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Old 01-19-2020, 05:16 PM   #1
Hopdaddy32
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Member#: 491936
Join Date: Sep 2018
Location: Midwest US
Vehicle:
1997

Default 03 WRX Stumble help!

Hey guys I have an 03 WRX 5MT with a JDM EJ205. I've had a minor stumble for a couple months and as I finally had time to track it out down it got much worse. No worries at the time, as FIC made it slightly better, and then a new under hood fuel filter made it run nearly flawless... for only about a week. Sat for 2 days, drove it today and it was extremely severe and fuel economy was atrocious (half a tank on a 45 mile drive!!). Its about -10 degrees right now and was 60 last week. Also have a CeL for a P044x. Any help is much appreciated, I'm a bit of noob so take it slow and easy on me, thanks!
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Old 01-19-2020, 05:26 PM   #2
subaru_gc8
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Member#: 29292
Join Date: Nov 2002
Chapter/Region: SCIC
Location: Orange County CA
Vehicle:
2004 WRX wagon
silver

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did yo get it tuned?
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Old 01-19-2020, 07:11 PM   #3
Hopdaddy32
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1997

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Downpipe, full exhuast, and walboro fuel pump are the only things. Tuned on cobb stage 2. Ran perfectly fine, tons of power, totally smooth, before this. Been on this setup for about a year
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Old 01-19-2020, 08:22 PM   #4
NicMonte
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Member#: 479655
Join Date: Dec 2017
Location: Omaha, Ne
Vehicle:
2020 Impreza wrx
CWP

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I have a jdm ej205 as well, someone correct me if I’m wrong but the compression is different, so a cobb map would compensate for a Usdm compression ratio. Not a jdm ratio. I have my motor and mods E-tuned through the AccessPort.

Don’t know if your issue is due to driving it on a tune meant for a usdm setup. Everything I read is follow the Cobb maps to a T. And get a tune for a jdm motor if you are running that setup. Idk how far you could get with running a map meant for a US setup (miles, years etc.)

Someone correct me if I’m wrong, as I have gone through many threads before I did my initial swap.
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