Welcome to the North American Subaru Impreza Owners Club Monday November 24, 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 > Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo)

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 11-14-2012, 06:41 PM   #1
Viral E
Scooby Newbie
 
Member#: 242246
Join Date: Mar 2010
Chapter/Region: RMIC
Location: Montana + Indiana
Vehicle:
2002 Impreza WRX
WRB

Default It's time to play "Guess that Sound"!

So after a good solid afternoon of searching NASIOC for WRXs of my model year with similar conditions, I came to the conclusion that my sound was at least different enough to justify a separate thread. If this is an easy answer and I simply overlooked something, well... I tried.

I got into my car one morning two months ago, started it up, and finished my phone call as I began to buckle up. When all of a sudden...



Conditions of the symptom:
- 2002 WRX - 170K miles - Original engine, no rebuild
- Ambient Temperature: Both Cold and Hot (-10 F to 80 F)
- Duration: A little more prominent at start-up but still present after complete warm-up (Intensity is reduced perhaps 10-20% after warm up)
- Sound matches RPM's almost exactly (1 sound per RPM or 1 sound per 2 RPM)
- Most audible at idle in gear and neutral with clutch both in and out, but slightly more audible under load when accelerating from 750-1800 RPM's then falls off quickly after that
- Tone is incident to a small knocking sound almost like a clicking
- Sound appears to be coming from driver's side (90% certain)
- Sound appears to be coming from front of engine (50% certain)
- Sound is barely audible and you wouldn't notice it unless you were listening for it like I was. Once you hear it though, it is distinct enough to catch every time it happens.
Given the symptoms I've compiled a list of possibles, some of which are much more likely than others:

Rod Knock
Bearing failure (perhaps one of the journals?)
Idler pulley
Loose Bolt
Bad Alternator (Bearing or pulley)
Bad AC Belt Tensioner
Piston Slap
Engine Knock

Unfortunately I can't just tear apart my engine on a whim, nor can I afford to have a shop tear it apart without being absolutely certain of what I'm getting into (to put it bluntly, I'm broke, in between a rock and a hard place, with no way out). Suggestions would be most appreciated or even things I didn't consider. I'm working on getting a logging cable so I can check AFR's soon to make sure engine knock isn't a possibility.
* Registered users of the site do not see these ads.
Viral E is offline   Reply With Quote
Old 11-14-2012, 06:50 PM   #2
rocketperson7
Scooby Newbie
 
Member#: 283968
Join Date: May 2011
Chapter/Region: MWSOC
Location: Fort Wayne, IN
Vehicle:
2003 WRX
MBP

Default

sounds like lifter tick, you have solid lifters, it happens
rocketperson7 is offline   Reply With Quote
Old 11-14-2012, 06:52 PM   #3
wrxlaunch
Scooby Specialist
 
Member#: 181298
Join Date: May 2008
Chapter/Region: MAIC
Location: MD
Vehicle:
99 SF

Default

How is the maintenance of the car...up to date?, which oil do you use, have you checked the compression?
wrxlaunch is offline   Reply With Quote
Old 11-14-2012, 07:15 PM   #4
420WRX
Scooby Specialist
 
Member#: 27752
Join Date: Oct 2002
Chapter/Region: VIC
Location: Victoria B.C., Can
Vehicle:
2004 WRX+Ver.8 EJ207
Silver

Default

You need to make a clip, like this:
http://soundkey.com/index.php?option...id=62&autoplay

(Funny that the first upload of an engine problem sounds exactly like a WRX with exhaust mods??)

For me this was play in the crank bearing/spun crank bearings, apparently a common woe for this car/motor.

It started off pretty subtle and got very loud without much driving.

When it was subtle I could keep it away by keeping the engine under load and once the RPMs were up it'd die off.. only to return as I'd let the engine load drop and the RPMs dropped.

I have a video I recorded of it on my camera if needed?
420WRX is offline   Reply With Quote
Old 11-14-2012, 07:27 PM   #5
Viral E
Scooby Newbie
 
Member#: 242246
Join Date: Mar 2010
Chapter/Region: RMIC
Location: Montana + Indiana
Vehicle:
2002 Impreza WRX
WRB

Default

Car originally had Mobil 1 used for nearly 60K miles before I got it, and i started using Rotella T6 (5w-40) when I got it, HOWEVER the noise started before I switched to T6. I have the Carfax and according to it, the car was in an accident around 95K but I'm unsure of the extent of the damage. Nothing in the block was replaced (I know that).

All other maintenance is indeed up-to-date, and compression is good in all cylinders sitting around 156-160 for all four of them.

EDIT: Listened to your sound clip and mine sounds absolutely nothing like that. It's WAY softer and much less "booming". Rather, mine is more like a click... but not high-pitched.

Last edited by Viral E; 11-14-2012 at 10:02 PM.
Viral E is offline   Reply With Quote
Old 11-15-2012, 01:50 PM   #6
420WRX
Scooby Specialist
 
Member#: 27752
Join Date: Oct 2002
Chapter/Region: VIC
Location: Victoria B.C., Can
Vehicle:
2004 WRX+Ver.8 EJ207
Silver

Default

Quote:
Originally Posted by Viral E View Post
EDIT: Listened to your sound clip and mine sounds absolutely nothing like that. It's WAY softer and much less "booming". Rather, mine is more like a click... but not high-pitched.
Sorry that was posted as an example, not my clip at all, I was just wondering if there's any good sound clip sites to link to and then found an engine noise clip so that was perfect.
420WRX is offline   Reply With Quote
Old 11-15-2012, 02:01 PM   #7
420WRX
Scooby Specialist
 
Member#: 27752
Join Date: Oct 2002
Chapter/Region: VIC
Location: Victoria B.C., Can
Vehicle:
2004 WRX+Ver.8 EJ207
Silver

Default

This clip is VERY close to the sound I had:
https://www.youtube.com/watch?v=SvxaR7HSmWc
(Especially the 'clack' sound as he comes off the throttle, that's tell-tale)

This clip is a good example of a similar sound caused by a tensioner:
https://www.youtube.com/watch?v=UmZ1F8V8pc8
420WRX is offline   Reply With Quote
Old 11-15-2012, 02:10 PM   #8
Viral E
Scooby Newbie
 
Member#: 242246
Join Date: Mar 2010
Chapter/Region: RMIC
Location: Montana + Indiana
Vehicle:
2002 Impreza WRX
WRB

Default

Listening to these clips you're posting, I almost feel guilty for even mentioning my sound. Mine is barely audible compared to those massive clackings and clankings. It's a VERY light knock. I'll post a sound clip as soon as I can. I just have trouble getting my hands on good recording equipment (I've got an archaic cellphone so that one is out)
Viral E is offline   Reply With Quote
Old 11-15-2012, 02:18 PM   #9
420WRX
Scooby Specialist
 
Member#: 27752
Join Date: Oct 2002
Chapter/Region: VIC
Location: Victoria B.C., Can
Vehicle:
2004 WRX+Ver.8 EJ207
Silver

Default

It's good! You really don't want the sound that's in the first video.. I'm still paying for that one as you could probably guess from my 'vehicle' info.
420WRX is offline   Reply With Quote
Old 11-15-2012, 02:28 PM   #10
jaysh
Scooby Specialist
 
Member#: 133200
Join Date: Nov 2006
Chapter/Region: SCIC
Location: Simi Valley, CA
Vehicle:
2013 STi Limited
SWP

Default

jaysh 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 10:12 AM.


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.