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 > Factory 2.0L Turbo 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 04-01-2013, 12:57 PM   #1
six3jag
Scooby Newbie
 
Member#: 81540
Join Date: Feb 2005
Chapter/Region: TXIC
Location: Bryan, Tx
Vehicle:
02 WRX
Black

Default Engine bouce or drivetrain slack

Its been a while since i've posted but i am in need of some opinions on a problem with my aging 2002 wrx. I noticed on a high way trip that while in first gear in traffic i could no longer control the engine bounce that comes from lightly increasing the throttle at low rpms. I also notice that after engine breaking in 5th gear for a while when i come back on to the throttle a bit harder i get the same engine jerk or bounce. I have been driving this car for a long time and have never experienced this in 5th gear. I also have a bit harder of a time coming off the clutch in first now. I mean even though i have been driving this car for 9 years i have started stalling it occasionally.

My thoughts were that this is a problem with the motor mounts or transmission mount, and that my engine was winding up like a spring and then when it hits its limits of travel it suddenly unloads the stored energy into the drive train. I have never really seen this problem with anyone else on the forum though.

Is there a good test for the engine mounts?
Does anyone have any other ideas as to the cause of something like this?

Thanks.
six3jag is offline   Reply With Quote
Old 04-01-2013, 09:22 PM   #2
04wrxhart
Scooby Newbie
 
Member#: 204246
Join Date: Feb 2009
Chapter/Region: NWIC
Location: Vancouver, Wa.
Vehicle:
2004 Impreza WRX
WRBlue

Default

Pop the hood and rev the engine. If it moves a lot more then normal its probably time for new mounts
04wrxhart is offline   Reply With Quote
Old 04-02-2013, 10:04 AM   #3
art@grimmspeed
NASIOC Vendor
 
Member#: 301037
Join Date: Nov 2011
Chapter/Region: MWSOC
Location: Maple Grove, MN
Vehicle:
2004 Forester XT
Aspen White

Default

How many miles are on the car?
art@grimmspeed is offline   Reply With Quote
Old 04-02-2013, 10:34 AM   #4
six3jag
Scooby Newbie
 
Member#: 81540
Join Date: Feb 2005
Chapter/Region: TXIC
Location: Bryan, Tx
Vehicle:
02 WRX
Black

Default

there's about to be 100k on the car. I revved the engine while looking at it for excessive play. There doesnt seem to be too much movement. I would guess it rises or falls 1 inch on each side as it revs. Could be worse with a load on it.

I did notice though that it had some really bad throttle response. I don't recall specificly how quick it responded to the throttle before but if you pull the throttle quick to about a quarter or more it waits maybe half a second or so before responding. Seems like this is too slow.

I also noticed today while driving that the bounce can be brought on without a change in the power transmission direction. That is, even while continuing to accelerate if i suddenly push the throttle harder i get a hard snap to the car, and it kinda bounces like you would get in 1st gear. It does this in all gears. I am not sure where the engine gets enough torque to do this while in high gears. Seems like something is making it feel like it has a lot more torque than it should.
six3jag is offline   Reply With Quote
Old 04-02-2013, 10:59 AM   #5
Whoa!ShutItDown
Scooby Newbie
 
Member#: 191700
Join Date: Oct 2008
Chapter/Region: Tri-State
Location: Cicero, NY
Vehicle:
04 WRX
silver

Default

I used to get a nasty bucking, I couldn't tell which mounts were causing it. It was most prominent getting into 2nd, but still there in 1st and 3rd. I did group n motor mounts and that helped quite a bit. Next was a group n trans mount which was another noticable improvement, also made shifting a little nicer. I just did rear diff mount bushings last week and that seemed to help a little too. Idk which one I'd recommend doing first
Whoa!ShutItDown is offline   Reply With Quote
Old 04-02-2013, 09:25 PM   #6
Andrewxxcarlson
Scooby Specialist
 
Member#: 316415
Join Date: Apr 2012
Location: Elk Grove, CA
Vehicle:
2006 WRX
WRB

Default

Check your pitch mount, gettin to the mileage to start replacing mounts.
Andrewxxcarlson is online now   Reply With Quote
Old 10-05-2013, 12:40 PM   #7
02-wrxbugeye
Scooby Newbie
 
Member#: 316420
Join Date: Apr 2012
Location: Rochester, NY
Vehicle:
2002 WRX Wagon
WRB

Default

I am having the same problem with my 02 that's also nearing 100k miles. Hopefully it's just worn mounts.
02-wrxbugeye 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 11:42 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.