Welcome to the North American Subaru Impreza Owners Club Monday December 22, 2014
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 > Service & Maintenance

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 04-10-2008, 01:46 AM   #1
Silver WRX 420
Scooby Newbie
 
Member#: 37498
Join Date: May 2003
Vehicle:
2002 PSM WRX w/
JDM STI V7 motor swap

Default Water pump going bad?

I have a 2002 WRX. At 49,000 miles I blew the stock motor and swapped in an EJ207. Lately, when my car sits at idle, the temperature gauge will start climbing up and will go all the way above the top line if it sits too long. If I start driving, or keep the motor revving above 2000 RPMs it will drop down to normal temperatue. The car now has 162,000 miles on it and the motor had about 10,000 on it when I put it in. I am getting ready to change out the timing belt and believe the water pump is in need of being replaced as well. Do these symptoms sound like a water pump going bad, or is there something else I should look for?
* Registered users of the site do not see these ads.
Silver WRX 420 is offline   Reply With Quote
Old 04-10-2008, 04:02 PM   #2
Silver WRX 420
Scooby Newbie
 
Member#: 37498
Join Date: May 2003
Vehicle:
2002 PSM WRX w/
JDM STI V7 motor swap

Default

Bump..any help anyone? Please
Silver WRX 420 is offline   Reply With Quote
Old 04-11-2008, 05:57 PM   #3
Silver WRX 420
Scooby Newbie
 
Member#: 37498
Join Date: May 2003
Vehicle:
2002 PSM WRX w/
JDM STI V7 motor swap

Default

Bump again.

I have done a complete coolant system flush and still getting the same results.
Silver WRX 420 is offline   Reply With Quote
Old 04-11-2008, 06:26 PM   #4
wrxdrvr
Scooby Specialist
 
Member#: 79222
Join Date: Jan 2005
Chapter/Region: W. Canada
Location: Canada BC
Vehicle:
'09 STi 297.5 WHP
Blue

Default

When you are sitting there idling and the temps start going up rev up the engine to 2,500-3,000 and the temps should drop quite fast. If not then it could be the water pump I guess, but most likely you need to burp the coolant to get ALL the air bubbles out, even if you already did that do it again...
wrxdrvr is offline   Reply With Quote
Old 04-13-2008, 10:27 PM   #5
Silver WRX 420
Scooby Newbie
 
Member#: 37498
Join Date: May 2003
Vehicle:
2002 PSM WRX w/
JDM STI V7 motor swap

Default

Quote:
Originally Posted by wrxdrvr View Post
When you are sitting there idling and the temps start going up rev up the engine to 2,500-3,000 and the temps should drop quite fast. If not then it could be the water pump I guess, but most likely you need to burp the coolant to get ALL the air bubbles out, even if you already did that do it again...

No to sound like an idiot, but how do you burp the coolant system? I had a complete flush done about a month ago and it is still doing the same thing.

If I keep the RPM's above 2500ish the temperature will either not go up, or it will drop if it has risen. If I come to a stop at a traffic light it will quickly start to go up and then once I start driving it will drop again.

I was trying to think of anything that could cause it, and I figured if it was the thermostat it would be stuck open/closed and the temperature wouldn't come back down, there is no leak in the radiator, so the logical thought is that the component that would be directly affected by RPM's would be the water pump because it is driven by the timing belt, correct?

If it needs to be replaced, does anyone know if the part is the same for the JDM STI EJ207 as it would be for a USDM EJ20T for a 2002?

Would I be better off posting a question in a different forum(Conversions etc.?) I don't want to get flamed for cross posting.

Thanks guys!
Silver WRX 420 is offline   Reply With Quote
Old 04-13-2008, 10:48 PM   #6
wrxdrvr
Scooby Specialist
 
Member#: 79222
Join Date: Jan 2005
Chapter/Region: W. Canada
Location: Canada BC
Vehicle:
'09 STi 297.5 WHP
Blue

Default

I don't know anything about the v7, but for my '02 wrx with two rad caps I would take off the highest one by the turbo when engine is cold and start the car. Once it starts to warm up rev it up easy a bit every now and then and add coolant if flow drops down lower than full at the cap. Do it till fans come on and then close system by putting cap back on. May need to do it a couple of times.

EDIT; Forgot to say squeeze top rad hose a bit every once in a while too...

Last edited by wrxdrvr; 04-14-2008 at 11:40 AM.
wrxdrvr is offline   Reply With Quote
Old 04-13-2008, 11:07 PM   #7
rkramer
Scooby Guru
 
Member#: 118209
Join Date: Jun 2006
Chapter/Region: MWSOC
Location: North Dakota
Vehicle:
2015 WRX Limitec

Default

The stock '02 radiators didn't have a cap, so i'm guessing he swapped only the engine, not the radiator.
rkramer is offline   Reply With Quote
Old 04-14-2008, 04:21 PM   #8
Silver WRX 420
Scooby Newbie
 
Member#: 37498
Join Date: May 2003
Vehicle:
2002 PSM WRX w/
JDM STI V7 motor swap

Default

Yeah I just swapped the motor, still have the stock radiator. I will give it a shot and see what happened and let you guys know.

Thanks guys!
Silver WRX 420 is offline   Reply With Quote
Old 04-14-2008, 06:25 PM   #9
DiscoGsus
Scooby Specialist
 
Member#: 47646
Join Date: Nov 2003
Chapter/Region: MAIC
Location: NoVa
Vehicle:
0211 RallyWagon
DGM Sedan

Default

When you say rev it to 2500 or so. If you mean while driving, then thats why it starts to cool down as air starts to blow through it.

If it goes down as soon as you just rev the engine while stopped then I would guess water pump or even a partially blocked line.
DiscoGsus is offline   Reply With Quote
Old 04-14-2008, 11:10 PM   #10
Silver WRX 420
Scooby Newbie
 
Member#: 37498
Join Date: May 2003
Vehicle:
2002 PSM WRX w/
JDM STI V7 motor swap

Default

It's when I reve it to 2500 while sitting still or once I start driving and I keep it above 2000ish it will drop and stay down. If I'm going down the highway and let it coast in neutral the temperature will start to rise even eith air flowing through it. I never thought of the partially blocked line. If burping the system does not work I will try to check/replace the lines before doing the water pump.
Silver WRX 420 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
Do Oil pumps go bad at 65K or is it just the seal kecksubaru Legacy Forum 4 01-17-2007 02:24 PM
Walbro fuel pump going bad or something else? Fairlane Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 12 12-28-2006 12:55 PM
Anyone had a power steering pump go bad? scoobie1 Brakes, Steering & Suspension 1 03-04-2006 04:39 PM
Fuel Pump going bad? S-1 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 4 03-19-2003 04:43 PM
Is my fuel pump going bad? Or is it worse? NicGordon Service & Maintenance 5 10-15-2002 03:43 PM


All times are GMT -4. The time now is 10:33 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.