:
Originally Posted by EyeNDaSky1 View Post
Wow, yeah that's the exact sound. I haven't heard the noise in a couple days, but if it comes back I'll be sure to do what you did. Thanks.
My problem was the deflection pulley, but I replaced both the adjusting pulleys at the same time. This is really an easy DIY, if you want to do this yourself PM me and I can help you out.
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Last edited by troubled; 10-10-2008 at 11:22 AM. Reason: wrong wording
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  #18  
Old 10-10-2008, 02:39 PM
mogness mogness is offline
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Oddly enough, I seem to be having the same issue. Started yesterday night after I drove through a flooded road, although it doesn't seem to be as loud as the one in the video. Did yours start out softer, troubled?
It really freaked me out this morning but I found that it becomes less noticable after I drive for a while.
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  #19  
Old 10-10-2008, 02:45 PM
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Quote:
Originally Posted by mogness View Post
Oddly enough, I seem to be having the same issue. Started yesterday night after I drove through a flooded road, although it doesn't seem to be as loud as the one in the video. Did yours start out softer, troubled?
It really freaked me out this morning but I found that it becomes less noticable after I drive for a while.
No mine just started that loud. I only ran the car long enough to get the video for posting and then went I got the parts. There was no warning at all.
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  #20  
Old 10-10-2008, 02:52 PM
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Quote:
Originally Posted by troubled View Post
This is really an easy DIY, if you want to do this yourself PM me and I can help you out.
Does that include 200 miles in duplicate trips because you were given the wrong parts? Was that "easy"? :
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  #21  
Old 01-20-2011, 12:42 PM
ericgarr ericgarr is offline
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I've been having the same problem. Whistling stops when I put in the clutch or let off the gas. Air intake would make sense. It's been too cold to look at it lately.
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  #22  
Old 08-13-2011, 12:37 PM
tazthecat tazthecat is offline
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Loud noise in the engine bay

Quote:
Originally Posted by troubled View Post
My problem was the deflection pulley, but I replaced both the adjusting pulleys at the same time. This is really an easy DIY, if you want to do this yourself PM me and I can help you out.

The temp was around 92 degrees, I wasnt parked in the shade and my car was off for around 3 hours. Once I was done, around the same temp outside, I went to my car started it up and I was hearing this loud whistling/scretching noise. It sounded the same as the noise you pointed out on your video. This is the first time I heard the noise, do you think I should wait to hear it again before I start taking anything a part. Another note, you said that what you did was an easy DIY. Mind giving me some more detail on what you did? I would much appreciate the reply!

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2004 325i/108k miles
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