Welcome to the North American Subaru Impreza Owners Club Friday July 31, 2015
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 with bolt-on Forced Induction 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 07-02-2009, 12:50 PM   #1
Harenil
Scooby Newbie
 
Member#: 93071
Join Date: Aug 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
1995 Impreza L EJ22G
(Hybrid EJ22T/EG20G)

Default Overheating problems - tried almost everything.

I can't figure this one out. I've been running my ej22t swap with a TD04 and 16-17psi for about 2 years now with very very few issues. Recently though, it started overheating. That was back in October (perhaps?). If did it randomly and made no sense (I had replaced the thermostat the previous summer.). My radiator was crap, so I thought that was the problem. Anyway, the overheating randomly stopped for several months. And started up again sometime in April (perhaps?). I'd randomly lose heat for a few seconds, the temperature would spike, then I'd keep driving and it would drop down. It would NEVER overheat on the highway. Then one day the radiator started leaking, and I tore everything down, flushed the coolant, replaced the thermostat, gasket, checked out the water pump (still spins, no broken fins, no rust.), and replaced my stock L radiator with a legacy turbo one. I burped the coolant system, and made sure everything was together right, then started driving it. Worked great for about a week, no leaks, no overheating, no issues at all. About a week later it began to overheat after highway drives. I'd get off the freeway and it would start to overheat at lights. My fans work and I can hear them come on all the time. This overheating was a nuisance and could be usually fixed quickly by revving my engine, then the temperature would drop off quickly. When it overheated, the overflow tank would be overflowing and coolant pouring out. It got annoying. Gradually, the overheating got less frequent and sometimes it wouldn't even overheat for several long drives. When it did, I'd be on the highway, driving fast, then hit traffic and drive slow. It never overheated in traffic, but it liked to after this one traffic light... odd. Anyway, the other day I was driving to work and the temperature just wouldn't go down - even on the highway. It kept climbing even with heat on, even with revving. I pulled over and check the oil and coolant - both fine.. In fact, the overflow tank was nearly full. Temp wouldn't go down.

So I've tried a lot, and replaced almost everything aside from the water pump, head gaskets, and heater core. I don't THINK it's the head gaskets for a few reasons:
1. no oil in coolant.
2. no smoke.
3. oil looks fine - not milky.
4. overheating isn't consistent until now.

I don't know what it could be, and I need an experts help. Please?

Thank you in advance.

Daniel
* Registered users of the site do not see these ads.
Harenil is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 07-02-2009, 01:02 PM   #2
reddevil
Scooby Guru
 
Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
Vehicle:
1990 Legacy wagon
goes 12.387 @ 116.5

Default

Replace the thermostat again with OEM.
reddevil is offline   Reply With Quote
Old 07-02-2009, 01:04 PM   #3
Harenil
Scooby Newbie
 
Member#: 93071
Join Date: Aug 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
1995 Impreza L EJ22G
(Hybrid EJ22T/EG20G)

Default

I just did, not more than a month ago, and also a year before that. Why replace it again?

EDIT* that probably sounds rude... I'm curious though, what is your reasoning? If a new thermostat didn't fix the overheating the first time, why would I put another one in?

Last edited by Harenil; 07-02-2009 at 01:14 PM.
Harenil is offline   Reply With Quote
Old 07-02-2009, 01:21 PM   #4
reddevil
Scooby Guru
 
Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
Vehicle:
1990 Legacy wagon
goes 12.387 @ 116.5

Default

Because you will slap yourself silly if thats all it is.

Try running WITHOUT the t-stat completely for a bit and see what happens.
reddevil is offline   Reply With Quote
Old 07-02-2009, 02:08 PM   #5
Harenil
Scooby Newbie
 
Member#: 93071
Join Date: Aug 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
1995 Impreza L EJ22G
(Hybrid EJ22T/EG20G)

Default

What do you think about the water pump? If it's not leaking, spins, and has no broken fins, is there any reason to believe it is the cause?
Harenil is offline   Reply With Quote
Old 07-02-2009, 02:09 PM   #6
subiidude
Scooby Specialist
 
Member#: 141472
Join Date: Feb 2007
Chapter/Region: MAIC
Location: moco
Vehicle:
2008 shagg wgn STI
OG FP20g+e85 corn booze

Default

maybe the rad cap is bad. have you replaced that recently?
subiidude is offline   Reply With Quote
Old 07-02-2009, 02:19 PM   #7
Harenil
Scooby Newbie
 
Member#: 93071
Join Date: Aug 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
1995 Impreza L EJ22G
(Hybrid EJ22T/EG20G)

Default

Yup, replaced that a couple months back.
Harenil is offline   Reply With Quote
Old 07-02-2009, 05:12 PM   #8
front runner
Scooby Newbie
 
Member#: 121603
Join Date: Jul 2006
Chapter/Region: NWIC
Location: Seattle, Washington
Vehicle:
2001 legacy BH
blue

Default

kinda sounds like headgaskets. you don't generally see oil in coolant or coolant in oil with subarus. try checking for bubbles with the radiator cap off with the car running. if it is that bad you'll see...
front runner is offline   Reply With Quote
Old 07-02-2009, 06:57 PM   #9
Harenil
Scooby Newbie
 
Member#: 93071
Join Date: Aug 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
1995 Impreza L EJ22G
(Hybrid EJ22T/EG20G)

Default

Damn. I'm going to try reddevil's suggestion and pray my car doesn't overheat any more.

Otherwise, I got an excuse to throw on some ej25 SOHC heads. If I have cash, a new tranny and VF39.
Harenil is offline   Reply With Quote
Old 07-02-2009, 09:59 PM   #10
silentt
Scooby Specialist
 
Member#: 119995
Join Date: Jul 2006
Chapter/Region: W. Canada
Location: Canadia
Vehicle:
2004 Outback XT
Peachy

Default

Headgaskets. I had a very similar problem and that's what it turned out to be.
http://forums.nasioc.com/forums/show....php?t=1648780
silentt is offline   Reply With Quote
Old 07-03-2009, 12:46 PM   #11
Harenil
Scooby Newbie
 
Member#: 93071
Join Date: Aug 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
1995 Impreza L EJ22G
(Hybrid EJ22T/EG20G)

Default

Hmm... kinda thinking this is a good excuse to do a rebuild with some (much) better heads, new tranny, and new turbo... Since I've pretty much looked at everything, head gaskets seems to be the only thing left.

Thanks for the help everyone.

Looking at swapping ej20g heads and intake and stuff. The problem I'm looking at is that I'm still running the stock ej18 ecu. How do I convert from wasted spark to the ej20g or ej207 ignition coils? I ask because I was also considering sohc ej25 heads, and I am under the impression I don't have to change anything, or I have to change plug wires or something... anyone know?
Harenil is offline   Reply With Quote
Old 07-03-2009, 02:10 PM   #12
ozzy370
Scooby Specialist
 
Member#: 162469
Join Date: Oct 2007
Chapter/Region: RMIC
Location: Suba Performance, Denver, CO
Vehicle:
2003 WRX wagon
special sauce

Default

Have you replaced all of the radiator hoses lately? When going up and down in altitude with old hoses they will get soft and expand. This will create a bulg in the lines and will not allow the tstat to open.
ozzy370 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
35% off on almost everything on eBay BuyItNow Eyeflyistheeye Off-Topic 588 06-09-2010 09:49 AM
Cant read ECU, tried almost everything. ryrules1 Open Source Reflashes 8 06-29-2009 09:50 AM
20g, RA gears, motor, almost everything, feeler... AWD>FWD NWIC Private Classifieds 46 02-03-2008 07:16 PM
WTB: Almost everything OEM for an 2004 WRX Rick Dizzle Private 'Wanted' Classifieds 14 07-13-2007 03:53 PM
This Stuff Makes Almost Everything Better CandyO Off-Topic 32 04-04-2005 02:54 PM


All times are GMT -4. The time now is 05:36 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.