Welcome to the North American Subaru Impreza Owners Club Tuesday May 26, 2015
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
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 > Subaru Conversions

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.
Thread Tools Display Modes
Old 11-10-2014, 03:55 PM   #1
Scooby Newbie
Member#: 325965
Join Date: Jul 2012
Chapter/Region: South East
Location: Melbourne, FL
2002 WRX Wagon

Default EJ207 V7 low compression, please help!

Hey guys, I've spent the last day or two researching the forums and haven't been able to really come across a clear diagnosis for what the problem might be with my 207.

I've been running an EJ207 V7 setup for a little over a year now in an 02 WRX with JDM ECU. Recently, the car was struggling to reach boost over 8-9 psi. Obviously something wasn't right since normal boost range is 18-19 psi.

At first I thought it was just a boost solenoid issue or vacuum leak somewhere, but after testing I found nothing. Pulled the plugs from the motor, did a compression test and found that cylinders 2 & 4 were at 115PSI with 1 & 3 at 130ish PSI. The motor still runs fine, sounds fine, just will not build boost.

My friend told me it could be possible ring land failure but since I saw no oil on the plugs I am hoping its not. Maybe the top ring land and bottom is still intact?

Any advice? Going to do a leak down test tonight to learn more just wanted any opinions/help possible.

* Registered users of the site do not see these ads.
Scoobs17 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 01-20-2015, 07:23 PM   #2
Scooby Newbie
Member#: 336122
Join Date: Oct 2012

motor is probably fine and you have a boost leak..
babaganush is offline   Reply With Quote
Old 05-18-2015, 11:52 PM   #3
Scooby Newbie
Member#: 369079
Join Date: Sep 2013
Chapter/Region: BAIC
Location: Modesto CA Usa
2004 Wrx sti


Sounds like somebodys missing the wastegate restrictor pill......
04wrbscooby is offline   Reply With Quote

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 06:49 AM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2015, North American Subaru Impreza Owners Club, Inc.