Welcome to the North American Subaru Impreza Owners Club Sunday January 21, 2018
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
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. 
Thread Tools Display Modes
Old 02-06-2007, 04:37 AM   #1
Scooby Newbie
Member#: 35400
Join Date: Apr 2003
Location: NorCal

Default Recurring misfire CEL...take two

Didn't get much help out of the N/A forum, so I thought I'd throw it here and see what happens.

My friend's 02 Outback Limited with the 2.5L at about 87K miles, totally stock, has a recurring Cylinder 4 misfire. Only cylinder 4. It comes on about once every two weeks, where we then go and try something and clear the code with the OBD reader. My friend typically sees it when he pulls out of his apartment lot in the morning as he goes to work (and it wasn't there the night before). There is no hesitation or any indication that a misfire occured.

We've changed the plugs, the plug wires, the air filter, increasing fuel octane, and checked the coil pack. The car is pulling ~ 20 inHg of vacuum, so I don't think there's a vacuum leak. There was no listing for a PCV valve at Kragen, so I guess there isn't one. I told him to try a fuel injector cleaner next, but I don't exactly have high hopes of that working. Any ideas?

* Registered users of the site do not see these ads.
KestrelSi is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 02-08-2007, 04:02 AM   #2
Scooby Newbie
Member#: 35400
Join Date: Apr 2003
Location: NorCal


KestrelSi is offline   Reply With Quote
Old 02-08-2007, 05:00 AM   #3
Scooby Specialist
Member#: 53557
Join Date: Jan 2004
Chapter/Region: NWIC
Location: Seattle, WA
2003 WRX - SOLD!
WR Blue Pearl


This is a long shot, but it happened to me in another car. On a six cylinder car, I was getting inconsistent misfires on cylinders 1, 2, 3 and 6. Totally random. Took it to the dealer, and found out that part of the catalytic converter had broken up and gone back into the exhaust preventing air flow.

I don't totally understand what caused it all, but they swapped the exhaust pipes and voila! Its worked fine ever since.

Again, a long shot, but since you've tried so many other things, what the hell?
ilnmcom is offline   Reply With Quote
Old 02-08-2007, 02:56 PM   #4
Scooby Specialist
Member#: 33868
Join Date: Mar 2003
Location: Chesterfield, MO
2003 wrx


Here is a test I did (on a non Subaru) that had interesting results.

If you can get a hold of radiator tester, pressurize the coolant system and leave it pressurized for an hour or so. Take out the plugs and crank the engine holding a white paper towel above the spark plug hole for cylinder #4.

See if there are green specs on the towel.
rick-l is offline   Reply With Quote
Old 02-08-2007, 03:37 PM   #5
Scooby Newbie
Member#: 133750
Join Date: Dec 2006

hmm my friend had this problem on his v8 swap he did into is model A. he had a valve sticking open and close, it would work but everynow and then it would stick open or closed then he bent it. im not sure if that would be relevent to this situation.
Bullitzx2 is offline   Reply With Quote
Old 02-18-2007, 02:05 AM   #6
Scooby Specialist
Member#: 4889
Join Date: Mar 2001
Chapter/Region: BAIC
Location: Tracy, CA, USA
2004 Impreza TS
Pacifica Blue Pearl


Similar thing happened on my brother's '02 WRX. Cylinder 3 would misfire every 5-6 months or so. It was always when the car was cold, while slowing to (or sitting at) a stop. We didn't notice any other symptoms, then one day the car lost an exhaust valve on cylinder 3.
AVATAR-X is online now   Reply With Quote
Old 03-13-2007, 10:04 AM   #7
Scooby Newbie
Member#: 143210
Join Date: Mar 2007

I am having the same issue right now. Recurring misfire on cylinder 3, even after I replaced the plugs, wires, and ignition coil.
pbpancho is offline   Reply With Quote
Old 03-13-2007, 12:25 PM   #8
North Ursalia
Miss You Mom
Oct 1940 - Feb 2008

Super Moderator
Member#: 809
Join Date: Jan 2000
Chapter/Region: NESIC
Location: NH, Land Of Many Trees
2000 2.5 RS, '14 For
92 5MT SVX


Try a top engine cleaner (Subaru, seafoam, etc.) or replacing the knock sensor

North Ursalia 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Misfired, CEL, fixed misfire, cleared CEL, failed smog... mc2 Service & Maintenance 3 03-20-2009 09:50 AM
Misfired, CEL, fixed misfire, reset CEL, failed smog... mc2 Normally Aspirated Powertrain 1 03-19-2009 06:59 PM
Recurring Various CEL Code Problem afcivileng Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 1 11-28-2007 09:25 PM
Recurring misfire CEL KestrelSi Normally Aspirated Powertrain 2 03-13-2007 03:37 PM
CEL recurring misfire Keith99RS Outback Forum 10 10-03-2003 03:45 PM

All times are GMT -4. The time now is 01:27 AM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2018 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.