Welcome to the North American Subaru Impreza Owners Club Tuesday February 28, 2017
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
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 03-27-2014, 05:18 PM   #1
Ryder0724
Scooby Newbie
 
Member#: 362819
Join Date: Jul 2013
Location: Charlotte, NC
Vehicle:
2007 Impreza 2.5i
silver

Post High pitched whine under heavy acceleration

As the title suggests I have a high pitched whining noise when my car is under heavy acceleration. It's done it for the past 7 or so months that i've had the car. It is the 2.5i N/A motor. No mods to the motor, trans, exhaust or anything mechanical. The clutch was replaced about 3 or 4 thousand miles ago (did it myself) but the noise was there before it was changed. I had hoped it was the pilot bearing or the throw out bearing but the noise stayed the same. It only occurs under heavy acceleration regardless of gear, speed, weather conditions, etc. It gets more high pitched as RPM's go up. I've seen many things online about it being the idler pulley, wheel bearings, front and center differential but I'm not sure of any ways to narrow things down without throwing parts at it, and if i had the money to do that i would've got a WRX or STI.

ANY advice on how to narrow it down or ideas on what it could be, would be greatly appreciated!!
* Registered users of the site do not see these ads.
Ryder0724 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 03-27-2014, 06:00 PM   #2
Ryder0724
Scooby Newbie
 
Member#: 362819
Join Date: Jul 2013
Location: Charlotte, NC
Vehicle:
2007 Impreza 2.5i
silver

Default

Update*** it's definitely not the idler pulley because i removed it completely and the noise was still there
Ryder0724 is offline   Reply With Quote
Old 03-27-2014, 06:17 PM   #3
James2.5i
Scooby Specialist
 
Member#: 305063
Join Date: Dec 2011
Chapter/Region: Tri-State
Location: Central Jersey
Vehicle:
2016 VDUBBB
DGM

Default

Is it only while in motion, or when you rev stationary? Can you have a buddy hit the gas pedal while you listen in the engine bay? Can you take video of the noise?

Could be a bunch of different things.
James2.5i is offline   Reply With Quote
Old 03-27-2014, 06:23 PM   #4
Ryder0724
Scooby Newbie
 
Member#: 362819
Join Date: Jul 2013
Location: Charlotte, NC
Vehicle:
2007 Impreza 2.5i
silver

Default

It's only in motion. I'll try to get a video, i tired once with my phone and you couldn't hear it i'll try with my gopro next.
Ryder0724 is offline   Reply With Quote
Old 03-27-2014, 06:28 PM   #5
Rudgers73
Scooby Newbie
 
Member#: 141433
Join Date: Feb 2007
Chapter/Region: MAIC
Location: Rochester, NY
Vehicle:
2006 Impreza 2.5i
Obsidian Black

Default

Sounds like it could be cavitation in the power steering pump. I have heard that over time the hose let's air in and froths up the fluid. Does it kind of sound like a supercharger winding up?

Here was my power steering pump this winter one morning when it was extremely cold out:

Rudgers73 is offline   Reply With Quote
Old 03-27-2014, 06:28 PM   #6
Scooby06doo
Scooby Newbie
 
Member#: 378550
Join Date: Jan 2014
Location: PA
Vehicle:
2006 STI
OB

Default

One of my old cars did this. Turned out to be the intake filter I had in it. Almost sounded like turbo. Lol. Went away when I installed an aftermarket exhaust. I'd change air filters(brands maybe) and see if it goes away
Scooby06doo is offline   Reply With Quote
Old 03-27-2014, 06:39 PM   #7
Ryder0724
Scooby Newbie
 
Member#: 362819
Join Date: Jul 2013
Location: Charlotte, NC
Vehicle:
2007 Impreza 2.5i
silver

Default

I guess i did leave a few things out, Power steering pump has been replaced because it went out in december. I heard the same thing with the lines letting in air so i changed the clamps too. It does, however, sound similar to the power steering video you put up just a lot more high pitched kind of like a bearing.

The air filter was changed yesterday as well because i found that was someone elses problem too but still no luck. But i did read that if it isn't completely sealed over the filter it can do this but i'm not sure how i can check that other than leaving the filter box completely open throwing some tape around it to seal it?

a few friends have joked about it sounding like a turbo spool too

Thank you guys for the responses!! keep them coming so we can see if we cant figure this out.

also the gear oil seems fine doesn't look dirty but i will be changing it this weekend to be sure. (it is a 5 speed)
Ryder0724 is offline   Reply With Quote
Old 03-28-2014, 11:33 AM   #8
jbulls93
Scooby Newbie
 
Member#: 315840
Join Date: Apr 2012
Chapter/Region: Tri-State
Location: New York
Vehicle:
2000 2.5rs

Default

Exhaust manifold gasket leak is a possibility. Seen it multiple times. What year is your car?

I had an 04' forester screech under heavy load/acceleration and it was the gaskets. Had an 04' impreza with 250k miles and it turned out there was a leak at the manifold caused by stripped bolt holes for the manifold studs. Easy, cheap repair.
jbulls93 is offline   Reply With Quote
Old 03-28-2014, 12:30 PM   #9
jmanxyz
Scooby Newbie
 
Member#: 386003
Join Date: Mar 2014
Default Possible method to check

Borrow or buy
http://www.rakuten.com/prod/wireless...FcURMwodAx8A4w
Best 300 ever spent!!!
Chassis ears, place ears on all possible locations to may think of for noise. switch channels and isolate where noise is loudest then narrow in on it.

DO NOT LET SOME SHOP TELL YOU ITS THE MOST EXPENSIVE THING TO REPLACE. There are many good dependable repair facilities but many that are NOT!!!
jmanxyz is offline   Reply With Quote
Old 03-28-2014, 06:16 PM   #10
wurlyvalve
Scooby Newbie
 
Member#: 73330
Join Date: Oct 2004
Chapter/Region: International
Location: England
Vehicle:
1998 Legacy BH9
Deep Red

Default

It's not the wife is it?

Ear defenders are the cheap fix!
wurlyvalve is offline   Reply With Quote
Old 03-28-2014, 09:30 PM   #11
Ryder0724
Scooby Newbie
 
Member#: 362819
Join Date: Jul 2013
Location: Charlotte, NC
Vehicle:
2007 Impreza 2.5i
silver

Default

Quote:
Originally Posted by jbulls93 View Post
Exhaust manifold gasket leak is a possibility. Seen it multiple times. What year is your car?
Shouldn't be the gaskets they were changed when i did the clutch but i'll double check this weekend to make sure everything is tight under there. Could an exhaust leak somewhere else on the system cause the same sound?

Quote:
Originally Posted by jmanxyz View Post
Borrow or buy
http://www.rakuten.com/prod/wireless...FcURMwodAx8A4w
Best 300 ever spent!!!
Chassis ears, place ears on all possible locations to may think of for noise. switch channels and isolate where noise is loudest then narrow in on it.

DO NOT LET SOME SHOP TELL YOU ITS THE MOST EXPENSIVE THING TO REPLACE. There are many good dependable repair facilities but many that are NOT!!!
Hopefully someone i know has one, i saw that online the other day as well. So i'm gonna try to get my hands on one to try that out.

Quote:
Originally Posted by wurlyvalve View Post
It's not the wife is it?

Ear defenders are the cheap fix!
Unfortunately not, that would be an easy fix haha
Ryder0724 is offline   Reply With Quote
Old 03-28-2014, 09:41 PM   #12
Scooby06doo
Scooby Newbie
 
Member#: 378550
Join Date: Jan 2014
Location: PA
Vehicle:
2006 STI
OB

Default

Intake manifold gasket new too? Could just be a loose vacuum line somewhere
Scooby06doo is offline   Reply With Quote
Old 03-28-2014, 11:05 PM   #13
Ryder0724
Scooby Newbie
 
Member#: 362819
Join Date: Jul 2013
Location: Charlotte, NC
Vehicle:
2007 Impreza 2.5i
silver

Default

I'm not sure how old the intake gasket is (it's probably the original) but all vacuum lines seem good, i'll double check those again. maybe with some starting fluid?
Ryder0724 is offline   Reply With Quote
Old 03-30-2014, 07:50 PM   #14
Ryder0724
Scooby Newbie
 
Member#: 362819
Join Date: Jul 2013
Location: Charlotte, NC
Vehicle:
2007 Impreza 2.5i
silver

Default

https://www.youtube.com/watch?v=y8_TOgoS97Y

best video i could get of the noise.
Ryder0724 is offline   Reply With Quote
Old 03-31-2014, 12:12 PM   #15
jmanxyz
Scooby Newbie
 
Member#: 386003
Join Date: Mar 2014
Default

Did you replace the throw out bearing during clutch replacement?
jmanxyz is offline   Reply With Quote
Old 03-31-2014, 12:24 PM   #16
Ryder0724
Scooby Newbie
 
Member#: 362819
Join Date: Jul 2013
Location: Charlotte, NC
Vehicle:
2007 Impreza 2.5i
silver

Default

Yes I did
Ryder0724 is offline   Reply With Quote
Old 04-05-2014, 07:01 AM   #17
Jeandre
Scooby Newbie
 
Member#: 381262
Join Date: Feb 2014
Location: Australia
Vehicle:
03 Impreza wagon

Default

i get this exact same thing when i accelerate hard. I have a 2003 2.0. the sound starts around 4-5k rpm and goes till red line.
i havent really checked it out yet but id love to hear what it is if you find it.
Jeandre is offline   Reply With Quote
Old 04-05-2014, 01:01 PM   #18
Ryder0724
Scooby Newbie
 
Member#: 362819
Join Date: Jul 2013
Location: Charlotte, NC
Vehicle:
2007 Impreza 2.5i
silver

Default

Quote:
Originally Posted by Jeandre View Post
i get this exact same thing when i accelerate hard. I have a 2003 2.0. the sound starts around 4-5k rpm and goes till red line.
i havent really checked it out yet but id love to hear what it is if you find it.
Is yours the N/A motor like mine? I would love to figure out what this is!!
Ryder0724 is offline   Reply With Quote
Old 04-09-2014, 08:53 AM   #19
Jeandre
Scooby Newbie
 
Member#: 381262
Join Date: Feb 2014
Location: Australia
Vehicle:
03 Impreza wagon

Default

Quote:
Originally Posted by Ryder0724 View Post
Is yours the N/A motor like mine? I would love to figure out what this is!!
yeah n/a
Jeandre is offline   Reply With Quote
Old 04-09-2014, 11:38 AM   #20
Ryder0724
Scooby Newbie
 
Member#: 362819
Join Date: Jul 2013
Location: Charlotte, NC
Vehicle:
2007 Impreza 2.5i
silver

Default

What all have you done to your car as far as upgrades or mods?
Ryder0724 is offline   Reply With Quote
Old 04-12-2014, 12:57 PM   #21
yarrgh
Scooby Specialist
 
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Bailey, CO
Vehicle:
2001 2.5RS
Black Diamond Pearl

Default

Sure looks like you're getting a misfire during that acceleration. Mine will whistle at certain throttle positions, but I can't tell if that the same sound as your.
yarrgh is offline   Reply With Quote
Old 04-12-2014, 02:20 PM   #22
Ryder0724
Scooby Newbie
 
Member#: 362819
Join Date: Jul 2013
Location: Charlotte, NC
Vehicle:
2007 Impreza 2.5i
silver

Default

Yea I am, its my oxygen sensor just haven't had time to replace it haha
Ryder0724 is offline   Reply With Quote
Old 09-11-2016, 01:50 PM   #23
Sup_nando
Scooby Newbie
 
Member#: 454323
Join Date: Sep 2016
Default

Quote:
Originally Posted by Ryder0724 View Post
Yea I am, its my oxygen sensor just haven't had time to replace it haha
Hey did you ever find out what that noise was? I have an 07 2.5i and its doing the same noise.
Sup_nando is offline   Reply With Quote
Old 09-12-2016, 01:09 PM   #24
lpxltt
Scooby Newbie
 
Member#: 395574
Join Date: Jul 2014
Chapter/Region: NESIC
Location: Almost Cape Cod, MA
Vehicle:
2007 OBS

Default

From my experience, it is the muffler. The baffles inside rust and sometimes creates a hole in just the right place to create a natural "whistle tip". I have had this happen on my 94 Legacy, 03 WRX, 07 Impreza 2.5i, 2000 RS and now my 95 Legacy is doing it. All were the OEM muffler. Once the axle back was changed, all was good.
lpxltt is offline   Reply With Quote
Old 09-14-2016, 09:45 PM   #25
JaneTheImpreza
Scooby Newbie
 
Member#: 454575
Join Date: Sep 2016
Chapter/Region: RMIC
Location: Salt Lake City, UT
Vehicle:
2007 Impreza 2.5i
Steel Gray Metallic

Default

I just replaced my AC Compressor and that made my whine (that sounded exactly like that) go away! Try that. It could also be that or even your alternator.
JaneTheImpreza 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

All times are GMT -4. The time now is 11:31 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2017 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.