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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 11-11-2012, 06:33 PM
Psalm11_6 Psalm11_6 is offline
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Odd squeal coming from front, increases with acceleration

98 540iA has some odd squealing sound coming from what I believe to be the front under the hood, and I'm just not sure what the heck it is at this point. I've done a bit of searching on the forum, but nothing looks to be ringing a bell or matching the symptom.

Seems to be aggravated by the cold, not as likely to happen when warm out... Definitely not the brakes, much higher pitch than that (and I checked the pads as well as their backs to be sure this wasn't the culprit.

Once the car is fully warmed up, everything seems to be fine (not just engine temp, as it takes 5-10 miles or so after temp needle reaches 12 O'Clock). Only thing I can think of at this point is either something related to the drive shaft (?) or perhaps a wheel baring (though I don't know what that would sound like).

Is there anything common that I might have missed or any possible suggestions anyone might have? Difficult to narrow the dang thing down as I have to be moving to hear it and only REALLY hear it after 15-20mph and up :-(

Hope everyone had a decent weekend!
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  #2  
Old 11-11-2012, 06:42 PM
Psalm11_6 Psalm11_6 is offline
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Something I just realized I forgot to mention: while I thought it was likely unrelated, I turned the fan up a few notches, then all the way off - no noticeable change in squealing

Please forgive any grammatical errors, sent from mobile
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  #3  
Old 11-14-2012, 02:21 PM
Psalm11_6 Psalm11_6 is offline
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Still trying to narrow this down... It's weird that it only happens in the cold. I'm getting to the point where I'm about to just replace the front brake pads anyway on the off chance this is what's doing it.

So far I only know it has to do with SOMETHING rotating as it only happens after getting under way lol
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  #4  
Old 11-14-2012, 02:36 PM
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johnstern johnstern is offline
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Could it be your serpentine or A/C belt? Perhaps one of the tensioners has worn out.
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  #5  
Old 11-14-2012, 02:47 PM
Mikes530 Mikes530 is offline
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+1 on the belts and/or tensioners as the most common cause of squealing.

Is the noise engine speed or road speed related?
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  #6  
Old 11-14-2012, 02:50 PM
Swat17 Swat17 is offline
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It may sound weird but try melting some wax onto the Serpentine Belt, or spraying some WD-40 and see if the sound goes away. if it does then it's probably your belt tensioner.
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  #7  
Old 11-14-2012, 03:32 PM
Psalm11_6 Psalm11_6 is offline
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I'll give that a shot next time I drive it. Might be the weekend as im still milking two wheels as much as I can :-D.

It appears to be relates to road speed though, not engine speed, which led me to something wheel or drive shaft.

I'll update once I have anything of note.

Thank you all for the input!

Please forgive any grammatical errors, sent from mobile
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  #8  
Old 12-07-2012, 10:26 AM
Psalm11_6 Psalm11_6 is offline
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Well, I pulled off each wheel and did a ton of lubricating on anything that looked like it needed it. Pic attached of mid-process :-)

No dice. One thing that did come to mind - I replaced the later OEM Textar pads with Jurid pads in the rear and these cover a larger part of the rotor than the Textars did. I thought perhaps the squeak was related to the wearing of the rust ring around the rotor by the new pads, but this has since worn down and the squeak persists.

Now I'm wondering if having the Textars still up front and the difference in grip is what's screwing with me. I check for free rotation up front and it seems fine. There's some tension in the rear in neutral, but this is expected. Still nothing catching that I've found.

I'm going to continue to tinker and plug away. Maybe I'll start going through the process of upgrading the braking components while I'm at it :-)
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  #9  
Old 12-07-2012, 11:17 AM
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AnotherGeezer AnotherGeezer is offline
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  #10  
Old 12-07-2012, 12:26 PM
mbell666 mbell666 is offline
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Is the sequel related to road speed, engine speed (revs) or acceleration/throttle position?

If it revs need to look at belts, pulleys etc. Acceleration I be looking a vacuum leak on the engine. Road speed i be looking at brakes and suspension, running gear etc.
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  #11  
Old 12-07-2012, 12:33 PM
Psalm11_6 Psalm11_6 is offline
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I mentioned it earlier, but it is a ways up in the thread. It seems to be road speed related only. It also goes away after 10 minutes or so of driving which I thought was weird, probably related to moving parts warming up...
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  #12  
Old 12-07-2012, 12:40 PM
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AnotherGeezer AnotherGeezer is offline
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Secondary Air Pump?
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  #13  
Old 12-07-2012, 12:44 PM
Psalm11_6 Psalm11_6 is offline
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As it seems to be directly related to road speed, I'm not sure how it could be the secondary air pump... Though I could easily be missing something. Could you clarify?
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  #14  
Old 12-07-2012, 12:53 PM
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AnotherGeezer AnotherGeezer is offline
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I'm just spitballin'

Mine gives a quick squeal in cold weather only but I have heard others say that theirs has acted similar to what you've described. I also had a wicked bad tear in my intake boots that caused a nice falsetto on acceleration. but happened all the time and was temperature independent.

How are your forward inner fender liners? If they are damaged or missing? Your pump could get gunk on it and cause it to act weird or straight up fail. When I bought my car, they were both missing and I never drove it in wet or snowy conditions until I replaced them.
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  #15  
Old 12-07-2012, 12:56 PM
Psalm11_6 Psalm11_6 is offline
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Fender liners are all in place and in good shape :-)

A good deal of the fun for this car (at least for me) is working on it. I refuse to give up till I find the problem lol

I'm actually wondering if a wheel baring could cause something like this squeak at this point... Though in my experience if a baring starts going, it's a grind and not a squeak.
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  #16  
Old 12-07-2012, 02:35 PM
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Albo Albo is offline
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Can you take video of sound?
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  #17  
Old 12-06-2015, 07:15 AM
Willy7166 Willy7166 is offline
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Psalm 11 6 . Did you ever figure this out? I have the same issue with my 2002 540 and it is driving me nuts. Thought it was a sticky caliper so I swapped that out yesterday and the 10 mile cold squeal is still there.
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  #18  
Old 12-06-2015, 10:01 AM
Willy7166 Willy7166 is offline
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Anyone else have this issue and able to solve it? Thanks!
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  #19  
Old 12-06-2015, 10:56 AM
Barracuz Barracuz is offline
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Quote:
Originally Posted by Willy7166 View Post
Anyone else have this issue and able to solve it? Thanks!

How about making a new topic instead of bumping an old one. And include deatils.
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  #20  
Old 12-06-2015, 03:37 PM
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mattmar1 mattmar1 is offline
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had a bear of a time figuring out a squeal on a friends 545, turned out to be the water pump intermittently doing it, and there was a temperature relationship. a lot of the symptoms were similar to yours, which is what initally made it difficult.
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  #21  
Old 12-06-2015, 05:45 PM
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Or it could be the pip that runs between the CCV and the OSV along the side of the intake manifold. If it's loose where the pipe goes into that short rubber hose at one end (the other end has the spring connection) and can turn freely, then it may be where the whistle / turbo noise happens.
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  #22  
Old 12-07-2015, 05:42 AM
Willy7166 Willy7166 is offline
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Thanks for the replies. It really does not sound engine related as it does not happen at all while the car is stopped and has no relation to RPM speed. It really sounds like a rotational squeal from the right side of the car. Have pulled the brakes and even replaced a sticky caliper on the front right this weekend thinking that was the culprit. Started out on this morning with temps in the low 30's and it started squealing again within a mile of the drive and did not stop until about 10 miles later and was quite as a mouse for the next 20 miles.
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  #23  
Old 12-07-2015, 06:55 AM
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gmak2012 gmak2012 is offline
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You have water pump and power steering pump that could be culprits, if you believe that it's not the belts or pulleys.
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