Welcome to the North American Subaru Impreza Owners Club Saturday July 20, 2019
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo)

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 02-05-2019, 10:37 AM   #1
Shunpiker
Scooby Newbie
 
Member#: 206421
Join Date: Mar 2009
Location: Central NC
Vehicle:
2003 wrx
blue

Default 2003 WRX flashing CEL on cold mornings

`03 WRX, 243000 miles, stock except for aftermarket clutch and smaller flywheel that was installed about 18 months ago. 93 Octane fuel. Oh, I did put a Mishimoto rad in it at about 120000. I am the only owner of the car.

Flashing CEL at times. It will happen when the engine is ~cold, i.e. only been running about 5 minutes. I can shift up through the gears fine, and when I get to fourth and give it moderate throttle, the CEL (sometimes) starts to flash. I will back off, but it keeps flashing for a few seconds. Sometimes the light goes away altogether, and sometimes it stays illuminated. Each time I've read the code, it shows a cylinder misfire (I don't recall if it's one cylinder more-often than another).

There have been 2x instances where the CEL flashed on a very warm (>15 minutes of driving) engine. Both times it happened when I was in fourth and demanded a little more power to climb a hill, accelerating from about 45mph to approaching 60.

From what I've researched on here and other web sources, I've concluded that the aftermarket flywheel -which is smaller than stock- is causing the sensor to detect a misfire. I didn’t have this issue (flashing CEL) before the new clutch was installed. With that in-mind, I haven't lost much sleep over it. However, now that the weather's cold, it happens a bit more frequently. It doesn't happen in the summer months. Ultimately, I'd like you guys to put my mind at ease and tell me not to worry about it, because reading some of the "flashing CEL" threads is scary.

FWIW, I'm very unhappy with this aftermarket clutch/flywheel (I don’t remember the brand right now). I wish I had gone back with the stocker, but the shop talked me into this "performance" part. That being said, I can live with it if we determine that it's no big deal to keep driving it.

Thanks in advance for your time and typing.

John
* Registered users of the site do not see these ads.

Last edited by Shunpiker; 02-05-2019 at 10:38 AM. Reason: punctuation
Shunpiker is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 02-07-2019, 08:02 AM   #2
Shik
NASIOC Supporter
 
Member#: 132
Join Date: Jul 1999
Chapter/Region: Tri-State
Location: PA
Vehicle:
2006 GT Ltd 5spd sdn
'15 WRX 6spd CWP, '02 WRX

Default

Could be a lot of things, but purely based off your mileage and the fact that it seems to be "missing" in the cold weather, I'd say a weakening coil pack may be your culprit. Weak spark is exacerbated the colder it gets. In most cases, our coil packs begin to weaken over time, not just die at once. It will show up more when the engine is under load(i.e.-under boost, accelerating). As far as I know, there is no way to "test" a coil pack other then isolate what cylinder is missing, then swap the coil pack with a known good one, wait for the car to miss again, then see if the miss followed the suspected bad coil pack.

Be sure your spark plugs are in good condition and gapped correctly as well. Also, make sure the connectors for the coil packs do not have any corrosion on the pins inside.


Good luck!
Shik is offline   Reply With Quote
Old 02-08-2019, 11:48 AM   #3
Shunpiker
Scooby Newbie
 
Member#: 206421
Join Date: Mar 2009
Location: Central NC
Vehicle:
2003 wrx
blue

Default

Hi Shik,

Thanks for the feedback and info. I'll keep a closer eye on which cylinder is misfiring and research from there. I really appreciate your time.

Cheers!
Shunpiker is offline   Reply With Quote
Old 02-13-2019, 04:22 PM   #4
NinoS
Scooby Newbie
 
Member#: 496279
Join Date: Jan 2019
Default

If you read the CEL with any OBD2 tool, the code will specify which cylinder is misfiring. I just went through this with my FOZ XT, was a coil pack and was also a flashing CEL, i think my code was P0304 where the 4 is the cyl number.
NinoS is offline   Reply With Quote
Old 02-13-2019, 10:37 PM   #5
hybrid gti 2
Scooby Guru
 
Member#: 67004
Join Date: Jul 2004
Chapter/Region: SCIC
Location: (818) 300k+ ej205 ppg 5mt
Vehicle:
02 vf30 pnp wagon
silver and cf

Default

Wiggle the harness for the coils and see if your idle changes
hybrid gti 2 is offline   Reply With Quote
Old 02-17-2019, 01:23 AM   #6
Boosted_Shoe
Scooby Newbie
 
Member#: 497875
Join Date: Feb 2019
Default

If you havent done plugs In a while or have done them and didn't check the gap you may be blowing the spark out when coming on boost, I had this issue in my 00 forester turned out to be a 1mm gap instead of the required. 7mm gap, hope this helps!
Boosted_Shoe 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

All times are GMT -4. The time now is 01:53 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2019 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.