Flywheel/ Pulley Misfire CEL's...
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This is a discussion on Flywheel/ Pulley Misfire CEL's... within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Its finally happened to me, after quite a long time of running a ACT Streetlite Flywheel + Lightened Pulley... I ...

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    Registered User SonicYellowWRX's Avatar
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    Flywheel/ Pulley Misfire CEL's...

    Its finally happened to me, after quite a long time of running a ACT Streetlite Flywheel + Lightened Pulley... I guess I'm not so special afterall! No big deal though... clear the code and go on with life.

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    ive searched for the reasons why a flywheel would do that...but is there any substantiated evidence to this? i have a fidanza and have the misfires as well. annoying, but something i can live with :T

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    Registered User PolarisSnT's Avatar
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    How long were you running the setup?

    Its coming up on a year and 20k+ miles for me and I havent had a problem yet. I have the Exedy 13.9lb flywheel and Perrin Pulley.
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    Registered User le wagon's Avatar
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    how does your ACT flywheel weigh?
    EVO III 16g'd wagon
    stock tranny goin strong
    .. already ready for a bigger turbo
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    Quote Originally Posted by chanwahyaoh
    Sometimes after I go poo, I just blank out and mindlessly continue my upward wipe all the way up the small of my back and end up smearing brown all over myself. Just kidding. That sucks about your laundry though...

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    Registered User seth7685's Avatar
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    I don't think its the weight of the flywheel that cause the misfire. The ecu measure crack postion by the flywheel teeth and if something happens to these teeth, start grins them or something like that it will throw a cel.

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    Registered User SonicYellowWRX's Avatar
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    Quote Originally Posted by PolarisSnT
    How long were you running the setup?

    Its coming up on a year and 20k+ miles for me and I havent had a problem yet. I have the Exedy 13.9lb flywheel and Perrin Pulley.
    it was a lil over a year before it happened to me... but i noticed it was due to driving style... usually, i'd get a phone call and not drive correctly when it happens. sometimes its totally random. its been logged by my tuner and its fake misfire codes, so nothing to worry about. my ACT is a 13.9 lb unit... but it have a exedy 3 puck clutch which is also a lil lighter and then the cobb pulley...

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    Quote Originally Posted by seth7685
    I don't think its the weight of the flywheel that cause the misfire. The ecu measure crack postion by the flywheel teeth and if something happens to these teeth, start grins them or something like that it will throw a cel.
    whats crack position?

    the weight DOES cause issue, the decrease in time for decceleration is not matched to what the ecu is looking for.
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    Registered User le wagon's Avatar
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    Quote Originally Posted by testes1010
    whats crack position?

    the weight DOES cause issue, the decrease in time for decceleration is not matched to what the ecu is looking for.
    so if your car was tuned with a lightweight flywheel or pulley would it still cause an issue?
    EVO III 16g'd wagon
    stock tranny goin strong
    .. already ready for a bigger turbo
    - - - - - - - - - - -

    Quote Originally Posted by chanwahyaoh
    Sometimes after I go poo, I just blank out and mindlessly continue my upward wipe all the way up the small of my back and end up smearing brown all over myself. Just kidding. That sucks about your laundry though...

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    Quote Originally Posted by le wagon
    so if your car was tuned with a lightweight flywheel or pulley would it still cause an issue?
    tuning has nothing to do with it.

    misfire detection thresholds programmed into the ecu in order to adhere to obd2 standards do. i do not know if oem ecu tuners (ie, openecu, cobb, ecutek) have access to those values --and, if they do, if they know what to do with them.

  11. #10
    Registered User seth7685's Avatar
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    Quote Originally Posted by testes1010
    whats crack position?

    the weight DOES cause issue, the decrease in time for decceleration is not matched to what the ecu is looking for.
    crank position my bad on the spelling
    Last edited by seth7685; 09-08-2006 at 10:58 AM.

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