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Old 12-13-2009, 12:04 PM   #1
OldFart
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Default Resurfaced OEM flywheel = CEL!

A couple of months ago the 5MT on my '04 WRX crapped out and I replaced with a low mileage used 5MT from an '05...not about to pay almost $4K for new tranny! Tranny works great, shifts fine, no problems. While trans was down decided to put in new clutch disk and pressure plate (OEM) and have stock flywheel resurfaced. Was fine for first week or so but then got a flashing CEL that went out on its own. Checked codes: P301, P302, P303, P304. Cleared codes. OK for about a week but then same thing...flashing CEL..same codes. Happens once or twice a week now.

I have seen several posts where lightened flywheels can cause this but can the slight amount of lightening from a resurface cause the CEL problem? Is there a fix other than replacing flywheel? Can ECU be reprogrammed? Thanks!
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Old 12-13-2009, 12:08 PM   #2
Uncle Scotty
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if you have a light crank pulley.....put the stock one back on and see if it fixes the issue

also...check the grounding wire that goes from the top of the transmission to the pitch stop.....if that isnt there....it NEEDS to be

and I dont think that you could have had enough material removed from the flywheel to cause this

I'd look for another cause....fuel may have caused injector clogging while the car was down

it could be many things
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Old 12-13-2009, 07:15 PM   #3
OldFart
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I did not think a simple resurfacing would remove that much material. Crank pulley and everything else on car is 100% factory stock. I'll check the ground wire and look for any other possible missing or loose connections.

Car runs perfectly and I don't "feel" any misfire even when the CEL is flashing.

Thanks!
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Old 12-13-2009, 10:47 PM   #4
prometheum
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unless they took off 10lbs worth of material its not gonna cause a CEL...
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Old 12-13-2009, 10:51 PM   #5
PSolbergfan
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I've got an ACT lightweight on my WRX and I've never had a misfire CEL from it. For three years since the install.
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Old 12-14-2009, 01:30 AM   #6
prometheum
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Quote:
Originally Posted by PSolbergfan View Post
I've got an ACT lightweight on my WRX and I've never had a misfire CEL from it. For three years since the install.
do you have the act prolight for street light flywheel? i've got a prolight flywheel and it threw a cel 25 miles after i installed it
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Old 12-14-2009, 06:21 AM   #7
OldFart
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Default OBD II - A love/hate relationship

Right now I'm hating it...
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Old 12-15-2009, 05:06 PM   #8
PSolbergfan
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Quote:
Originally Posted by prometheum View Post
do you have the act prolight for street light flywheel? i've got a prolight flywheel and it threw a cel 25 miles after i installed it
I've got the "streetlight". I did my research. I called ACT prior to buying the parts(that's what's great about ACT, you can ACTUALLY call them) and asked about he CEL issue. ACT claims that the "streetlight" flywheel will not throw a CEL but the "prolight" will and that makes sense. If you look at the weight on an STi light flywheel for the 02 WRX you'll notice that the weights are similiar. Subaru wouldn't sell an OEM high performance part if it caused problems.
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Old 12-15-2009, 07:47 PM   #9
Uncle Scotty
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Quote:
Originally Posted by PSolbergfan View Post
I've got the "streetlight". I did my research. I called ACT prior to buying the parts(that's what's great about ACT, you can ACTUALLY call them) and asked about he CEL issue. ACT claims that the "streetlight" flywheel will not throw a CEL but the "prolight" will and that makes sense. If you look at the weight on an STi light flywheel for the 02 WRX you'll notice that the weights are similiar. Subaru wouldn't sell an OEM high performance part if it caused problems.

the CEL associated with a light flywheel isnt a problem......it is an erronious fault indication....no misfire is acutally happening

and some cars rarely or never have the issue....usually ones with the heavier of the 'light' flywheels
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Old 12-15-2009, 08:52 PM   #10
tolnep
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might as well throw my question in here..

plan to upgrade trans to 6 speed on my 2003.

plan to upgrade pressure plate and clutch..

everything i read tells me to stay with the OEM flywheel which i ok.

ive heard that you cannot get the flywheel re-surfaced with reliability and should purchase new.

so that's my question.. should i just purchase a new flywheel as part of the upgrade and be done?
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Old 12-16-2009, 01:06 PM   #11
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Yes, it's recommended to buy a new one, try one of our vendors here fro the best price.

Granted folks and shadetree mechanics have gotten by with a light resurfacing...
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Old 12-16-2009, 07:50 PM   #12
Uncle Scotty
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Quote:
Originally Posted by tolnep View Post
might as well throw my question in here..

plan to upgrade trans to 6 speed on my 2003.

plan to upgrade pressure plate and clutch..

everything i read tells me to stay with the OEM flywheel which i ok.

ive heard that you cannot get the flywheel re-surfaced with reliability and should purchase new.

so that's my question.. should i just purchase a new flywheel as part of the upgrade and be done?
if you can get it done RIGHT....it isnt an issue.....these are 'stepped' flywheels and need to have the 'feet' shaved the same ammount as the friction face...or so it would seem
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Old 12-17-2009, 04:21 AM   #13
andrewhans
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How worried am I since mine has been resurfaced twice now..... not a whole heck of a lot

Quote:
Originally Posted by teiva-boy View Post
Yes, it's recommended to buy a new one, try one of our vendors here fro the best price.

Granted folks and shadetree mechanics have gotten by with a light resurfacing...
BTW i went to the local Subaru dealership for some gaskets and seals and for shtis and giggles i asked about the price of their lightweight flywheel for the sti and he said in the neighborhood of 800ish, I just about died laughing lol
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