Welcome to the North American Subaru Impreza Owners Club Sunday October 4, 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 > 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.
Thread Tools Display Modes
Old 09-19-2013, 06:33 PM   #1
Scooby Newbie
Member#: 6752
Join Date: May 2001
Location: Montpelier, VT, USA
Default Seafoam in intake (97 OBS)

Hey folks,
still trying to figure out why my impreza is always idling high. It's a 97 outback sport. EJ22. I'm hoping to avoid pulling and cleaning the IAC valve. It sounds like some people have had luck with seafoam. The shop near me has the regular seafoam liquid and a seafoam in a spray can. I'm wondering if anyone can tell me exactly how to go about seafoaming the intake side of the engine. Exactly where do I spray (I'm assuming I should use the spray) the seafoam to clean the IAC? It sounds like the turbo guys do it on the vacuum line to the BOV. Some people use the vacuum line to the brake booster? Does that sound right? thanks!
* Registered users of the site do not see these ads.
czo79 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 09-19-2013, 06:58 PM   #2
Scooby Specialist
Member#: 294461
Join Date: Sep 2011
Chapter/Region: NWIC
Location: Grass Pants, OR
1997 Outback Sport


Your best bet is to do it through the PCV line. It's the closest vacuum to center on the non turbo cars.

As far as the IACV, I always clean them with gasoline and q tips.
cal_look_zero is offline   Reply With Quote
Old 09-19-2013, 08:25 PM   #3
NASIOC Supporter
Member#: 165749
Join Date: Dec 2007
Chapter/Region: South East
Location: ლಠ益ಠ&

If you use the spray you can direct it right into the intake anywhere after the MAF sensor. If you don't have an MAF based system then anywhere after the air filter. The only downside is that some if it will get stuck in the air box just before the throttle body. The best is to go right in the throttle body if you don't mind pulling of the intake assembly connected to it.

If you use the non pressurized can of sea foam liquid, any line that goes to the intake after the throttle body will technically work, however, if that line connects to the intake manifold anywhere except the center plenum it may not get into all the combustion chambers equally or at all.

I would expect that cleaning combustion chambers and associated parts with sea foam will not lower your idle speed.

If you can hook up a scan gauge, check the coolant temp when warm to be sure it's accurate. A faulty sensor giving the ecu an artificially low coolant temp signal will cause a higher isle speed and rich mixture. The IACV could probably benefit from a good cleaning and reseal if it's been several years since it was last done. Besides, it's cheap and relatively easy to do.
GrundleJuice is offline   Reply With Quote
Old 09-24-2013, 09:36 PM   #4
Scooby Newbie
Member#: 319606
Join Date: May 2012
Location: O town UT
01 Outback
Burgandy, Ron


Anyone know if this is bad for o2 sensors?
schrek1991 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 04:44 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.