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X3 E83 (2004 - 2010)
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  #1  
Old 02-27-2011, 07:59 PM
ajbmw311 ajbmw311 is offline
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squealing engine noise at idle

I've veen having an issue with my 2006 X3 3.0 for about 3 weeks now, where the engine makes this high-pitch squealing noise at idle. It sounds like it could be something belts related but when I get real close it almost sounds like it's coming from the valvetrain area.

check out these







Anybody had anything like this happen before? I changed the oil today and checked the air filter and looked around some more but I still can't figure it out.

Any clues any one?

Thanks,

AJ
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  #2  
Old 02-27-2011, 08:58 PM
Supercourse Supercourse is online now
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You could try squirting some water on the belts from a drink bottle to see if that has any effect - to rule out a simple belt replacement.

More likely a worn pulley and/or tensioner. Most likely the alternator/waterpump/PS one as it is higher up than the A/C one - for the noise to appear to be coming from the top end.

Normally diagnosed with a stethoscope.

Internal (expensive) noises tend to be ticking, chirping and knocking rather than squeals.
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  #3  
Old 02-28-2011, 07:52 AM
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timfitz63 timfitz63 is offline
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Quote:
Originally Posted by Supercourse View Post
... More likely a worn pulley and/or tensioner...
Concur.
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  #4  
Old 02-28-2011, 07:56 AM
UncleJ UncleJ is offline
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+2, sounds like a tensioner to me. A squirt of WD40 in the tensioner bearing might tell you if that is the culprit.
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  #5  
Old 02-28-2011, 07:20 PM
geekminer geekminer is offline
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I had same issue. Got a cheap stehescope and found it to be a belt tensioner. Changed both belts and faulty pulley. Figure about a c note if you DIY.
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  #6  
Old 04-14-2011, 09:27 AM
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jman103099 jman103099 is offline
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I believe I have the same issue... anyone know what the dealer will charge? Is it something that would be covered under my CPO waranty?
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  #7  
Old 04-24-2011, 01:21 PM
RaphaelNeal RaphaelNeal is offline
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Me too....

I just noticed a noise today....I am currently in CT and gonna be taking My 06' X3; just got to 70000 miles, in on Friday to have BMW take a look. This is the first real problem I have had and am kinda nervous. I have an 01 Passat that had the same issue, within a couple of days of discovering that sound the timing belt broke, and 5,000 dollars later....she was fixed... but yeah you should get that looked at. I hope its just my tensioner also... Which I suspect it is...
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  #8  
Old 09-11-2012, 08:22 PM
Jonesy16 Jonesy16 is offline
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Did you ever figure out what your problem was? My (new to me) X3 is experiencing the exact same noise!
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  #9  
Old 09-12-2012, 04:29 AM
timarnold timarnold is offline
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Quote:
Originally Posted by RaphaelNeal View Post
I just noticed a noise today....I am currently in CT and gonna be taking My 06' X3; just got to 70000 miles, in on Friday to have BMW take a look. This is the first real problem I have had and am kinda nervous. I have an 01 Passat that had the same issue, within a couple of days of discovering that sound the timing belt broke, and 5,000 dollars later....she was fixed... but yeah you should get that looked at. I hope its just my tensioner also... Which I suspect it is...
Definitely should get it looked at, I is almost definitely a tensioner pulley. Since the M54 engine is chain driven, not belt driven, the chances of valvetrain disasters is very remote, but having the water pump not pumping water and overheating the engine is definitely not something you want happening either.
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  #10  
Old 09-13-2012, 08:59 PM
chewchewone chewchewone is offline
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same here, just developed that same rattling noise two weeks ago. Did you ever fix it?
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  #11  
Old 09-14-2012, 01:29 PM
Jonesy16 Jonesy16 is offline
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BMW just called to confirm that it is the belt tensioner. They're quoting $900 to replace, but we're hoping BMW will cover it even though I was 1 day out of CPO warranty when I noticed it. If they won't then I'm going to have to try and do it myself because $900 seems outrageous for what sounds like an hour of work and $100 worth of parts. Correct me if I'm wrong.
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  #12  
Old 09-14-2012, 02:20 PM
Supercourse Supercourse is online now
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Quote:
Originally Posted by Jonesy16 View Post
.... $900 seems outrageous for what sounds like an hour of work and $100 worth of parts. Correct me if I'm wrong.
You are right.

Not sure what they have in mind for $900.

Assuming you have a pre-2007 model,
my best guess would be that they are proposing to replace both your A/C tensioner and the main accessory tensioner (for PAS, Alternator, water pump) along with an idler pulley.

They would be using the newer hydraulic tensioners, whether your X3 came with them or the mechanical tensioners.

If an upgrade from mechanical tensioner, a few extra bits needed would bring the total parts cost up to over $300 I think.
Let's say 3 hours labor @$130/hr., and we are up around $700.
Add in shop supplies and tax, and I can't get above $800.

An independent shop might be agreeable to just replacing the one that is a problem,
and using a still available (lower cost) mechanical tensioner or even just a pulley on its own.

For DIY, finding out what you presently have and what you need is a bit of a challenge.
See this E46 discussion which got a bit testy: http://forum.e46fanatics.com/showthread.php?t=917162

IF a Dayco 89133 pulley is all you need, they are about $16 from Rockauto.com.

I did a tensioner replacement for about a $65 part and 1 hour of my time, as noted in the DIY & FAQ:
http://www.bimmerfest.com/forums/sho...5&postcount=39
But it wasn't a squeal - more of a grating sound than disappeared with the new tensioner.
I could have done just the pulley part, but at the time everything I read said that it was not a replaceable component.
Amazon still says a Dayco 89133 does not fit my X3, but I believe that is not correct.
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  #13  
Old 09-14-2012, 02:23 PM
Jonesy16 Jonesy16 is offline
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Wow, thank you for the prompt and detailed response. I'm still hoping that BMW will cover it under goodwill, but I guess I'll have some big decisions to make if they don't. I didn't realize there was quite so much confusion over the over the tensioners as far as mechanical vs. hydraulic goes. And yes, my X3 is a 2006 3.0i. The sound appears to be coming from the EXACT same spot as the first video at the top of this page.
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  #14  
Old 09-14-2012, 08:35 PM
noego noego is online now
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http://blog.bavauto.com/5569/bmw-ser...ent-diy-video/
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  #15  
Old 09-15-2012, 08:18 PM
chewchewone chewchewone is offline
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heck, at least they figured out the problem, the dealership here couldn't figure my car's noise after spending an hour and paid $120, so they want to charge me an additional $422 just open up the engine to see if they can find the culprit... i said no thanks and went on my way.. and found an indy shop in town, have an appt with them next Friday.... hopefully it is just the tensioner pulley and not internal engine, vanos or timing chain related... posted mine here...

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  #16  
Old 09-22-2012, 06:45 PM
chewchewone chewchewone is offline
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Quote:
Originally Posted by chewchewone View Post
heck, at least they figured out the problem, the dealership here couldn't figure my car's noise after spending an hour and paid $120, so they want to charge me an additional $422 just open up the engine to see if they can find the culprit... i said no thanks and went on my way.. and found an indy shop in town, have an appt with them next Friday.... hopefully it is just the tensioner pulley and not internal engine, vanos or timing chain related... posted mine here...

update: i took it to an Indy shop in town, found the problem to be a bad water pump. They replaced it and noise is completely gone. Paid less than what the dealer wanted to charge me just to try to figure out the problem. I'm a happy camper.
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  #17  
Old 09-22-2012, 08:48 PM
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X3-terrestrial X3-terrestrial is offline
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Wow. Stick with that Indy my friend!
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  #18  
Old 09-23-2012, 04:46 AM
usaret usaret is offline
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Wow. Stick with that Indy my friend!
+1

That kind of service and honesty is getting hard to come by..... and Chris Hansen from Dateline NBC has made a career proving it.
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  #19  
Old 09-23-2012, 05:12 AM
codog2 codog2 is offline
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Quote:
Originally Posted by chewchewone View Post
update: i took it to an Indy shop in town, found the problem to be a bad water pump. They replaced it and noise is completely gone. Paid less than what the dealer wanted to charge me just to try to figure out the problem. I'm a happy camper.
I'd call the dealer and why their mechanics couldn't diagnose the faulty water pump and ask for your $120 back.

I did that with my probe gt dealer. Squealing at start was diagnosed as bad compressor was actually a loose belt
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