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Old 04-06-2012, 06:04 AM   #1 (permalink)
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Default Please help diagnose a noise

Hi all,
Long time lurker, first time poster. And I need help.
My wife's '09 Forester with 5MT is making a noise that neither I nor my mechanic can identify.
It's like a low metalic-ish scraping sound. Not a grind, more of a low scrape. I tried to capture it on a video here:
Subie noise - YouTube
but it's very hard to hear on the video. Please turn your volume up pretty high. At about the 2 second mark I push in the clutch so you can hear a little better. Unfortunately in the video it probably just sounds like road/tire noise. But it's very apparent when you're in the car.
It happens moving forward or backward.
Applying the brakes doesn't change it.
It doesn't really increase in noise or pitch with speed, but you have to be moving to hear it. It's pretty constant.
Turning the steering wheel makes no difference.
Clutch in or out makes no difference.
If you clutch in and rev the engine that makes no difference.
It sounds like it's coming from the front. The best way I could describe it was if you were to drag a really thick piece of cardboard along the ground while moving.
We've checked the brakes, wheel bearings, tires, transmission fluid is new and clean.
I'm guessing we're going to have the transmission and xfers cases pulled apart.
But it's really weird that it doesn't change with the speed, but once you're moving you hear it.
Anyone have any ideas?
Thank you,
Jim
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Old 04-06-2012, 06:10 AM   #2 (permalink)
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Default I hade a Civic Real-Time AWD...

Do that. It is transmission specific(ie the car has to be moving)???

On the Civic it turned out to be the throw out bearing.

I take it the noise we are supposed to be listening for the is the one that is like a tapping scrape...
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Old 04-06-2012, 06:13 AM   #3 (permalink)
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We thought of the throw out bearing but thought we'd hear a change in the noise when putting the clutch in our out and/or moving the stick ****.
There's no taping to the sound, just a steady low growl.
But yeah, I was leaning toward the TO bearing too.
Thanks,
Jim
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Old 04-06-2012, 06:31 AM   #4 (permalink)
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Does the noise change with engine speed?
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Old 04-06-2012, 06:33 AM   #5 (permalink)
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Quote:
Originally Posted by visualsinz View Post
Does the noise change with engine speed?
No. For example if you're driving along and push in the clutch and rev the engine it makes no difference to the sound.
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Old 04-06-2012, 07:41 AM   #6 (permalink)
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What kind of "Transmission Fluid" did you put in your 5MT?
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Old 04-06-2012, 08:19 AM   #7 (permalink)
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Quote:
Originally Posted by trailangel View Post
What kind of "Transmission Fluid" did you put in your 5MT?
Whatever the "stealership" uses. My wife insists on her car going there for service.
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Old 04-07-2012, 12:12 PM   #8 (permalink)
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Where in VT? I / we might be able to give you some sets of ears.
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Old 04-08-2012, 07:37 AM   #9 (permalink)
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Where in VT? I / we might be able to give you some sets of ears.
I'd love some ears. I live up in Georgia. Could meet u somewhere.
Thanks,
Jim
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Old 04-08-2012, 03:44 PM   #10 (permalink)
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The group of us live in Winooski, Essex, and South Burlington. I'll see when people are free, more ears the better.
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Old 04-09-2012, 06:43 AM   #11 (permalink)
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could be the driveshaft. Had a low volume scraping sound on my10. U can barely hear it unless driving in narrow streets to reverberate the sound. Its not the brake pads, wheel bearing, nor engine. Had the tech put on lift and they isolated the sound. Drive shaft replaced under warranty.
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Old 04-09-2012, 01:06 PM   #12 (permalink)
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Would appreciate extra ears to figure this out.
No need to drive on quiet street. Pretty easy to hear.
Please let me know when u could take a listen. After work?
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