subaru rough idle - Subaru Outback - Subaru Outback Forums

SubaruOutback.org is the premier Subaru Outback Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Rate Thread
Old 08-30-2012, 01:12 AM   #1 (permalink)
Registered User
 
Join Date: Aug 2012
Posts: 4
Feedback Score: 0 reviews
Default subaru rough idle

i have a 98 subaru legacy outback i put new plugs and wires on it when it is at a idle it runs rough and then the check engine light comes on code is always cylinder 4 misfire it runs fine other wise any ideas
thanks
Ron
rlater38 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 08-30-2012, 08:45 AM   #2 (permalink)
Registered User
 
DavidPeab's Avatar
 
Join Date: Apr 2012
Location: Pasadena, MD
Car: Little Red, 2000 Outback H4 "Limited"
Posts: 1,972
Feedback Score: 3 reviews
Default

If it started running rough AFTER you put the new plugs and wires in, I would take a multimeter and check the continuity of the wires, make sure the spark plug in cyl 4 is seated properly, and check the coil. There are threads you can search here for the procedure to check the coil.

If you put the plugs and wires in to try and fix the running rough (seems more likely), than I defer to one of the more experienced gurus here.
DavidPeab is offline   Reply With Quote Quick reply to this message
Old 08-30-2012, 12:09 PM   #3 (permalink)
Registered User
 
1ATony's Avatar
 
Join Date: Aug 2012
Posts: 3
Feedback Score: 0 reviews
Default

What you can do too is, get a spray bottle full of water and with the car running mist the plug wires and look to see if any of them are arching out.

It is possible to receive a bad plug wire even if it's new. It's happened to me before. Hope this helps you out.

Tony
1ATony is offline   Reply With Quote Quick reply to this message
Old 08-30-2012, 12:35 PM   #4 (permalink)
Registered User
 
Join Date: Aug 2012
Posts: 4
Feedback Score: 0 reviews
Default

i am going to try a nother new plug on that cylinder it was doing it when i got it a few weeks back when driving it it runs fine was wondering if a fuel injector could be clogged and not allowing enough fuel when at a idle
rlater38 is offline   Reply With Quote Quick reply to this message
Old 08-30-2012, 12:40 PM   #5 (permalink)
Registered User
 
1 Lucky Texan's Avatar
 
Join Date: Jan 2004
Location: behind the Krell Metal door
Car: 03 H6 OBW & 06 WRX Sportwagon
Posts: 7,027
Feedback Score: 0 reviews
Default

I was gonna ask why you did the plugs and wires.

also, what brand of plugs and wires?

Any chance you had a little trouble on cyl 4 and maybe banged the electrode closed?


run a can of seafoam or Techron through a tank of gas.

miles on car? condition/maintenance? recently purchased?
__________________
Time Flies Like an Arrow,
Fruit Flies Like a Banana!
1 Lucky Texan is offline   Reply With Quote Quick reply to this message
Old 08-30-2012, 12:56 PM   #6 (permalink)
Registered User
 
Join Date: Aug 2012
Posts: 4
Feedback Score: 0 reviews
Default

the first thing i did was run seafoam in it the plugs are denso plat and the wires are autolite the problem was there when i got the car it has 160,000 on it i checked the plug before i put it in the electrode was not bent i used a spark tester and coil and wire at plug end are firing a good blue spark
i used a spray bottle at nite there were no arcs on any thing
rlater38 is offline   Reply With Quote Quick reply to this message
Old 08-30-2012, 01:09 PM   #7 (permalink)
Registered User
 
Join Date: Mar 2010
Location: Redondo Beach CA
Car: 01 Outback LL Bean
Posts: 1,331
Feedback Score: 0 reviews
Default

Most likely injector or burnt valve. I would do a leak down test.
Glennda5id is offline   Reply With Quote Quick reply to this message
Old 08-30-2012, 01:48 PM   #8 (permalink)
Registered User
 
1 Lucky Texan's Avatar
 
Join Date: Jan 2004
Location: behind the Krell Metal door
Car: 03 H6 OBW & 06 WRX Sportwagon
Posts: 7,027
Feedback Score: 0 reviews
Default

^^^^^ +1 on compression test. And swapping injectors with another cyl would confirm/negate the injector theory.

recently, a guy on a Forum discovered his dead cyl 4 had only 25 psi compression.

some folks have problems with plug wires other than OEM. I have no idea about success with Autolite. If you still have the old plug wires, you could try substituing one in on cyl 4 as a test I suppose.
__________________
Time Flies Like an Arrow,
Fruit Flies Like a Banana!
1 Lucky Texan is offline   Reply With Quote Quick reply to this message
Old 08-30-2012, 02:41 PM   #9 (permalink)
Registered User
 
Join Date: Aug 2012
Posts: 4
Feedback Score: 0 reviews
Default

ok i will give that a try and let u know
thanks for the help
rlater38 is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply


Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Subaru Outback - Subaru Outback Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 03:48 AM.



Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.3.2
Copyright 2009-2010 SubaruOutback.org. All Rights Reserved.