Welcome to the North American Subaru Impreza Owners Club Monday July 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 > 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 07-27-2003, 01:07 AM   #1
AustinSTi
Scooby Specialist
 
Member#: 9386
Join Date: Aug 2001
Location: H-Market, VA & JMU
Vehicle:
2000 2.5rs sedan
silverthorn

Default Hesitation/shudder problem dealing with a P0170 (fuel trim malfunction)

This does not pertain to the typical clutch shudder problem most everyone with a pre 02 RS gets, but it seems to do with the exhaust. I have a wrapped borla header, HKS sport cat back, and I recently added a Random Tech high flow cat. I put it on a month ago then went on vacation, and now pretty much in between 1500 rpm and 2800 rpm, when I try and shift driving normally it shakes like all hell to the point where it seems like I might almost stall if i dont keep it above that 2800 rpm. It also bogs heavily if the throttle is anywhere below 20 % in the 4th or 5th gear. I'm uprgrading the clutch and flywheel regardless very soon, but I doubt it will fix this problem. Has anyone encountered a similar problem after putting on a high flow cat on or possilby give me some advice on how to fix this problem.
* Registered users of the site do not see these ads.

Last edited by AustinSTi; 07-29-2003 at 07:15 PM.
AustinSTi is offline   Reply With Quote
Old 07-28-2003, 11:10 AM   #2
m750
Scooby Guru
 
Member#: 2278
Join Date: Sep 2000
Chapter/Region: NESIC
Location: Pepperell MA
Vehicle:
8Sti | 07 allez
White | Comp

Default

My car ran like crap when I had a bad 02 sensor... a new cat maybe had some stuff in it, and it caused your 02 to die?
I don't know just a guess. Always good to make sure it's not the basics... When was your last full on tune up? plugs, wires, air filter, fuel filter?
AO
m750 is offline   Reply With Quote
Old 07-28-2003, 02:23 PM   #3
AustinSTi
Scooby Specialist
 
Member#: 9386
Join Date: Aug 2001
Location: H-Market, VA & JMU
Vehicle:
2000 2.5rs sedan
silverthorn

Default

yesterday I cleaned the air filter and tommorow I'm gonna get an oil change. Not sure if that will fix it, but if is indeed a bad o2 sensor, how much will one of those cost. Isn't there some sort of o2 cel fix for the random tech as well?? where would i get that?
AustinSTi is offline   Reply With Quote
Old 07-29-2003, 01:12 AM   #4
AustinSTi
Scooby Specialist
 
Member#: 9386
Join Date: Aug 2001
Location: H-Market, VA & JMU
Vehicle:
2000 2.5rs sedan
silverthorn

Default

???
AustinSTi is offline   Reply With Quote
Old 07-29-2003, 04:41 PM   #5
m750
Scooby Guru
 
Member#: 2278
Join Date: Sep 2000
Chapter/Region: NESIC
Location: Pepperell MA
Vehicle:
8Sti | 07 allez
White | Comp

Default

air filter and oil change, unless terribly over due shouldn't cause this problem. I'll repeat my suggestion, plugs, wires, fuel filter if they haven't been done in 20 or so k. The o2 sensor isn't a bank breaker, I think it's around 125 or something. But I'd recomend you do that first, so, you are at least in proper tune.
AO
m750 is offline   Reply With Quote
Old 07-29-2003, 07:14 PM   #6
AustinSTi
Scooby Specialist
 
Member#: 9386
Join Date: Aug 2001
Location: H-Market, VA & JMU
Vehicle:
2000 2.5rs sedan
silverthorn

Default

got the cel pulled, turns out it is a P0170. I checked the CEL log thread, and it wasnt even listed. Its a fuel trim malfunction (bank 1). Anybody know what is necessary to fix this problem??
AustinSTi is offline   Reply With Quote
Old 07-29-2003, 10:36 PM   #7
Poppa smurf
Scooby Specialist
 
Member#: 8257
Join Date: Jul 2001
Chapter/Region: MAIC
Location: Washington & Frederick CO. MD
Vehicle:
2004 STI
Silver\Silver

Default

IIRC the O2 sensor is about 60 bucks check here for more info.
http://www.scoobymods.com/forums/sho...?threadid=1039

Does it sound like there are any leaks in the exhaust? if you need a shop I know where one is but its a bit of a drive. PM me if needed.
Poppa smurf is offline   Reply With Quote
Old 07-30-2003, 12:34 AM   #8
AustinSTi
Scooby Specialist
 
Member#: 9386
Join Date: Aug 2001
Location: H-Market, VA & JMU
Vehicle:
2000 2.5rs sedan
silverthorn

Default

ok, so with the P0170 (fuel trim malfunction), all I'm going to need to do is to buy a new o2 sensor?or will I need to buy a new fuel filter as well?


Hey Poppa Smurf, If it is just the o2 sensor that needs replacing, I might have to take you up on that offer for the install, and to check for leaks at the shop you know. If its MD I'll try and coordinate a date thats good for you, and for Steve (tai chih) cuz he lives up in MD somewhere, and I'm gonna have him install my clutch and flywheel...hopefully we could do it on the same day.
AustinSTi is offline   Reply With Quote
Old 07-30-2003, 02:55 AM   #9
White 2.5rs
Scooby Guru
 
Member#: 39936
Join Date: Jul 2003
Vehicle:
99RS TWE&SCAT EJ257
Hydra+HMist+PPG+35R=DEATH

Default

ive heard something about a problem w/ grounding around those rpms

i heard this back before i knew much about scoobs so i dont remember really what it was about but this guy that told me had huge new grounding cables on his car and was ranting about how big of a hessitation is caused w/o them


maybe that will help

alex
White 2.5rs is offline   Reply With Quote
Old 07-30-2003, 03:53 AM   #10
dRu888
Scooby Specialist
 
Member#: 8305
Join Date: Jul 2001
Chapter/Region: BAIC
Location: Santa Clara, CA
Vehicle:
2001 2.5RS
Gunmetal

Default

sometimes when accelerating in 3rd i feel a slight hesistation...actually all the time... >:T
dRu888 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
2007 STI & WRX with Hesitation/Gearing Problems? squashman News & Rumors 277 09-03-2007 01:10 AM
Question on clutch shudder problem with 02 WRX x Neo x Transmission (AT/MT) & Driveline 4 10-13-2003 10:24 PM
So What's the Deal with the Cold Start Clutch Shudder? Flea New England Impreza Club Forum -- NESIC 14 07-17-2001 09:16 PM
OK, what's the deal with the shuddering clutch? Mike Smith Normally Aspirated Powertrain 10 07-17-2001 05:05 PM
I have the terrible Cold clutch shudder problem with my 2001 RS scootr Normally Aspirated Powertrain 16 12-21-2000 10:53 PM


All times are GMT -4. The time now is 09:26 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.