Welcome to the North American Subaru Impreza Owners Club Monday October 20, 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 > 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.
Reply
 
Thread Tools Display Modes
Old 07-23-2009, 09:25 PM   #1
xTourniquet
Scooby Newbie
 
Member#: 177477
Join Date: Apr 2008
Chapter/Region: MAIC
Location: Maryland
Vehicle:
2006 WRX Limited
Aspen White

Legacy 2002 Legacy Rough Idle

I had originally thought that it might be a problem with the EGR valve but after searching I saw that Subaru stopped using them in 1996. Is that true?

Here's the problem. After the car is warm and I come to a stop at a stop light, or something of the sort, the car idles very low and very rough. It feels like it's barely running. This is made worse when the A/C is on. If you put the car in neutral or park when the rough idle presents it self it goes away. It's an automatic.

Do you think it could be something with the transmission? Or PCV valve?

The car was just in the shop for a torn CV boot and I had them replace the spark plugs and fuel filter. The oil was also just changed less than 1000 miles ago with Mobil 1.

Any help is greatly appreciated! Thanks.
* Registered users of the site do not see these ads.
xTourniquet is offline   Reply With Quote
Old 07-24-2009, 04:33 AM   #2
Charlie-III
Scooby Specialist
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: 07456, North NJ
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper Wagon

Default

My 1998 has an EGR valve, I believe yours does to.
Did your idling issues start after the new plugs & wires were installed or was it like that before?

If the idling issues started after the plugs were installed, what brand plugs & wires went in? Were they OEM?
Charlie-III is offline   Reply With Quote
Old 07-24-2009, 04:57 AM   #3
iluvdrt
Scooby Specialist
 
Member#: 46248
Join Date: Oct 2003
Chapter/Region: RMIC
Location: DRTY Autosports Denver, Co
Vehicle:
2012 outback 2.5
sky blue

Default

Quote:
Originally Posted by xTourniquet View Post
I had originally thought that it might be a problem with the EGR valve but after searching I saw that Subaru stopped using them in 1996. Is that true?

Here's the problem. After the car is warm and I come to a stop at a stop light, or something of the sort, the car idles very low and very rough. It feels like it's barely running. This is made worse when the A/C is on. If you put the car in neutral or park when the rough idle presents it self it goes away. It's an automatic.

Do you think it could be something with the transmission? Or PCV valve?

The car was just in the shop for a torn CV boot and I had them replace the spark plugs and fuel filter. The oil was also just changed less than 1000 miles ago with Mobil 1.

Any help is greatly appreciated! Thanks.
Mine is an automatic and does that too. Some times of I inch forward a hair or shift in and out of D it goes away. I would love to know the answer to that.
I have checked engine mounts, trans mounts, pitch rods, I cannot find the problem. Engine is smooth as glass in park or neutral even with the AC on. Sometimes its bad enough I have to put it into N or it will rattle apart LOL.
iluvdrt is offline   Reply With Quote
Old 07-24-2009, 09:22 AM   #4
xTourniquet
Scooby Newbie
 
Member#: 177477
Join Date: Apr 2008
Chapter/Region: MAIC
Location: Maryland
Vehicle:
2006 WRX Limited
Aspen White

Default

Quote:
Originally Posted by Charlie-III View Post
My 1998 has an EGR valve, I believe yours does to.
Did your idling issues start after the new plugs & wires were installed or was it like that before?

If the idling issues started after the plugs were installed, what brand plugs & wires went in? Were they OEM?
The idling issues started before the spark plugs. They didn't change the wires though, I guess I should check those out.

If I DO have an EGR valve, where is it?

Quote:
Originally Posted by iluvdrt View Post
Mine is an automatic and does that too. Some times of I inch forward a hair or shift in and out of D it goes away. I would love to know the answer to that.
I have checked engine mounts, trans mounts, pitch rods, I cannot find the problem. Engine is smooth as glass in park or neutral even with the AC on. Sometimes its bad enough I have to put it into N or it will rattle apart LOL.
Yep, sounds like we're both having the same problem. Have you checked for vacuum leaks? I might do that next.
xTourniquet is offline   Reply With Quote
Old 07-24-2009, 10:27 AM   #5
iluvdrt
Scooby Specialist
 
Member#: 46248
Join Date: Oct 2003
Chapter/Region: RMIC
Location: DRTY Autosports Denver, Co
Vehicle:
2012 outback 2.5
sky blue

Default

Quote:
Originally Posted by xTourniquet View Post
The idling issues started before the spark plugs. They didn't change the wires though, I guess I should check those out.

If I DO have an EGR valve, where is it?



Yep, sounds like we're both having the same problem. Have you checked for vacuum leaks? I might do that next.
No, but I did a complete top end rebuild about a year ago. I think it is trans related looking into the Haynes manual t-shooting section.
iluvdrt is offline   Reply With Quote
Old 07-25-2009, 01:22 AM   #6
Charlie-III
Scooby Specialist
 
Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: 07456, North NJ
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper Wagon

Default

Quote:
Originally Posted by xTourniquet View Post
The idling issues started before the spark plugs. They didn't change the wires though, I guess I should check those out.

If I DO have an EGR valve, where is it?
I prefer to use OEM ignition wires as they work well.

EGR valve is on the rear of the engine, near the top, on the drivers side. It will have a ~3/8" dia SS tube out the bottom down to the exhaust port area
Charlie-III is offline   Reply With Quote
Old 07-26-2009, 01:19 PM   #7
xTourniquet
Scooby Newbie
 
Member#: 177477
Join Date: Apr 2008
Chapter/Region: MAIC
Location: Maryland
Vehicle:
2006 WRX Limited
Aspen White

Default

Thanks Charlie, I'll check that out next weekend when I have some time.
xTourniquet is offline   Reply With Quote
Old 07-28-2010, 11:56 AM   #8
rinna chan
Scooby Newbie
 
Member#: 195927
Join Date: Nov 2008
Default

Bringing this back from the dead, I'm having the exact same problems and am wondering if anyone ever figured out what it was. I've got a 2000 Outback a/t. Just did the plugs, grounds, cleaned the IAC, new air filter, lots of miles for any ecu idle re-learning. Pretty stumped at the moment and would rather not throw random parts at it to fix it. I'm thinking its electronic since it goes away in park and neutral and when the a/c is engaged.
rinna chan is offline   Reply With Quote
Old 07-28-2010, 12:04 PM   #9
xTourniquet
Scooby Newbie
 
Member#: 177477
Join Date: Apr 2008
Chapter/Region: MAIC
Location: Maryland
Vehicle:
2006 WRX Limited
Aspen White

Default

Unfortunately I never got this problem resolved and the car still does it if you guys have any more tips I will gladly give them a try.
xTourniquet 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
Rough idle, intermitent and rough cold starts... carter_wrx Pre-2002 Factory Turbo Powertrain 26 10-28-2009 01:03 PM
2002 Wrx Cold Rough Idle narib2001 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 5 02-23-2009 08:58 PM
1996 legacy rough idle, tried everything I can find brian3676 Normally Aspirated Powertrain 6 09-30-2008 04:57 PM
98 Legacy starts, idles rough for ~3 sec then dies jasona Normally Aspirated Powertrain 3 04-16-2006 08:49 PM
2002 WRX misfiring and rough idle rallysport02 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 1 08-20-2005 11:39 AM


All times are GMT -4. The time now is 09:38 PM.


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.