Welcome to the North American Subaru Impreza Owners Club Saturday July 12, 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 05-25-2011, 09:38 PM   #1
Bruins1982
Scooby Newbie
 
Member#: 240365
Join Date: Mar 2010
Chapter/Region: NESIC
Location: MA
Vehicle:
2011 WRX Premium
Sedan WRB

Default 2011 Impreza 2.5i Knocking Sound At Low RPMs

My mother just bought a 2011 2.5i base Impreza 5-speed. It seems to have a knocking type sound at low speeds, under load, and at low RPMs. It sounds exactly like the video below even though the video is from a 2004 WRX. She is going to take it to the dealer, but just wanted to see if this was at all common. Both my WRX and my girlfriend's '08 Legacy do not make this noise.

(Turn the speakers up to hear it)
* Registered users of the site do not see these ads.

Last edited by Bruins1982; 05-25-2011 at 09:51 PM.
Bruins1982 is offline   Reply With Quote
Old 05-25-2011, 09:53 PM   #2
yarrgh
Scooby Specialist
 
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
2001 2.5RS
Black Diamond Pearl

Default

almost sounds like the beginning of rod knock, but I really can't tell. Make sure it's good on oil before bringing it in.
yarrgh is offline   Reply With Quote
Old 05-25-2011, 09:55 PM   #3
Bruins1982
Scooby Newbie
 
Member#: 240365
Join Date: Mar 2010
Chapter/Region: NESIC
Location: MA
Vehicle:
2011 WRX Premium
Sedan WRB

Default

Quote:
Originally Posted by yarrgh View Post
almost sounds like the beginning of rod knock, but I really can't tell. Make sure it's good on oil before bringing it in.
Yeah, it's an alarming sound. She literally just got it. I haven't checked the oil, but she just took delivery last Wednesday. It only has 300 miles on it. Thanks.
Bruins1982 is offline   Reply With Quote
Old 05-26-2011, 10:37 PM   #4
kundziu
Scooby Newbie
 
Member#: 283973
Join Date: May 2011
Default

Hey,

My 2011 2.5i 5spd Limited (Canadian Model) makes the exact same noise as described and shown in the video. Only around 2000 rpm, and under light throttle input only. This is a brand new car with only about 1200 km's on it, and now I'm making a service appointment for this week regarding this issue. Any word on what they told your mother regarding this issue?

Cheers.

C
kundziu is offline   Reply With Quote
Old 05-26-2011, 10:55 PM   #5
Bruins1982
Scooby Newbie
 
Member#: 240365
Join Date: Mar 2010
Chapter/Region: NESIC
Location: MA
Vehicle:
2011 WRX Premium
Sedan WRB

Default

Quote:
Originally Posted by kundziu View Post
Hey,

My 2011 2.5i 5spd Limited (Canadian Model) makes the exact same noise as described and shown in the video. Only around 2000 rpm, and under light throttle input only. This is a brand new car with only about 1200 km's on it, and now I'm making a service appointment for this week regarding this issue. Any word on what they told your mother regarding this issue?

Cheers.

C
She hasn't had it checked out yet, but I'm hoping it's minor. If it's not, that's what warranties are for I guess. I will let you know when she takes it in.
Bruins1982 is offline   Reply With Quote
Old 05-27-2011, 06:51 PM   #6
dazzyb
Scooby Newbie
 
Member#: 283863
Join Date: May 2011
Default

Like others said, check the oil. I just ignored the intermittent oil light on our 2005 Outback and just blew the engine when I red lined it. That lack of paying attention is going to cost me approx $5k...
dazzyb is offline   Reply With Quote
Old 05-27-2011, 07:45 PM   #7
geronimo81
Scooby Specialist
 
Member#: 154586
Join Date: Jul 2007
Chapter/Region: BAIC
Location: San Ramon
Vehicle:
1996 Turbo Outback
9psi on 91 No EM

Default

Quote:
Originally Posted by dazzyb View Post
Like others said, check the oil. I just ignored the intermittent oil light on our 2005 Outback and just blew the engine when I red lined it. That lack of paying attention is going to cost me approx $5k...
Oil light comes on after damage is done. Check your oil every week and you won't have this problem. Ignoring the oil light....bad juju
geronimo81 is offline   Reply With Quote
Old 05-27-2011, 07:57 PM   #8
toehead
Scooby Newbie
 
Member#: 268638
Join Date: Dec 2010
Location: Braintree, MA
Vehicle:
2002 WRX
Blue

Default

Is it worse when cold? My motor (and every other wrx of my year that i've heard) sounds just like that when cold.
toehead is offline   Reply With Quote
Old 05-27-2011, 11:17 PM   #9
kundziu
Scooby Newbie
 
Member#: 283973
Join Date: May 2011
Default

In my case the car is brand new, I've check the oil and it's fine. The noise is only at 2000 rpm and under very light throttle input in any gear (hot or cold). More then a quarter throttle input or idle and the noise disappears. I have a service appointment tomorrow regarding this issue. I'll let you know what Subaru says.
kundziu is offline   Reply With Quote
Old 05-27-2011, 11:39 PM   #10
GEE-OTTO
Scooby Specialist
 
Member#: 201277
Join Date: Jan 2009
Chapter/Region: MAIC
Location: Arlington VA
Vehicle:
2009 Legacy GT
OBP

Default

oil light is useless on these cars I have no idea why they even have them installed when the light comes on it is a light to indicate you probably will be buying a new engine soon b/c the current one is/is about to blow. Its new so stick to the dealer like they stick to you :lo:
GEE-OTTO is offline   Reply With Quote
Old 05-28-2011, 01:05 PM   #11
Bruins1982
Scooby Newbie
 
Member#: 240365
Join Date: Mar 2010
Chapter/Region: NESIC
Location: MA
Vehicle:
2011 WRX Premium
Sedan WRB

Default

Quote:
Originally Posted by kundziu View Post
In my case the car is brand new, I've check the oil and it's fine. The noise is only at 2000 rpm and under very light throttle input in any gear (hot or cold). More then a quarter throttle input or idle and the noise disappears. I have a service appointment tomorrow regarding this issue. I'll let you know what Subaru says.
That's the exact same symptoms as my mother's. I will go over to her house today to check the oil. Please let me know what Subaru says.

EDIT: I checked the oil and it's completely fine.

Last edited by Bruins1982; 05-29-2011 at 12:42 PM.
Bruins1982 is offline   Reply With Quote
Old 05-29-2011, 10:53 AM   #12
jj_carvell
Scooby Newbie
 
Member#: 284153
Join Date: May 2011
Default

I have an 09 impreza sport and in the winter at 83k I got the rod knock / piston pin noise. 2000 rpm in nuetral, or going down the road under light load, step on it ,it goes away. I took it in and the mech said he didn't even get to the door and he heard it. They also said they didn't check to see where it was coming from, didn't use a stethescope nothing. I have been working on and around cars and shops for 13 yrs now and it sounds to me like his work order was "just another motor problem" and he new he didn't have to check anything, because it has the same ole problem. I did every oil change on time myself, I worked at a carquest at the time so I have oil there whenever need it and don't miss them. Now because I don't have records in the dealers computer and was told "its law to have a licenced tech do it and sign the book" it is quite the headache to try and track down the missing receipts from your scam artist ex-boss and lic mechs who worked on it. I had a wheel bearing put in at 60k at the dealer and THEY didn't sign anything in any book anywhere. I speciffically asked if I would void the warranty doing the oil myself when I bought it, and the salesman looked right back at me and said "you can do them yourself", now they give me some bs fake law speech to avoid warranty on their newest cheap, poor design??? I have 2 neighbors with 08+ non turbos and both of them went just before 100k (warranty limit)
jj_carvell is offline   Reply With Quote
Old 05-29-2011, 05:47 PM   #13
kundziu
Scooby Newbie
 
Member#: 283973
Join Date: May 2011
Default

My local Subaru had my car for about 6 or 7 hours doing a diagnosis. They checked everything - and even though the mechanic who went for a ride with me agreed that he heard the noise, couldn't find anything wrong with the car. I have to point out that although the noise is similar to the one in the video, its actually much quieter and to be quite honest no one would of noticed it if it wasn't my obsessive tendencies (I work as an aerospace design engineer and do alot of work with interior cabin acoustics). The car now has 1500 km on it and the mechanic said not to worry about it, "keep breaking the car in as gently as I have been and we will address it again at the first major service" (8000 km). My guess is he's hoping the noise will disappear with the engine break in as do alot of weird new car noises. However, I feel like the noise will obviously still be present and I told him if it doesn't disappear I'll take it to a bigger Subaru dealer who can make it disappear.

The diagnosis was performed this Saturday, and because they've never dealt with this issue (I bet some people don't even notice), he did say he will be calling into the "Subaru tech line" on Monday and getting back to me once they advise him on what it could be. I'm having a hard time believing that this type of noise isn't noticed and that NO dealership has dealt with this before. Obviously it takes one post on this nerd forum to realize that there's many of us with the exact same issue. I'll update with what he tells me tomorrow after calling the "tech line".
kundziu is offline   Reply With Quote
Old 05-30-2011, 04:35 PM   #14
Bruins1982
Scooby Newbie
 
Member#: 240365
Join Date: Mar 2010
Chapter/Region: NESIC
Location: MA
Vehicle:
2011 WRX Premium
Sedan WRB

Default

Quote:
Originally Posted by kundziu View Post
My local Subaru had my car for about 6 or 7 hours doing a diagnosis. They checked everything - and even though the mechanic who went for a ride with me agreed that he heard the noise, couldn't find anything wrong with the car. I have to point out that although the noise is similar to the one in the video, its actually much quieter and to be quite honest no one would of noticed it if it wasn't my obsessive tendencies (I work as an aerospace design engineer and do alot of work with interior cabin acoustics). The car now has 1500 km on it and the mechanic said not to worry about it, "keep breaking the car in as gently as I have been and we will address it again at the first major service" (8000 km). My guess is he's hoping the noise will disappear with the engine break in as do alot of weird new car noises. However, I feel like the noise will obviously still be present and I told him if it doesn't disappear I'll take it to a bigger Subaru dealer who can make it disappear.

The diagnosis was performed this Saturday, and because they've never dealt with this issue (I bet some people don't even notice), he did say he will be calling into the "Subaru tech line" on Monday and getting back to me once they advise him on what it could be. I'm having a hard time believing that this type of noise isn't noticed and that NO dealership has dealt with this before. Obviously it takes one post on this nerd forum to realize that there's many of us with the exact same issue. I'll update with what he tells me tomorrow after calling the "tech line".
Thanks a lot for the detailed update. I appreciate it.
Bruins1982 is offline   Reply With Quote
Old 06-20-2011, 09:23 PM   #15
kundziu
Scooby Newbie
 
Member#: 283973
Join Date: May 2011
Default

I'm taking it to a much bigger dealership that's actually closer to me. Appointment is on Saturday morning. I'm not accepting "this is normal" as a disposition to the problem. The larger dealership assures me they will get to the bottom of it (they also see a potential long term service customer starting at only 2000 km in).
kundziu is offline   Reply With Quote
Old 06-22-2011, 10:07 PM   #16
grimace09
Scooby Newbie
 
Member#: 183798
Join Date: Jul 2008
Chapter/Region: MAIC
Location: Pittsburgh, PA
Vehicle:
2009 impreza 2.5i
spark silver

Default

mine blew at 35799 for an 09 impreza 2.5i oil was fine no sludge in engine and subaru was still giving me a hard time about warranty it esp bc i do oil changes my self and had no recipts after they did the tear down they pulled another bs statement and said they had to check the computer to see if it was over revved. when they said this i told them no way it has a rev limiter and if they wanna give me nemore bs ill file a claim with soa and get a lawyer involved aginst the dealership. 5 mins later they called back and said its under warranty and i need a new short block.

that was last wed and they said by the end of this week early next week itll be done!
grimace09 is offline   Reply With Quote
Old 06-23-2011, 01:56 PM   #17
JohnM10
Scooby Newbie
 
Member#: 244231
Join Date: Apr 2010
Chapter/Region: NESIC
Location: Providence, RI, USA
Vehicle:
2006 Impreza 2.5i 5M
Crystal Grey Metallic

Default

I'm glad they are covering the engine, grimace09.
You didn't state if you have a 5-spd, but just an FYI, it is very easy to over-rev an engine by downshifting to the wrong gear at a very high speed. The rev-limiter will not help in this situation.

John
JohnM10 is offline   Reply With Quote
Old 06-29-2011, 08:51 AM   #18
scuba7183
Scooby Newbie
 
Member#: 284482
Join Date: Jun 2011
Location: Rochester, NY
Vehicle:
2011 Outback Sport
Sage Green Metallic

Default

kundziu, what was the result of your service? My car does the exact same thing (2011 outback sport) except more noticable
scuba7183 is offline   Reply With Quote
Old 06-29-2011, 10:34 AM   #19
thegonz
Scooby Newbie
 
Member#: 180208
Join Date: May 2008
Chapter/Region: Tri-State
Location: new york
Vehicle:
2008 DGM 2.5i sedan
96 leggy wagon ls

Default

i have an 08 with 32k on it with modifications and the only time i ever hear a knock was when it was cold.

my wagon knocks but it has 146k on it ha
thegonz is offline   Reply With Quote
Old 06-29-2011, 09:06 PM   #20
subi2.5i
Scooby Specialist
 
Member#: 236778
Join Date: Jan 2010
Chapter/Region: Tri-State
Location: Rhinebeck,NY
Vehicle:
08 Impreza
SWP

Default

I'm curious to know what happened also!
subi2.5i is offline   Reply With Quote
Old 06-29-2011, 11:08 PM   #21
ortag49
Scooby Newbie
 
Member#: 206899
Join Date: Mar 2009
Location: vancouver bc
Vehicle:
2009 wrx
pearl white

Default

I own a 2009 Impreza, at 21000k (miles) I had a main bearing spin on me. sounded very similar to this before it did so. They ended up having to put a new short block in. Runs great now. Have put about 24000k on it since they did the work.
ortag49 is offline   Reply With Quote
Old 09-06-2011, 05:22 PM   #22
Dabrador
Scooby Newbie
 
Member#: 267790
Join Date: Dec 2010
Chapter/Region: MWSOC
Location: Cincinnati
Vehicle:
2011 Outback Sport
Silver

Default

Just found this thread...

I have a '11 OBS and started hearing the EXACT same knocking sound under the EXACT same conditions (light load, under 2k RPM).

Was there any resolution to your problem?
Dabrador is offline   Reply With Quote
Old 09-07-2011, 01:07 PM   #23
fpshked
Scooby Newbie
 
Member#: 289492
Join Date: Jul 2011
Default

I have a 2011 and it runs fine... Thank God!
fpshked is offline   Reply With Quote
Old 09-07-2011, 02:59 PM   #24
njtank
Scooby Specialist
 
Member#: 271657
Join Date: Jan 2011
Chapter/Region: Tri-State
Location: Dirty Jersey
Vehicle:
2005 Legacy GT

Default

i have this same problem. i have a 2011 2.5i 5spd. took it to Subaru World of Newton just last week they looked at it for a 5 hrs and told me that all of them make the same sound and said i was more then welcome to drive a brand new one and i would hear the same sound. i took the dealer car for a drive and sure enough it made the same sound. still a little worried about it but not to worried since i haven't done anything engine wise and i get my oil changed at the dealership.
njtank is offline   Reply With Quote
Old 09-07-2011, 04:20 PM   #25
Custom Trendz Inc.
Scooby Newbie
 
Member#: 266494
Join Date: Dec 2010
Default

Probably the valves making noise. My 97 legacy does it. I would be pissed if my brand new subaru made that noise too, but hey what can we do.
Custom Trendz Inc. 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
Very faint ticking/knocking sound at low RPM under load Dr. Ninja Factory 2.0L Turbo Powertrain 94 05-06-2013 07:30 PM
Grinding sound at low RPM? xjordanx General Community 2 08-31-2006 05:32 PM
Whining sound at low RPM trickniner Factory 2.0L Turbo Powertrain 1 05-09-2006 11:28 AM
Chirp sound at low rpm? PlatinumDan Service & Maintenance 1 04-29-2006 08:38 AM
Do you have wired sound at low RPM??(not not-enough torque) shinjyo Engine Management & Tuning 5 09-24-2005 11:07 PM


All times are GMT -4. The time now is 05:51 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.