Welcome to the North American Subaru Impreza Owners Club Wednesday April 23, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 06-07-2005, 08:49 PM   #1
Doob
Scooby Newbie
 
Member#: 72493
Join Date: Oct 2004
Chapter/Region: W. Canada
Location: Calgary Alberta
Vehicle:
97 outback sport
red

Default Whining noise under load

Hey guys,

I just noticed today on the drive home that my cars driveline is making an unusual whining noise under load.

(yes I did a search, i didn't come up with anything that accurately described my problem)

I haven't had a chance to investigate as much as I'd like, but what i've determined so far is that between 3900 and about 5600 RPM I hear a new whining noise, (I think) from behind me. The noise only occurs under acceleration, if I lift my foot off the throttle it dissappears. It only occurs when the car is in gear, and so far I've only been able to confirm it's existence in 1st and 2nd gear (more testing in 3rd and 4th tomorrow hopefully).

The noise gets a little bit louder, and a little bit higher pitched as the revs rise.

Any ideas as to what it could be?

I spoke breifly with a local subaru dealer and they theorized it might be the awd transfer case bearing.

Also, I'm very interested to hear if that problem (or if what you think the problem is) could be as a result of improper towing. My car was towed yesterday and i don't recall hearing this noise before that. I was told that it was towed with the rear wheels on dollies so there SHOULDN'T have been any damage. That, of course, is assuming they told me the truth.

Finally, if it's the transfer case bearing, anyone have theories as to how much it might cost have it repaired/replaced? Likewise, if you think there's a different problem, I'd like to hear how much it could cost me. Also, is this a serious problem? Does it need to be addressed now before some kind of catastrphic failure, or is this the kind of problem that ought to be more or less benign?

Thanks for your time and expertise,
Doob
* Registered users of the site do not see these ads.
Doob is offline   Reply With Quote
Old 06-07-2005, 09:12 PM   #2
Doob
Scooby Newbie
 
Member#: 72493
Join Date: Oct 2004
Chapter/Region: W. Canada
Location: Calgary Alberta
Vehicle:
97 outback sport
red

Default

updates and corrections

First of all, the whining/whistling/high pitched noise doesn't occur all the time between 3900 & 5500 when in gear, I must be at or near WOT.

Second of all, I was mistaken, the noise does occur when in neutral, and when the clutch is depressed (I obviously wasn't putting it to WOT under those condiions before).

I tested in 3rd gear (need to get out of the city to test 4th gear, at 3900+ with WOT), and it didn't seem to occur in 3rd.

I'm also uncertain as to where this sound is coming from, I thought it was coming from behind before, but now I'm not so sure.

So, given this new information, my new theory is this could be drivetrain, exhaust, or something to do with the engine... I have infact only made things more ambiguous as a result of further testing =/ but at least now the information is more accurate...
Doob is offline   Reply With Quote
Old 06-08-2005, 11:58 AM   #3
Doob
Scooby Newbie
 
Member#: 72493
Join Date: Oct 2004
Chapter/Region: W. Canada
Location: Calgary Alberta
Vehicle:
97 outback sport
red

Default

Could a mod please move this thread to naturally asperated?

My new leading theories are engine/exhaust...
Doob is offline   Reply With Quote
Old 06-15-2005, 01:32 PM   #4
Doob
Scooby Newbie
 
Member#: 72493
Join Date: Oct 2004
Chapter/Region: W. Canada
Location: Calgary Alberta
Vehicle:
97 outback sport
red

Default

bump

any ideas guys?
Doob is offline   Reply With Quote
Old 06-15-2005, 05:51 PM   #5
mrpedal
Scooby Newbie
 
Member#: 71361
Join Date: Sep 2004
Chapter/Region: BAIC
Location: SFBay
Vehicle:
2000 Impreza 2.5RS
silver

Default

Any chance you got a CAI on that? That's almost exactly the rpm range where mine starts screaming (Just a Ganzflow tube mod on mine). I mention this also because I noticed it more when I didn't have it securely on after a fliter cleaning, and the whine went away after tightening things back up. Just a guess. Maybe you can tell us more about recent maintence to your car (or lack there of, if that's more pertinent )
mrpedal is offline   Reply With Quote
Old 06-15-2005, 10:47 PM   #6
CitySubie
Scooby Newbie
 
Member#: 60099
Join Date: Apr 2004
Location: N.Y.C.
Vehicle:
2003 Impreza RS
The perty blue one

Default

Tranny bearing. Happened to me. It will get louder and louder as the bearing gets worse. Then it seizes. Then you're in trouble.

Our AWD cars should only be towed on a flat bed.
CitySubie is offline   Reply With Quote
Old 06-16-2005, 12:37 AM   #7
Doob
Scooby Newbie
 
Member#: 72493
Join Date: Oct 2004
Chapter/Region: W. Canada
Location: Calgary Alberta
Vehicle:
97 outback sport
red

Default

you think tranny even though the noise occurs in neutral and with the clutch in?

As for CAI, nope, but I do have a K&N, it hasn't been touched since it was installed (about 4500km ago). I was planning to go in for my 96k service in another 1000km, I'm not sure if this should wait though. I'll check the intake and see if that's it, hopefully that's all it is.
Doob is offline   Reply With Quote
Old 06-16-2005, 01:53 AM   #8
darkwaterz
Scooby Newbie
 
Member#: 65165
Join Date: Jun 2004
Chapter/Region: MWSOC
Location: Fayetteville AR, USA
Vehicle:
97 OBS
i miss my RS...

Default

There's a similar problem described in the technical/mantainance forum... the consensus seems to be a leak in the exhaust system, do a search for "high pitched squeal" in that forum for more lengthy details.

z.
darkwaterz is offline   Reply With Quote
Old 06-16-2005, 07:50 AM   #9
Rioken
Scooby Newbie
 
Member#: 80263
Join Date: Jan 2005
Default

my car did the same thing, went away after I put the exhaust on it
Rioken is offline   Reply With Quote
Old 06-16-2005, 01:25 PM   #10
Doob
Scooby Newbie
 
Member#: 72493
Join Date: Oct 2004
Chapter/Region: W. Canada
Location: Calgary Alberta
Vehicle:
97 outback sport
red

Default

I'm leaning towards exhaust too, cause over the past week, it seems to have become a bit raspier under engine braking, and maybe even a little bit of rattle (again, under engine breaking).

So, if it's exhaust, do you figure it's a fault of some sort? or more likely just some loose bolts?

Hopefully I can take a closer look this weekend when I have more time.
Doob is offline   Reply With Quote
Old 06-17-2005, 07:17 AM   #11
Sober_One
Scooby Newbie
 
Member#: 83322
Join Date: Mar 2005
Location: Ottawa, Ontario, Canada
Vehicle:
2000 Impreza 2.5RS
Sylverthorn

Default

You may have good ears and be detecting the initial signs of wheel bearing failure. Wheel bearings have been known emit some weird whining noises during their failure.
Just another thought.
Sober_One is offline   Reply With Quote
Old 06-17-2005, 04:29 PM   #12
Doob
Scooby Newbie
 
Member#: 72493
Join Date: Oct 2004
Chapter/Region: W. Canada
Location: Calgary Alberta
Vehicle:
97 outback sport
red

Default

But wouldn't wheel bearing noise be related to speed and not rpm?
Doob is offline   Reply With Quote
Old 06-17-2005, 06:48 PM   #13
wht052.5
Scooby Newbie
 
Member#: 79527
Join Date: Jan 2005
Location: Christian's Mecca, CO
Vehicle:
2005 2.5RS(I NDTRBO)
Chipped Crystal Gray

Default

Rear diff?
wht052.5 is offline   Reply With Quote
Old 06-18-2005, 12:05 AM   #14
Sober_One
Scooby Newbie
 
Member#: 83322
Join Date: Mar 2005
Location: Ottawa, Ontario, Canada
Vehicle:
2000 Impreza 2.5RS
Sylverthorn

Default

I thought that if the noise only happens when the car is rolling, than it may be a wheel bearing.
Maybe I misunderstood the part about being in neutral and the clutch
Sober_One is offline   Reply With Quote
Old 06-18-2005, 03:31 PM   #15
Doob
Scooby Newbie
 
Member#: 72493
Join Date: Oct 2004
Chapter/Region: W. Canada
Location: Calgary Alberta
Vehicle:
97 outback sport
red

Default

In my first post I said it didn't happen at a stand still in neutral/with the clutch in, but in my second post I corrected myself. Apparently the noise only happens in those rev ranges when at or near WOT, which I wasn't trying at first (a little hesitant to go WOT in neutral).

As for rear diff, I had thought of that too, but figured it should be more of a grinding/clunking noise than a whistle/whine, correct? Also, I would expect a rear diff to be more consistent in it's noise generation.
Doob is offline   Reply With Quote
Old 06-19-2005, 08:47 AM   #16
tmeh
Scooby Newbie
 
Member#: 30800
Join Date: Dec 2002
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2000 .7 RS

Default

if its exhaust its easy to check theres only a few places it'd leak, and if your car is all original it's probably the graphite donut section after the cat... it will deteriorate over time.

you can wrap tin foil around the sections with gaskets to see if any black builds up on it, or if its a really bad leak it'll burn a hole in the tin foil

but chances are if you can pick off sections of that flex donut thats your problem


and a worn pinion in the rear dif will make a whine, but its a totally differnt sound from an exhaust leak, resonates through the whole car (depending on your level of bushing/mount mods)

Last edited by tmeh; 06-19-2005 at 08:48 AM. Reason: more info
tmeh is offline   Reply With Quote
Old 06-20-2005, 04:31 PM   #17
Doob
Scooby Newbie
 
Member#: 72493
Join Date: Oct 2004
Chapter/Region: W. Canada
Location: Calgary Alberta
Vehicle:
97 outback sport
red

Default

We took a closer look yesterday and it seemed to be loudest near the front of the car, possibly around the first cat there, which corresponds to your theory nicely.

We were worried it might be the cat, but you think it's possible it's just the graphite donut? That sounds less expensive than a new cat, am I correct in that assumption?

Finally, am I doing any damage by not addressing a potential exhaust leak early on? I suspect the only problems would be sound levels and maybe exposure to exhaust gasses when idling.

The reason I ask is I just bought a house and I really don't have the cash to take care of this right now...
Doob is offline   Reply With Quote
Old 06-20-2005, 06:46 PM   #18
tmeh
Scooby Newbie
 
Member#: 30800
Join Date: Dec 2002
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2000 .7 RS

Default

good custom exhaust shops will only charge you around $30-50 to change that donut. you can do it yourself, you just need the donut and some red exhaust gasket maker, plus maybe some help compressing the springs when you put the pipe back together.

exhaust leaks affect performance, somewhat. more irritating than anything, really.
tmeh is offline   Reply With Quote
Old 06-20-2005, 07:49 PM   #19
mranlet
Scooby Specialist
 
Member#: 66304
Join Date: Jul 2004
Location: Tampa
Vehicle:
98 RWD BG Outback
...with R200 and ITBs ;)

Default

If you have a mega hardcore leak up at the exhaust flange, you can burn up your valves, but it sounds like you're far away from that.

I had something that would fit your description, but it turned out to be a Throwout Bearing that had not been lubed (or had lost all it's lube). Made a noise like air hissing except for when I put the clutch in, even while rolling in 4th gear or stopped.
mranlet is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Strange noise under load quadtard Transmission (AT/MT) & Driveline 9 12-18-2007 07:14 PM
MT Noise under load RobJ Transmission (AT/MT) & Driveline 0 11-15-2007 12:49 AM
installed teins...noise under load...normal? fireantresq Brakes, Steering & Suspension 3 05-31-2006 11:27 AM
Feint Noise under load / acceleration rukkie Factory 2.0L Turbo Powertrain 6 11-23-2005 07:49 PM
help me diagnose a weird noise under load Capt Crunch Factory 2.0L Turbo Powertrain 2 10-17-2004 07:42 PM


All times are GMT -4. The time now is 01:11 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.