Welcome to the North American Subaru Impreza Owners Club Friday November 28, 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 2.5L Turbo Powertrain (EJ Series Factory 2.5L 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 01-16-2008, 03:02 PM   #1
bzbuzz
Scooby Specialist
 
Member#: 116052
Join Date: May 2006
Chapter/Region: MWSOC
Location: IL 수바루!
Vehicle:
2011 STI ( Sold )
WRB

Default Bucking or Jerking problem on my 06 wrx

I don't know if this problem is drivetrain related or engine related so I just post it in here...

My 06 wrx is stage2 protuned w/ sti TMIC + GM boost solenoid + spt intake..
I have a lot of bushings installed(almost everything you can find in TIC) including grp n engine + tranny mounts..

I have a bucking/jerking issue when WOT specially in 2nd gear. In 5~6k rpm as soon as I let off the gas pedal, my car bucks or jerks( I don't know if this term is rite to describe my problem), car instantly moves back and forth w/ some kinda boom sound...I can't duplicate the problem when I just increase rpm to high w/o turbo kicks in..it only happens when WOT. But funny thing is tho that it doesn't do it all the time..big time intermittent..I've noticed 3rd gear does same thing but not hard as 2nd gear...almost not noticeble..

I don't recall when exaxtly this started to happen... but I guess when I replaced the stock pitch stop w/ kartboy one...that was when I firstly noticed..but then I put the stock one back in...the problem's still there....

the enigima is this problem doesn't happen all the time...so...wierd..

anybody has same issue? any advice?
* Registered users of the site do not see these ads.
bzbuzz is offline   Reply With Quote
Old 01-16-2008, 03:06 PM   #2
ringe
Scooby Specialist
 
Member#: 49998
Join Date: Dec 2003
Chapter/Region: RMIC
Vehicle:
2007 WRX CT Stg 2
WRB

Default

You said you had a bunch of bushings installed, including engine/tranny...I'd check your fasteners out. Just a thought, maybe a wind-goose chase, but I'd just go back and double-check all the work you've done.
ringe is offline   Reply With Quote
Old 01-16-2008, 03:15 PM   #3
bzbuzz
Scooby Specialist
 
Member#: 116052
Join Date: May 2006
Chapter/Region: MWSOC
Location: IL 수바루!
Vehicle:
2011 STI ( Sold )
WRB

Default

Besides checking bushings...anything else I could check tho? something related to engine or tranny? funny...I just went out for lunch...and tried WOT on 2nd gear....it didn't happen...boo...it will come back tho...
bzbuzz is offline   Reply With Quote
Old 01-16-2008, 03:17 PM   #4
ringe
Scooby Specialist
 
Member#: 49998
Join Date: Dec 2003
Chapter/Region: RMIC
Vehicle:
2007 WRX CT Stg 2
WRB

Default

I'm not super knowledgeable about the GM solenoid mod or what it could impact if it FUBARed, so I can't off much else, sorry.
ringe is offline   Reply With Quote
Old 01-16-2008, 04:14 PM   #5
bzbuzz
Scooby Specialist
 
Member#: 116052
Join Date: May 2006
Chapter/Region: MWSOC
Location: IL 수바루!
Vehicle:
2011 STI ( Sold )
WRB

Default

let me list what i've done:

grp n engine + tranny mount + pitch stop
crossmember bushing
kartboy ss + both bushings
outrigger bushing
rear diff bushing
whiteline steering rack bushing
whiteline rear subframe lock bolt
whiteline ALK comfort
whiteline 27mm adj f + 24mm adj r sways
kartboy endlink front whiteline endlink rear
tokico d-spec + rce v2 yellow spring + grp n tophats
bzbuzz is offline   Reply With Quote
Old 01-17-2008, 11:08 AM   #6
bzbuzz
Scooby Specialist
 
Member#: 116052
Join Date: May 2006
Chapter/Region: MWSOC
Location: IL 수바루!
Vehicle:
2011 STI ( Sold )
WRB

Default

anybody else?
bzbuzz is offline   Reply With Quote
Old 01-17-2008, 11:25 AM   #7
SamTodd
Scooby Newbie
 
Member#: 142185
Join Date: Feb 2007
Default

Don't let your foot off so quick, do it more softly. my car kind of does it when i let off @ wot too quick, Its like you're goign wot and your motor is asking for tons of fuel and air, but then you slam it off the throttle and it closes and slighyly still wants more fuel and air . kind of like, when you close a door and slam a door, door slam causes the house to shake and loud noises.


drivebywire sucks
SamTodd is offline   Reply With Quote
Old 01-17-2008, 11:42 AM   #8
rhinotech
Scooby Specialist
 
Member#: 144880
Join Date: Mar 2007
Chapter/Region: TXIC
Location: Cajun Country
Vehicle:
03 Civic
Rollin' hard...

Default

How does your clutch feel? That "bucking" sensation could come from your clutch getting worn.. Most likely just a harsh jerking from being set back on the gear teeth and when WOT and you release it jerks it forward (play tolerance between the teeth) and going from back on the teeth to deceleration on the teeth.

I don't really know how to word it unless we were in person talking about it.. I hope that makes a little sense.
rhinotech is offline   Reply With Quote
Old 01-17-2008, 05:33 PM   #9
ExpO
*** Banned ***
 
Member#: 115819
Join Date: May 2006
Chapter/Region: Tri-State
Location: UDel, illidelphia
Vehicle:
2006 vf39 R0mRa1DeR
Darknessess Wagon

Default

Probably not the issue, but I've had similar experiences with a loose pitch stop.

I would check over all the drivetrain mounts and make sure everything is tight.

Either way, avoid doing whatever you're doing to make the noise, especially with a stock 06 tranny.
ExpO is offline   Reply With Quote
Old 01-17-2008, 11:34 PM   #10
boogieboogz
Scooby Newbie
 
Member#: 147838
Join Date: May 2007
Chapter/Region: Tri-State
Location: NJ
Vehicle:
2007 WRX Limited
CGM

Default

I got the same problem on my car..and mine's pretty stock. it's been doin it since I got the car new. I've driven a bunch of MT cars and they never really did that unless you drive like a dumbass. mine happens mostly in 2nd at WOT goin uphill or just letting off the gas it'll start bogging. maybe this is an AWD thing? I don't know. I just hope it's not the clutch. I granny shift most of the time and rarely even rip my ****.
boogieboogz is offline   Reply With Quote
Old 01-17-2008, 11:43 PM   #11
mugenXP
*** Banned ***
 
Member#: 155272
Join Date: Jul 2007
Chapter/Region: SCIC
Location: SoCal
Vehicle:
2006 WRX
Panda AE86

Default

my car does this as well, and i know a few others that do it also. the faster you cut off throttle, the more it'll "buck", if you let it off in a smoothe motion, it won't be as bad.
mugenXP is offline   Reply With Quote
Old 01-18-2008, 12:02 AM   #12
scargo06
Scooby Newbie
 
Member#: 119506
Join Date: Jul 2006
Chapter/Region: Tri-State
Location: NJ
Vehicle:
06 tr
sgm

Default

Don't let your foot off so quick, do it more softly. my car kind of does it when i let off @ wot too quick, Its like you're goign wot and your motor is asking for tons of fuel and air, but then you slam it off the throttle and it closes and slighyly still wants more fuel and air . kind of like, when you close a door and slam a door, door slam causes the house to shake and loud noises.


drivebywire sucks[/quote]


^^Yeah what he said.
scargo06 is offline   Reply With Quote
Old 01-18-2008, 12:07 AM   #13
ExpO
*** Banned ***
 
Member#: 115819
Join Date: May 2006
Chapter/Region: Tri-State
Location: UDel, illidelphia
Vehicle:
2006 vf39 R0mRa1DeR
Darknessess Wagon

Default

DBW sucks? Get real.

The stock throttle mapping sucks, but that doesn't mean dbw sucks.

Also, any time you let off the throttle at WOT, you should be clutching in. If you're not, thats exactly why its bucking, it isn't your grandma's automatic.
ExpO is offline   Reply With Quote
Old 01-18-2008, 12:38 PM   #14
bzbuzz
Scooby Specialist
 
Member#: 116052
Join Date: May 2006
Chapter/Region: MWSOC
Location: IL 수바루!
Vehicle:
2011 STI ( Sold )
WRB

Default

Quote:
Originally Posted by ExpO View Post
DBW sucks? Get real.

The stock throttle mapping sucks, but that doesn't mean dbw sucks.

Also, any time you let off the throttle at WOT, you should be clutching in. If you're not, thats exactly why its bucking, it isn't your grandma's automatic.
well it happens even if i clutch in...
bzbuzz is offline   Reply With Quote
Old 01-18-2008, 01:45 PM   #15
RiftsWRX
Scooby Guru
 
Member#: 6124
Join Date: Apr 2001
Chapter/Region: MWSOC
Location: Glendale Hts, IL, USA
Vehicle:
2000 NFR AP1 S2000
'07 Honda FIT sport (5MT)

Default

Quote:
Originally Posted by bzbuzz View Post
well it happens even if i clutch in...
I can always check to see that it isn't anything on the EMS side. Possible you caused a vacuum or boost leak on your installs?

Jorge (RiftsWRX)
www.ProjectWRX.com
RiftsWRX is offline   Reply With Quote
Old 01-18-2008, 02:00 PM   #16
boogieboogz
Scooby Newbie
 
Member#: 147838
Join Date: May 2007
Chapter/Region: Tri-State
Location: NJ
Vehicle:
2007 WRX Limited
CGM

Default

nah, even when I'm cruisin in gear..no clutch no gas, it still bogs. mostly either at low rpms or high rpms in 2nd gear.
boogieboogz is offline   Reply With Quote
Old 01-20-2008, 04:24 AM   #17
osuRexWagon
Scooby Newbie
 
Member#: 130559
Join Date: Oct 2006
Chapter/Region: NWIC
Location: Beaverton, OR
Vehicle:
2009 WRB WRX 5dr

Default

I think I was having the same issue tonight with my 06 wrx wagon. I first noticed it when I was in cruise control in 5th gear at about 3k rpm. I took it off cruise and pushed the gas pedal all the way down... and... NOTHING! it stayed at around 3k rpm... I downshifted to fourth, and took off now problem. Back into 5th gear... stays at 3k rpm. Went to happy hour, came back out and expected everything to be ok, maybe I didn't let it warm up enough.... same problem, only it BUCKS in lower gears too, almost like the motor is hesitating!

I'm taking this into the dealership to look at ASAP... I'll keep you guys updated if they're able to fix it. Let me know if you find anything out on your end also.

P.S. I have a cat back and everything else is stock except for silencer delete
osuRexWagon is offline   Reply With Quote
Old 01-20-2008, 05:11 AM   #18
mugenXP
*** Banned ***
 
Member#: 155272
Join Date: Jul 2007
Chapter/Region: SCIC
Location: SoCal
Vehicle:
2006 WRX
Panda AE86

Default

Quote:
Originally Posted by boogieboogz View Post
nah, even when I'm cruisin in gear..no clutch no gas, it still bogs. mostly either at low rpms or high rpms in 2nd gear.

wrx's aren't the only cars that do this.
mugenXP is offline   Reply With Quote
Old 01-20-2008, 10:10 AM   #19
tux121
Scooby Specialist
 
Member#: 162942
Join Date: Oct 2007
Location: MN
Vehicle:
2006 STi Black&Gold
Stage 2

Default

So this is just 2nd gear huh? It shall be the tranny then.
tux121 is offline   Reply With Quote
Old 01-20-2008, 12:34 PM   #20
bzbuzz
Scooby Specialist
 
Member#: 116052
Join Date: May 2006
Chapter/Region: MWSOC
Location: IL 수바루!
Vehicle:
2011 STI ( Sold )
WRB

Default

Quote:
Originally Posted by tux121 View Post
So this is just 2nd gear huh? It shall be the tranny then.
nope..i said..it does on 3rd gear too..but not as noticeble as 2nd gear..

update:
I just installed ixiz pitch stop mount...and I can't duplicate the same problem so far... we will see...
bzbuzz is offline   Reply With Quote
Old 10-02-2014, 08:31 PM   #21
mschiavoni
Scooby Newbie
 
Member#: 299104
Join Date: Oct 2011
Chapter/Region: Tri-State
Location: Pittsburgh, PA
Vehicle:
1997 Legacy 2.5GT
Spruce Pearl

Default

resurrecting a dead thread. I'm having the exact same problem as op, except I have a bone stock 2014 hatchback.

WOT to no throttle, car bucks with a loud BANG! seems like it only does it when it's cold (not warmed up all the way) if that helps
mschiavoni is offline   Reply With Quote
Old 10-03-2014, 06:54 AM   #22
2Fast4U1DAY
Scooby Specialist
 
Member#: 250152
Join Date: Jun 2010
Chapter/Region: MAIC
Location: Pennsylvania
Vehicle:
2006 WRX Limited
OBP

Default

Do you have a BOV? And of course the cars going to "jerk" if you are getting off the throttle abruptly. You are going from heavy load to no load so all the weight transfer tries to "push" the vehicle

Sent from my SAMSUNG-SGH-I537 using NASIOC mobile app
2Fast4U1DAY is offline   Reply With Quote
Old 10-03-2014, 10:02 AM   #23
mschiavoni
Scooby Newbie
 
Member#: 299104
Join Date: Oct 2011
Chapter/Region: Tri-State
Location: Pittsburgh, PA
Vehicle:
1997 Legacy 2.5GT
Spruce Pearl

Default

no BOV, like I said. all stock. does that explain the bang that occurs with it? feels like a bad backfire or something
mschiavoni is offline   Reply With Quote
Old 10-03-2014, 12:49 PM   #24
2Fast4U1DAY
Scooby Specialist
 
Member#: 250152
Join Date: Jun 2010
Chapter/Region: MAIC
Location: Pennsylvania
Vehicle:
2006 WRX Limited
OBP

Default

No it doesnt. And you'd know if you had a backfire. Backfire is when combustion occurs with the intake valve open. This usually results in broken bits if it's as violent as you describe.
You are more likely experiencing afterlighting or after fire- when fuel gets pushed into the exhaust manifold and is ignited by the retained heat in the exhaust manifold.

Sent from my SAMSUNG-SGH-I537 using NASIOC mobile app
2Fast4U1DAY is offline   Reply With Quote
Old 10-03-2014, 01:06 PM   #25
mschiavoni
Scooby Newbie
 
Member#: 299104
Join Date: Oct 2011
Chapter/Region: Tri-State
Location: Pittsburgh, PA
Vehicle:
1997 Legacy 2.5GT
Spruce Pearl

Default

hmmmm. I may need to have it checked. I hardly ever go WOT, but if there's a problem with the car, I want it fixed


Sent from my iPhone using NASIOC
mschiavoni 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
Is there a way i can put on 06 sti bbs rims on my 06 wrx?? akazempoor Newbies & FAQs 14 09-25-2009 01:49 PM
I Need help on turning my day time running lights on my 06 WRX tysonbate Rocky Mountains Impreza Club Forum -- RMIC 6 09-27-2008 03:55 AM
MAJOR problem on my 02 WRX - Power Stearing and Alt nick robinson Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 8 01-08-2007 09:52 PM
stock 03 wrx cooler on my 06 wrx? meat_WRX Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 7 05-03-2006 11:18 PM
In dash dvd problem on my 04 wrx HELP! snowcrzy Car Audio, Video & Security 4 04-22-2006 02:18 AM


All times are GMT -4. The time now is 02:14 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.