Welcome to the North American Subaru Impreza Owners Club Wednesday August 15, 2018
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
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 08-09-2018, 09:48 PM   #1
strykerhorse
Scooby Newbie
 
Member#: 236736
Join Date: Jan 2010
Chapter/Region: MAIC
Vehicle:
2002 WRX Sport Wagon

Subaru Banner Tactrix - logging an 02 WRX that shudders

I'm looking to fix some issues with my 02 wagon and recently purchased a Tactrix 2.0 unit to get the car logged. I'd been experiencing a lot of shuddering and loss of power while at low to mid throttle. I'm guessing it's due to a boost leak, a vacuum leak, or a bad O2 sensor.

I made a log using RomRaider the other day of my drive home and logged parameters recommended by this link.

Link to the log on Google Drive is below:

https://drive.google.com/open?id=12K...AiD4FHZ3Xv6IAA

I'd like some help reading this log to determine if there's a boost/vac leak or if the O2 sensor is bad so I can get my parts replacement budget in order. I appreciate any assistance you all can throw my way!
* Registered users of the site do not see these ads.
strykerhorse is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 08-09-2018, 10:58 PM   #2
2gnt2wrx
Scooby Specialist
 
Member#: 123625
Join Date: Aug 2006
Chapter/Region: NESIC
Location: Dover, NH
Vehicle:
2015 WRX
Galaxy Blue

Default

If it's shuttering and acting up, I'd search around for a broken/cracked/disconnected vacuum hose before logging, follow the black plastic intake tube all the way to the turbo. They are notorious for ripping at the turbo connection, then look at all the boost control solenoid connections, those are notorious for getting brittle and cracking over time. You can spray some carb cleaner over the vacuum system and if the engine changes tone... you found a leak. Any and all leaks after the MAF sensor next to the airbox are going to jack the tune up.
2gnt2wrx is offline   Reply With Quote
Old 08-12-2018, 12:11 PM   #3
subaru_gc8
Scooby Specialist
 
Member#: 29292
Join Date: Nov 2002
Chapter/Region: SCIC
Location: Orange County CA
Vehicle:
2004 WRX wagon
silver

Default

Quote:
Originally Posted by strykerhorse View Post
I'm looking to fix some issues with my 02 wagon and recently purchased a Tactrix 2.0 unit to get the car logged. I'd been experiencing a lot of shuddering and loss of power while at low to mid throttle. I'm guessing it's due to a boost leak, a vacuum leak, or a bad O2 sensor.

I made a log using RomRaider the other day of my drive home and logged parameters recommended by this link.

Link to the log on Google Drive is below:

https://drive.google.com/open?id=12K...AiD4FHZ3Xv6IAA

I'd like some help reading this log to determine if there's a boost/vac leak or if the O2 sensor is bad so I can get my parts replacement budget in order. I appreciate any assistance you all can throw my way!
what makes you think its a leak? honestly it takes a huge leak to make it shudder and it should throw a light as once your fuel trims get to a certain point to compensate for the extra air. My guess would be ignition. When was the last time you changed your coils and plugs? if this hasnt been done, that is where I would start

after looking at your log I dont think your problem is a leak. or af learning stays at zero from what I can tell so its not compensating at all for extra unmetered air so I would start go to what I said
subaru_gc8 is offline   Reply With Quote
Old Yesterday, 12:38 PM   #4
strykerhorse
Scooby Newbie
 
Member#: 236736
Join Date: Jan 2010
Chapter/Region: MAIC
Vehicle:
2002 WRX Sport Wagon

Default

Hm, interesting line of thought. What parameters should I be logging to check the coils' function? I changed the plugs (but not the coils) a little after I bought the car around 2.5 years ago.
I do think there's something up with the O2 sensor as it's not changing values over the duration of my drive. I probably had 10 miles on that log---is this a normal thing?

Last edited by strykerhorse; Yesterday at 04:13 PM. Reason: added additional question
strykerhorse is offline   Reply With Quote
Old Yesterday, 09:31 PM   #5
strykerhorse
Scooby Newbie
 
Member#: 236736
Join Date: Jan 2010
Chapter/Region: MAIC
Vehicle:
2002 WRX Sport Wagon

Default

Update: I checked if codes were stored and I found a P0031 active for my car. I'll check the resistance of the O2 sensor, and if it's out of spec, a new one may fix all my issues. Here's hoping!
strykerhorse 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 01:30 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2018 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.