Welcome to the North American Subaru Impreza Owners Club Thursday July 31, 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 > Factory 2.0L Turbo 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 05-10-2004, 07:47 PM   #1
Pochebum
Scooby Newbie
 
Member#: 19041
Join Date: May 2002
Location: San Clemente/Pasadena
Vehicle:
2002 WRX
Jungle kitty

Default Misfiring problem please help

A few weeks back I got an exedy flywheel and clutch installed on my car. Since then I've gotten random misfires, usually 1-4. Sometimes I'll get 1, 2, 3 and then a p0000 code. Other times I'll get 4 or 5 p0000 codes. Sometimes they are totally random and i'll get something like 1 and 4. Once I got an maf p0100 code but thats cause I have a retarded intake. I had my car tuned up as best as I can and I don't think I'm running to rich or to lean to a point in which I would misfire. My spark plugs were replaced about 10000 miles ago. It usually misfires around 2-4k when slightly on the gas going at a steady pace and most of the time on cold start. I don't know what is causing this misfires and I would appreciate any opinions.
* Registered users of the site do not see these ads.
Pochebum is offline   Reply With Quote
Old 05-10-2004, 08:02 PM   #2
sc00by71
Scooby Newbie
 
Member#: 5362
Join Date: Apr 2001
Chapter/Region: NWIC
Location: Olympia WA USA
Vehicle:
2004 OBS
Green

Default

How light is your flwheel and do you also have a lightened crank pulley ?
The way I read your post is that the misfires didn't start until after the clutch/flywheel install. Food for thought
Shawn
sc00by71 is offline   Reply With Quote
Old 05-10-2004, 08:07 PM   #3
Pochebum
Scooby Newbie
 
Member#: 19041
Join Date: May 2002
Location: San Clemente/Pasadena
Vehicle:
2002 WRX
Jungle kitty

Default

Its an exedy flywheel so from what I've heard its 14.3 pounds. I have the stock crank pulley. You are correct I had no misfires before the clutch/flywheel.
Pochebum is offline   Reply With Quote
Old 05-10-2004, 08:29 PM   #4
sc00by71
Scooby Newbie
 
Member#: 5362
Join Date: Apr 2001
Chapter/Region: NWIC
Location: Olympia WA USA
Vehicle:
2004 OBS
Green

Default

The flwheel is most likely the culprit. The ecm is sensitive watching for misfire. The lighter flywheel allows the engine speed to slow down and speed up too much after a cylinder fires. Depending on what revision of software is on your ecm there might be a newer version to address misfire sensitivity.
A4SGE00C is the latest revision. You would need the Dealer to pull the ECU Calibration ID to see if it is the newest one. Unfortunately this ecm cannot be dealer flashed so it would need to be sent to SOA. Another possibility is talk to Trey at Cobb. An Accessecu flash may be able to address those codes as well and give you more HP and mileage.
Sorry I couldn't be more help
Shawn
sc00by71 is offline   Reply With Quote
Old 05-10-2004, 08:37 PM   #5
Pochebum
Scooby Newbie
 
Member#: 19041
Join Date: May 2002
Location: San Clemente/Pasadena
Vehicle:
2002 WRX
Jungle kitty

Default

Is there any way I can actually prove that its the flywheel causing these misfires? I was under the impression that the exedy flywheel wouldn't cause this.
Pochebum is offline   Reply With Quote
Old 05-10-2004, 08:46 PM   #6
sc00by71
Scooby Newbie
 
Member#: 5362
Join Date: Apr 2001
Chapter/Region: NWIC
Location: Olympia WA USA
Vehicle:
2004 OBS
Green

Default

I didn't think the exedy was light enough to cause misfires either. I am just going on the basis that the only change was the flywheel. Short of swapping back to the stocker ( which would a pita just to know for sure)
I would look into what calibration the ecm has. SOA updated the ecm calibration on the 02 wrx four times. Two of those were to address misfire codes.

Shawn
sc00by71 is offline   Reply With Quote
Old 05-10-2004, 08:54 PM   #7
JayGold
Scooby Specialist
 
Member#: 7074
Join Date: May 2001
Chapter/Region: MWSOC
Location: Illinois
Default

same problems here, Exedy flywheel is probably causing the random misfire codes.
JayGold is offline   Reply With Quote
Old 05-10-2004, 09:33 PM   #8
Thumper23
Scooby Specialist
 
Member#: 11571
Join Date: Oct 2001
Chapter/Region: MAIC
Location: Virginia Beach, VA
Vehicle:
'08 BMW 135i
F/A-18C

Default

yeah, this is the flywheel throwing the misfires

if you read the loooong misfire thread, that was a reaccuring problem
Thumper23 is offline   Reply With Quote
Old 05-10-2004, 10:30 PM   #9
Pochebum
Scooby Newbie
 
Member#: 19041
Join Date: May 2002
Location: San Clemente/Pasadena
Vehicle:
2002 WRX
Jungle kitty

Default

So is there anyway to get around this besides having a reflash? Is it causing any real damage to my engine?
Pochebum is offline   Reply With Quote
Old 05-11-2004, 01:41 PM   #10
Pochebum
Scooby Newbie
 
Member#: 19041
Join Date: May 2002
Location: San Clemente/Pasadena
Vehicle:
2002 WRX
Jungle kitty

Default

^
Pochebum is offline   Reply With Quote
Old 05-11-2004, 05:00 PM   #11
steak
Scooby Newbie
 
Member#: 38981
Join Date: Jun 2003
Default

subarus have stock nawz and you're misfiring OBVIOUSLy beacuse theres to much nawz...get a band aid, a toothpick and a slim jim and fix the muffler and blinker bearings ASAP!

no0o00b!
steak is offline   Reply With Quote
Old 05-12-2004, 09:58 AM   #12
shields102
Scooby Newbie
 
Member#: 9598
Join Date: Aug 2001
Location: westland mi
Vehicle:
02 wrx
white

Default

Most folks are going to think this is crazy but.....

Do you happen to know if you have the common oil pump o-ring oil leak? I did, and started getting misfires more and more often. I decided to replace my timing belt and when I had the alternator out I checked my crank angle position sensor. COVERD in caked oil. Needless to say.......I no longer have misfire codes.


BTW, that sensor along with the cam position sensor determine misfire.
shields102 is offline   Reply With Quote
Old 05-12-2004, 10:53 AM   #13
Thumper23
Scooby Specialist
 
Member#: 11571
Join Date: Oct 2001
Chapter/Region: MAIC
Location: Virginia Beach, VA
Vehicle:
'08 BMW 135i
F/A-18C

Default

Quote:
Originally posted by steak
subarus have stock nawz and you're misfiring OBVIOUSLy beacuse theres to much nawz...get a band aid, a toothpick and a slim jim and fix the muffler and blinker bearings ASAP!

no0o00b!
you're a moron, thanks for sharing
Thumper23 is offline   Reply With Quote
Old 05-12-2004, 03:54 PM   #14
steak
Scooby Newbie
 
Member#: 38981
Join Date: Jun 2003
Default

Quote:
Originally posted by Thumper23
you're a moron, thanks for sharing
i was kidding no0b. es tea ef you.

when i was behind you you were spittin out some exhaust chunky's, looked VERY rich...but your car still feels fast so i dont know. its either fuel or spark related and since you have new plugs thats more or less ruled out, it happens at random times in random cylinders... so i really dont know man.

it COULD be the crank sensor detecting a 'misfire' because of how fast the crank revs up and down but thats hard if not imopossible to tell.

this sucks to say, but i'd take it into subaru if you're that worried about it. it sounds to me more like its just your flywheel or possibly your fuel pressure at idle is to high, or at least the idle fuel trims are to rich and thats whats causing the misfire, anyway...good luck man, you know i got your back.
steak 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
Need help ASAP with smoking engine problem! PLEASE HELP! DJS_02_WRX Newbies & FAQs 14 10-10-2009 09:59 AM
misfire codes.please help. 2002SUBIE Newbies & FAQs 2 07-24-2007 06:57 PM
I'm in misfire hell, please help! yebokmj Normally Aspirated with bolt-on Forced Induction Powertrain 3 09-15-2003 09:40 PM
('93-'01) big problem....please HELP!!!!! 25psi Impreza Forum 11 05-10-2001 12:50 AM
('93-'01) Gauge light problems please help me Texas25RS Impreza Forum 1 04-25-2001 08:44 AM


All times are GMT -4. The time now is 05:05 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.