Welcome to the North American Subaru Impreza Owners Club Monday January 22, 2018
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
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. 
Thread Tools Display Modes
Old 07-30-2012, 09:54 AM   #1
Scooby Newbie
Member#: 175439
Join Date: Mar 2008
Chapter/Region: RMIC
Location: Colorado
2007 RS 4
Phantom Black

Exclamation Misfire in cylinder 1, help!

Hello guys, I have a question on my commuter car that I can't get much help with on any other forums so I figured I would try to ask it here. I have a 2008 KIA Rio LX with 47,000 miles. I bought it with the check engine light on, so I took it to Autozone and they said it was a misfire in cylinder 1. The car runs fine when driving although does have a lack of power, but while idling it runs a little rough. When I first start it the check engine light blinks for about 15 seconds then stays solid. So the first thing I did was pull the spark plugs, the plug in cylinder one had black residue on it so it was replaced but fouled out almost immediately. When I pulled it back out there was a small amount of oil on the threads. So next I did a compression test. The compression in cylinders 1 and 2 were the same and 3 and 4 were also the same, I forget the exact numbers but they were less than 15% off from each other I believe. Next I cleaned out all injectors with a tank treatment, then replaced injector number one while also putting in a new spark plug. That made no difference, then I replaced the valve cover seal and it also came with seals that go around the spark plug tubes. So, none of this worked. The only thing I can think now would be a valve guide seal or a piston ring but I am not sure any more. Also, my gas mileage is still amazing, and it doesn't burn any oil and I've been running it like this for two months and it still runs fine other than idling. Any help would be appreciated thanks!
* Registered users of the site do not see these ads.
ZSTi is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 07-31-2012, 01:27 AM   #2
Scooby Specialist
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Bailey, CO
2001 2.5RS
Black Diamond Pearl


Replace one thing at a time. Can you swap spark plug wires? Do this and see if the misfire changes cylinders. Then move to the injectors. Swap and check for code movement. Check for vacuum leaks. Check for exhaust leaks.
yarrgh is online now   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

All times are GMT -4. The time now is 04:25 PM.

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.