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Old 04-15-2019, 12:35 PM   #1
Dadsquatch
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Default 02 ej205.. just another lightweight flywheel misfire.

Hi all... I did a little research before I bought this XTD stage 2 clutch and 12lb light weight flywheel.. first I must say, I love the feel and engagement. Even the wife lives it. I also have good experience with the older ej20's and 9lb. And 11lb flywheels. Not this one... not this time.. I keep getting random cylinder misfires. 1-4 reset 1-3-2 reset 1-2 low idle drop, stalling occasionally only on long rpm drops. I'm going to replace the ecu and replace the crank and cam sensors (since I have them laying around) and see if these are not as sensitive?.. but I think I'm going to have to get a 14lb.. I'll keep this light weight one and put it in the fozzy or a rally car.. but in disappointed.. mainly because of the lack of users posting about these.. I thought it was pretty good.. I sent them an email and got a generic reply saying that they've been selling these since 2005 without any peoblems..
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Old 04-15-2019, 06:27 PM   #2
Charlie-III
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For Subaru EJ, 11-12lbs is generally accepted as a fine minimum weight without misfire issues.
I have run a 12lb for many years/miles with no issues.
Going to a 9-10lb or less is pretty much guaranteed to be an issue, or 11-12lb with light pullies.
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Old 04-16-2019, 08:32 AM   #3
Shik
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We put a ACT Streetlite flywheel in my kid's bugeye when we did his clutch.

Before the flywheel, virtually no misfire CEL in a year or so of driving.

After the flywheel, it won't go a day without throwing a misfire CEL. And the ACT Streetlite is near 14lbs I believe. Stock pulleys otherwise.

I know this info is getting super old, but SOA did have revisions to the 02' ECU's way back when to address misfires/cam sensor, etc. Maybe the ecu's that had the update are more tolerant to lightweight flywheels? And how would having an accessport affect the ecu that has the updates vs an ecu that does not? Just thinking out loud.
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Old 04-16-2019, 01:29 PM   #4
T-37
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Could you try raising your idle RPM with Romraider/Accessport before replacing the ECU or ditching the clutch?

Or maybe try a heavier crank pulley (Fluidampr/ATI) if you have a lightweight one on there (I think those 2 are slightly heavier than stock as well).
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Old 04-17-2019, 07:23 PM   #5
Dadsquatch
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Well, I put another 120 miles on it. Stalled 3 or 4 times. Then today I drove it another 60 miles. No problems. No low idle drop, no stalling. No misfire codes. No changes to the ecu or sensors. Could have been something with the ram air intake and rain.. I am planning on using the romraider with the open source mapping. It's on the way. As well as a wide band and a boost gauge.. thanks for the input guys.
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Old 04-18-2019, 12:39 AM   #6
Dadsquatch
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Started it up and drove 5 miles to the store and back. On the way back it threw a misfire code. Only difference is the way the wife and I drive.
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Old 04-18-2019, 09:54 AM   #7
Charlie-III
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Do you feel a misfire, or does it just pop the code?
Is it still random on which cylinders pop a code?
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