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Old 10-08-2004, 02:24 PM   #1
volkl23
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Default Took out my rear seat and drove around, but noticed it is loud as hell

It is loud as hell without the sound deadening of the rear seat pad! Especially on highways, I could hear a sound that sounds EXACTLY like a circular saw cutting a 2x4. The similiarity is uncanny. It's as if I had a woodshop back there.

I noticed that if I let off the gas at around 70-75mph, I would get this very high-pitched grinding sound (circular saw cutting a 2x4). It seems to be the loudest when I let the gas off. If I'm accelerating, it's not as bad.

Is this the deceleration noise that I hear about on Nasioc, but amplified because I don't have the rear seats installed?
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Old 10-08-2004, 02:49 PM   #2
garface
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Sounds like the rear diff possibly. I was thinking wheel bearing at first, but doesn't seem like it.
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Old 10-08-2004, 06:38 PM   #3
Legacy777
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is it a whining type sound? you do know what the fuel pump sounds like? It's sort of a high pitch whine sound
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Old 10-09-2004, 07:22 AM   #4
wrx plus
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Noise = rear diff, all rear diffs make that noise, it's the gears. Most people just don't notice because of the sound damping material or stereo.
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Old 10-11-2004, 02:25 AM   #5
volkl23
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Thanks for the reply guys...

LEgacy: I am not familiar with the sound a fuel pump makes. The sound I am experiencing is of a whining nature (sound of a circular saw cutting a 2x4) so it might be it...although, I do hear the "saw" sound the most when I let off the gas and when the speedos around 75mph or so. Would the fuel pump make sounds when I'm not on the gas?

I think I might know what the fuel pump sounds like. Everytime I start the car, I hear a really high-pitched sound (sort of eletronic sounding, but different from the "saw" sound I'm hearing on the highway) coming from the back. It would only last for 5 seconds or so and then it would disappear. Is that the sound of the fuel pump?

I'm guessing it might be the differentials. I just don't know if it's normal or not I'm going to change my rear diff oil soon (i'm at 24k miles) so maybe that will help out a little.
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Old 10-11-2004, 08:55 AM   #6
Legacy777
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Does the noise change much with speed? If so, it's probably not the fuel pump.
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Old 10-11-2004, 10:15 AM   #7
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my fuel pump makes a lot of different noises depending upon the fuel flow
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Old 10-11-2004, 11:49 AM   #8
volkl23
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Quote:
Originally Posted by legacy777
Does the noise change much with speed? If so, it's probably not the fuel pump.
It does change a lot, but I don't think it's the fuel pump sound now. Unless the fuel pump sounds like a circular saw cutting a 2x4 (or even a sharpening tool sharpening a blade), I don't think it's that.

Also, it makes a lot of sound when I'm coasting and not on the gas. Maybe it's all nothing, because I really couldn't hear it with the rear seat installed.
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Old 10-11-2004, 11:50 AM   #9
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hmm
my rs also makes that noise at certain vibrational frequencies
the pass center pillar <whatever its called> rattles really fast and sounds kinda like that, its not deafening but similiar
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Old 10-11-2004, 01:06 PM   #10
Legacy777
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Quote:
Originally Posted by volkl23
It does change a lot, but I don't think it's the fuel pump sound now. Unless the fuel pump sounds like a circular saw cutting a 2x4 (or even a sharpening tool sharpening a blade), I don't think it's that.

Also, it makes a lot of sound when I'm coasting and not on the gas. Maybe it's all nothing, because I really couldn't hear it with the rear seat installed.
Well....I wouldn't think it to be the fuel pump then....and wheel bearings probably wouldn't change sound or increase when going from accelerating to coasting. I'd probably say it's a drivetrain issue, rear possibly.

Subaru does have a 60k drivetrain warranty right? I'd just take it to the dealer....even if it's only 36k, I'd still take it to the dealer. Sounds like warranty work to me.
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Old 10-11-2004, 01:19 PM   #11
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yea i noticed the same sound when i had my rear seat out and always wondered what it was. The sound i got didnt happen until higher rpms though. Everytime i reached like 4500-7k i would get an extremely loud buzz sound. I couldn't imagine this be the fuel pump or sound deadening preventing me from hearing the sound since it is so loud. I think its just the seat belts hitting the hard plastic and making that buzz sound. With the seats there its soft and it has nothing to smack against that would make that noise under.
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Old 10-11-2004, 10:01 PM   #12
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i have recently taken out my back seats, and the only sound i hear thats different before is the exhaust comes through the car a little bit more....(shoptime!)
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Old 10-11-2004, 10:39 PM   #13
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whoa people. dont shut out wheel bearings or a bad CV so quickly. One or both is bad on my car and it shakes differntly according on throttle position. the sound would occur with hard driving. this week my rear seat has been out and the noise is there even w/ regular driving, which means it was always there, i just couldnt hear it.
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Old 10-12-2004, 12:06 AM   #14
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WRX's have no sound deadning material. I have had my seat out numerous times. For days sometimes. My 03 makes no such noise. I do have knocking from solid camber plates but the noise you describe is foreign. Always thought that wads the reason for the 3.54 and 3.9 in the front. The rear is quieter. With the seat completly out, I was amazed how I could not hear anything but the exhaust and metal resonating.

I now have tons of dynamat extreme in my trunk and passanger area. Now all I hear is exhaust. no metal resonating and definitly no buzzing.

May seem basic, but did you check the oil level in the rear diff? I imagine if it were low you would hear gear wine more easily.
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Old 10-13-2004, 09:10 AM   #15
volkl23
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^^ I think you might be onto something. I have never checked my rear diff level before. Do I just unbolt the top screw and see where oil level is? If it's low, do I just stick a finger in and see how low I have to go before I touch the gear oil?
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Old 10-13-2004, 09:45 AM   #16
Legacy777
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The gear oil level should be at the bottom of the top filler hole. If it's not, add some more until is starts dripping out.
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Old 10-13-2004, 05:22 PM   #17
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Use a turkey baster or something. There are tools for refilling it but turkey baster works fine too.
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