What is that noise?

tirkish · 06-01-2010, 04:19 PM

When I punch into boost, I get a strange squeal.

Sounds like a cross between a boost leak and a squealing belt. Doesn't happen every time, but I'd say 80% of the time.

Happens right around 4K rpm.

Some notes about the car:
TMIC never removed.
ZERO mods whatsoever under hood.
Only mod is a CBE.
under 30K miles.

Sound in't great in the video, but you'll hear it clearly on the second pull.

http://www.youtube.com/watch?v=2SoCYp6S51w

NitroTrike · 06-01-2010, 04:24 PM

Do you have the a/c on? lol

tirkish · 06-01-2010, 04:26 PM

Quote:

Originally Posted by NitroTrike

Do you have the a/c on? lol

Forgot to mention that.

No, the A/C compressor is not on.

Omega79 · 06-01-2010, 04:55 PM

From the video that sounds very much like belt squeal. Maybe idler pulley issue? GR with under 36k miles? Why not take it to the dealer?

tirkish · 06-01-2010, 05:21 PM

Dropping it off in the AM at my dealer. Just hoping for some forum feedback.

ejicon · 06-01-2010, 08:17 PM

Definitely sounds like a belt. There's nothing else I can think of that would cause such a noise. Boost leak doesn't sound like that at all.
Exhaust leaks make a hissing, air-blowing-in-a-plastic-bag type of noise.

Sounds like a beat from an old 80's rap song.

etothen · 06-01-2010, 08:27 PM

+1 for belt squeal.

BTW you do a great RW

emoticon.

tirkish · 06-01-2010, 08:38 PM

Quote:

Originally Posted by etothen

+1 for belt squeal.

BTW you do a great RW

emoticon.

Yes, that was what I was going for! "

"

Well, the belt scenario was my immediate gut feeling, but some others led me to believe it was potentially a leak. Being that I'm bone stock, I'm hoping it's just a matter of adjusting/replacing a belt as apposed to tracing a leak somewhere.

I'll know tomorrow and post the results. Thanks all!

simonella_virus · 06-01-2010, 08:25 PM

sounds like someone's slowly squeaking air out of a balloon.

RideAllnight · 06-02-2010, 12:35 PM

Quote:

Originally Posted by simonella_virus

sounds like someone's slowly squeaking air out of a balloon.

lol i was thinking the same thing

andrius · 06-01-2010, 08:41 PM

ya def a belt.

Omega79 · 06-02-2010, 12:33 AM

So you're paranoid lol!

It sounds the same as when my friends idler pulley went bad, I wouldn't sweat it. Let us know how it goes.

I concur very good unamused face btw.

tirkish · 06-02-2010, 12:34 PM

Dropped the Rex at the Dealer this morning to investigate my boost leak/belt squeal sound.

They ran the fog test on her respiratory system and found no leaks. A good sign. They couldn't, however, duplicate the noise. I had to go there, drive the car on 95 with a tech in the car to show him. Luckily it made the noise (it sometimes doesn't), and I also played the above vid on my sound system for the whole shop.

Still a mystery, but he thinks it might be the A/C belt, being that it's a fixed belt with no adjustment... so if it should stretch a bit, it's done. They're replacing now, so we'll see by end of day.

Fingers crossed

NitroTrike · 06-02-2010, 02:55 PM

Quote:

Originally Posted by tirkish

Dropped the Rex at the Dealer this morning to investigate my boost leak/belt squeal sound.

They ran the fog test on her respiratory system and found no leaks. A good sign. They couldn't, however, duplicate the noise. I had to go there, drive the car on 95 with a tech in the car to show him. Luckily it made the noise (it sometimes doesn't), and I also played the above vid on my sound system for the whole shop.

Still a mystery, but he thinks it might be the A/C belt, being that it's a fixed belt with no adjustment... so if it should stretch a bit, it's done. They're replacing now, so we'll see by end of day.

Fingers crossed

A fixed belt with no adjustment? When did they start using auto tensioners?

tirkish · 06-02-2010, 06:53 PM

Quote:

Originally Posted by NitroTrike

A fixed belt with no adjustment? When did they start using auto tensioners?

Not auto tension... from Soobie Shop Manual:

"NOTE: Because the rear side belt is a stretch type belt, it is
not necessary to check deflection and tension."

ejicon · 06-02-2010, 06:34 PM

keeping fingers crossed for ya.

tirkish · 06-02-2010, 06:56 PM

UPDATE

It's not the Rear Side Belt (going up to the Compressor), since that was replaced.

After replacing the belt, there is still a sound, albiet slightly different. Now there is a definite "wooshing" when turbo is spooled.... it's a leak. I think, at least.

The dealer ordered new gaskets for the TMIC, which they will install when they come in next week. Hoping that solves it. Another tech remembered a similar problem on a newer car and that did the trick. We'll see.

Got a free belt and install out of it

tirkish · 06-09-2010, 05:11 PM

UPDATE :: RESOLVED! (for now)

Throddle Body to Intake Manifold O-Ring was defective

beverett82 · 07-07-2010, 12:29 AM

I am getting the exact same noise on my 2002 WRX, only it is starting much sooner, pretty much anytime during acceleration. I started hearing it after my car had been repaired from hitting a deer. When I took the car back to the dealer, I was told that the noise was the turbo going bad. SO, I replaced the TD04L with a brand new one, and guess what.. Still getting the exact same noise. I have GOT to get this noise fixed, as it is very annoying and very audible from outside the cab. Was the mentoined repair difficult to do yourself, or did you have the dealer do it? Any help/advice is appreciated.

beverett82 · 07-08-2010, 03:44 PM

Just found out today that the source of my car's noise was mostly due to the fact that the last shop to work on it failed to tighten anything on or around the IC. Luckily, I believe I've FINALLY found a good Subaru mechanic in downstate IL.

07-07-2010, 12:29 AM	#19
beverett82 Scooby Newbie Member#: 251298 Join Date: Jul 2010 Location: Washington Vehicle: 2006 Impreza WRX Blue	I am getting the exact same noise on my 2002 WRX, only it is starting much sooner, pretty much anytime during acceleration. I started hearing it after my car had been repaired from hitting a deer. When I took the car back to the dealer, I was told that the noise was the turbo going bad. SO, I replaced the TD04L with a brand new one, and guess what.. Still getting the exact same noise. I have GOT to get this noise fixed, as it is very annoying and very audible from outside the cab. Was the mentoined repair difficult to do yourself, or did you have the dealer do it? Any help/advice is appreciated. Last edited by beverett82; 07-07-2010 at 01:30 PM.

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06-01-2010, 04:24 PM	#2
NitroTrike Scooby Specialist Member#: 62408 Join Date: May 2004 Chapter/Region: South East Location: GWR, Florida Vehicle: 2002 wrx w/ STi guts 174k miles on Mobil 1	Do you have the a/c on? lol

06-01-2010, 04:55 PM	#4
Omega79 Scooby Newbie Member#: 244020 Join Date: Apr 2010 Chapter/Region: SWIC Location: LHC, AZ Vehicle: 92x2 Leg SS & L AWD hhhWhite x 2	From the video that sounds very much like belt squeal. Maybe idler pulley issue? GR with under 36k miles? Why not take it to the dealer?

06-01-2010, 05:21 PM	#5
tirkish Scooby Specialist Member#: 171886 Join Date: Feb 2008 Chapter/Region: Tri-State Location: Freshchester, NY Vehicle: 09 WRX Premium MurderShine	Dropping it off in the AM at my dealer. Just hoping for some forum feedback.

06-01-2010, 08:17 PM	#6
ejicon Scooby Guru Member#: 2452 Join Date: Sep 2000 Chapter/Region: SCIC Location: Burbank,California, USA Vehicle: 08 2.5 WRX WRB Mica	Definitely sounds like a belt. There's nothing else I can think of that would cause such a noise. Boost leak doesn't sound like that at all. Exhaust leaks make a hissing, air-blowing-in-a-plastic-bag type of noise. Sounds like a beat from an old 80's rap song.

06-01-2010, 08:27 PM	#7
etothen Scooby Specialist Member#: 221885 Join Date: Aug 2009 Chapter/Region: NWIC Location: Portland Vehicle: 09 Ivory Tower Ivory...duh	+1 for belt squeal. BTW you do a great RW emoticon.

06-01-2010, 08:25 PM	#9
simonella_virus Scooby Specialist Member#: 183875 Join Date: Jul 2008 Chapter/Region: E. Canada Location: waterloo, ON Vehicle: 2007 WRX STi Stg2 WRB	sounds like someone's slowly squeaking air out of a balloon.

06-01-2010, 08:41 PM	#11
andrius Scooby Newbie Member#: 211519 Join Date: May 2009 Chapter/Region: MWSOC Location: oak forest il Vehicle: 2007 wrx wrb	ya def a belt.

06-02-2010, 12:33 AM	#12
Omega79 Scooby Newbie Member#: 244020 Join Date: Apr 2010 Chapter/Region: SWIC Location: LHC, AZ Vehicle: 92x2 Leg SS & L AWD hhhWhite x 2	So you're paranoid lol! It sounds the same as when my friends idler pulley went bad, I wouldn't sweat it. Let us know how it goes. I concur very good unamused face btw.

06-02-2010, 12:34 PM	#13
tirkish Scooby Specialist Member#: 171886 Join Date: Feb 2008 Chapter/Region: Tri-State Location: Freshchester, NY Vehicle: 09 WRX Premium MurderShine	Dropped the Rex at the Dealer this morning to investigate my boost leak/belt squeal sound. They ran the fog test on her respiratory system and found no leaks. A good sign. They couldn't, however, duplicate the noise. I had to go there, drive the car on 95 with a tech in the car to show him. Luckily it made the noise (it sometimes doesn't), and I also played the above vid on my sound system for the whole shop. Still a mystery, but he thinks it might be the A/C belt, being that it's a fixed belt with no adjustment... so if it should stretch a bit, it's done. They're replacing now, so we'll see by end of day. Fingers crossed

06-02-2010, 06:34 PM	#16
ejicon Scooby Guru Member#: 2452 Join Date: Sep 2000 Chapter/Region: SCIC Location: Burbank,California, USA Vehicle: 08 2.5 WRX WRB Mica	keeping fingers crossed for ya.

06-02-2010, 06:56 PM	#17
tirkish Scooby Specialist Member#: 171886 Join Date: Feb 2008 Chapter/Region: Tri-State Location: Freshchester, NY Vehicle: 09 WRX Premium MurderShine	UPDATE It's not the Rear Side Belt (going up to the Compressor), since that was replaced. After replacing the belt, there is still a sound, albiet slightly different. Now there is a definite "wooshing" when turbo is spooled.... it's a leak. I think, at least. The dealer ordered new gaskets for the TMIC, which they will install when they come in next week. Hoping that solves it. Another tech remembered a similar problem on a newer car and that did the trick. We'll see. Got a free belt and install out of it

06-09-2010, 05:11 PM	#18
tirkish Scooby Specialist Member#: 171886 Join Date: Feb 2008 Chapter/Region: Tri-State Location: Freshchester, NY Vehicle: 09 WRX Premium MurderShine	UPDATE :: RESOLVED! (for now) Throddle Body to Intake Manifold O-Ring was defective

07-08-2010, 03:44 PM	#20
beverett82 Scooby Newbie Member#: 251298 Join Date: Jul 2010 Location: Washington Vehicle: 2006 Impreza WRX Blue	Just found out today that the source of my car's noise was mostly due to the fact that the last shop to work on it failed to tighten anything on or around the IC. Luckily, I believe I've FINALLY found a good Subaru mechanic in downstate IL.