Welcome to the North American Subaru Impreza Owners Club Monday September 26, 2016
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 09-21-2016, 10:31 PM   #1
WilliHaM
Scooby Newbie
 
Member#: 453391
Join Date: Aug 2016
Default 02 WRX slight loss of boost

I am hoping there is a pretty simple answer to my problem

Two days ago I was driving and noticed the boost guage was slightly off when full throttle, usually my boost in 3rd gear is around 16-17lbs and its constant. When I would watch the boost gauge since this, the boost will peak around 15.5 and drop to 14 and the hand will look like its vibrating.

This happened when I got a Check Engine Light for a loose gas cap and with a different than stock gas cap this happens every once in a while. I also changed out my battery around the same time as this Check engine light but I think it was after the fact of the loss of boost. I looked at the majority of my lines, only problem I found was with one of my intake tubes was stiff and not clamping on tight, will take pictures tomorrow.

Upgrades:
Stock Turbo
Full exhaust, Cattless
Uppipe and downpipe
Short Air Intake
Aftermarker Turbo Solonoid by GS
Big Intercooler
Believe there is a tune on it
* Registered users of the site do not see these ads.
WilliHaM is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 09-22-2016, 04:01 PM   #2
WilliHaM
Scooby Newbie
 
Member#: 453391
Join Date: Aug 2016
Default

Today I lost a bit more boost, I'm not hearing any bad noise or different noises, I'm going to check all my hoses and tubes today for leaks. Running 12-13 pounds.
WilliHaM is offline   Reply With Quote
Old 09-23-2016, 10:25 AM   #3
hondaeater69
Scooby Guru
 
Member#: 60324
Join Date: Apr 2004
Location: a pillow.
Default

process of elimination, start elminating things. first reset the ECU. if the boost come back, then your issue is something to do with ECU/tune. if this is the case datalog the ecu so we can see why it's pulling boost. if boost stays the same after the reset, then it's most likely mechanical in nature. check for boost leaks, make sure your BCS hoses are correct and proper. make sure your EBCS is working (also pretty sure these have to be tuned for to prevent overboosting). if you have the stock td04 your WG could be getting weak over time, look up the procedure on "how to tighten wastegate on stock td04 turbo".

hth's
hondaeater69 is offline   Reply With Quote
Old 09-23-2016, 11:20 AM   #4
hondaeater69
Scooby Guru
 
Member#: 60324
Join Date: Apr 2004
Location: a pillow.
Default

could also swap out with another GS EBCS... that might tell you something.
hondaeater69 is offline   Reply With Quote
Old Yesterday, 11:40 AM   #5
WilliHaM
Scooby Newbie
 
Member#: 453391
Join Date: Aug 2016
Default

Thanks for the help guys, checked all my lines and found a boost leak with the ebcs, took a few cycles after that but the boost is back to normal and it boosts strong again. Greatly appreciated!
WilliHaM 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 10:49 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2016 Axivo Inc.
Copyright ©1999 - 2016, North American Subaru Impreza Owners Club, Inc.