Welcome to the North American Subaru Impreza Owners Club Tuesday September 23, 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 12-01-2003, 10:32 AM   #1
NicEJ25
Scooby Specialist
 
Member#: 26155
Join Date: Oct 2002
Chapter/Region: E. Canada
Location: Levis,qc,ca
Vehicle:
2008 WRX 5dr
Dark Grey

Default help, undriveable! problem solved...

My 2.5 is giving me headaches these days. before the weekend, it started jerking when driving at steady speeds. then now it does that whenener there's no real load. if i'm flooring it, it will accelerate normally, but as soon as it get near from steady speed. it will jerk. if I push the clutch when it's jerking. it will stall for sure. it seem to be very rich. I changed the 02 sensor. nothing happened. I unplugged the TPS, nothing happened. disabled the fuel pressure regulator near the engine (still using the one near the tank), nothing happened. Fried ECU ? please help !
* Registered users of the site do not see these ads.

Last edited by NicEJ25; 12-08-2003 at 03:46 PM.
NicEJ25 is offline   Reply With Quote
Old 12-01-2003, 01:39 PM   #2
1 Lucky Texan
Scooby Specialist
 
Member#: 46320
Join Date: Oct 2003
Chapter/Region: TXIC
Location: Outoftheblue&intotheblack
Vehicle:
06 WRX Sportwagon
Aspen White

Default

I've read that this can sometimes be a temp. sensor. Basically the ECU thinks the car is cold and pumps too much fuel into the system.

Carl
1 Lucky Texan
1 Lucky Texan is offline   Reply With Quote
Old 12-01-2003, 01:57 PM   #3
NicEJ25
Scooby Specialist
 
Member#: 26155
Join Date: Oct 2002
Chapter/Region: E. Canada
Location: Levis,qc,ca
Vehicle:
2008 WRX 5dr
Dark Grey

Default

are you talking about too much fuel (rich) or way too much fuel (drowning to death) ??

where is located the engine temperature sensor ?

Last edited by NicEJ25; 12-01-2003 at 05:40 PM.
NicEJ25 is offline   Reply With Quote
Old 12-01-2003, 06:03 PM   #4
munkis
Scooby Guru
 
Member#: 1847
Join Date: Jul 2000
Chapter/Region: Tri-State
Location: brokenmotorsports.com
Vehicle:
Team Broken: V6 GF
rallyarmor.com

Default

spark plug wires
munkis is offline   Reply With Quote
Old 12-01-2003, 06:17 PM   #5
scoobiejosh
Scooby Specialist
 
Member#: 3139
Join Date: Dec 2000
Chapter/Region: RMIC
Location: SLC Utah
Vehicle:
2001 Dodge Pikumup
& 08 Triumph Speed Triple

Default

I am 99.9% sure it is your first O2 sensor. Try unplugging it and see if the car behaves any better. I say this from experience. The RS uses the first O2 sensor for partial throttle closed loop operations. When it goes open loop near full throttle it does not use that sensor anymore.
scoobiejosh is offline   Reply With Quote
Old 12-01-2003, 07:31 PM   #6
NicEJ25
Scooby Specialist
 
Member#: 26155
Join Date: Oct 2002
Chapter/Region: E. Canada
Location: Levis,qc,ca
Vehicle:
2008 WRX 5dr
Dark Grey

Default

the new one is there actually. and it did not changed anything. even unplugged, i would not change a thing. when the car is cold, it's ok (temp around freezing point here). after a minute or do, it will start jerking, wich make me think the temp sensor is the next thing to check.
NicEJ25 is offline   Reply With Quote
Old 12-01-2003, 08:45 PM   #7
Keith Cournoyer
Scooby Newbie
 
Member#: 16764
Join Date: Mar 2002
Location: Somerville, MA
Default ndrivability

Hey, just a thought, my car drove behaved similar with a malfunctioning knock sensor and 2nd O2 sensor shot. Are you pulling CEL codes?
Good Luck, Keith
Keith Cournoyer is offline   Reply With Quote
Old 12-01-2003, 11:26 PM   #8
Ahzlon
Scooby Specialist
 
Member#: 45216
Join Date: Oct 2003
Chapter/Region: NESIC
Location: Essex, Vermont
Vehicle:
2005 Baja Turbo
Silver

Default

well i realize this was on an older bronco.. but my coolent temp sensor made my 351W go abloslutely bannanas... high revs.. herky jerky acceleration.. try replacing that.. usualy a really cheap fix.. and the computer would never throw a CEL either.. and my gas milage went to crap too.. might wanna check that
Ahzlon is offline   Reply With Quote
Old 12-02-2003, 11:59 AM   #9
NicEJ25
Scooby Specialist
 
Member#: 26155
Join Date: Oct 2002
Chapter/Region: E. Canada
Location: Levis,qc,ca
Vehicle:
2008 WRX 5dr
Dark Grey

Default

I hope i'll find time and help to install my OBD2 plug this week-end. then i'll read the code.
NicEJ25 is offline   Reply With Quote
Old 12-08-2003, 03:58 PM   #10
NicEJ25
Scooby Specialist
 
Member#: 26155
Join Date: Oct 2002
Chapter/Region: E. Canada
Location: Levis,qc,ca
Vehicle:
2008 WRX 5dr
Dark Grey

Default

I didn't had time to wire my OBD2 plug yet, but I found the problem. Since I've changed rear fuel lines for hose (because of leaking rusted lines), my car was going bad. well, it was since I changed the last small return line. in fact. MY01 fuel pump cover have 3 hoses connector. MY93 had only 2. I assumed there was a Y to join both return line. I was damn wrong. In fact, the MY93 tank small return line connector is somewhere in the middle, unreacheable from both opening. So, this morning, in the last attemp to make my car run well, I put a Y on the small return line under the round opening, and connected the small return line to both old tank connector, and MY01 fuel pump cover connector. Then, no jerk, no stalling, nothing bad. In fact, in jerked once. I make my discover my tank was empty (my guage isn't working yet). so, if you have a leak in your tank, or a restricted return, you're most likely to get jerk, stall, and impressive 175 km out of a 50L tank. 25L per 100 km, or 8 mpg...
NicEJ25 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
Need Turbo Help!!!!!! 07subywrxtr Factory 2.5L Turbo Powertrain 6 06-05-2010 03:52 AM
HELP HELP HELP Need help diagnosing a clutch problem.... redoktober_99 Tri-State Area Forum 9 02-06-2007 10:28 PM
Help Help Help Help Diehard Factory 2.5L Turbo Powertrain 8 11-08-2006 03:42 PM
idle hesitation, undriveable 20g 05 lgt wichitalegacy Factory 2.5L Turbo Powertrain 31 09-29-2006 08:44 PM
light weight/undrive pullies,do they work??? subrandon Factory 2.0L Turbo Powertrain 6 11-15-2004 03:54 PM


All times are GMT -4. The time now is 04:55 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.