Ignition Coil Resistance
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This is a discussion on Ignition Coil Resistance within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Does anyone know the resistance in ohms for an ignition coil for an '03 WRX? I have researched this via ...

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    Ignition Coil Resistance

    Does anyone know the resistance in ohms for an ignition coil for an '03 WRX?

    I have researched this via the web but have found out the resistance can only be found in the vehicle repair manual. Can't find a repair manual for an '03 and can't find the resistance for the coils of an '02 or '04. I haven't called a dealer to find out, but hesitant to do that.

    What I'm trying to do is test the resistance with a multimeter. Have seen posts where some say it's not possible with these ignition coils but I still want to give it a try. Also I have heard that the ignition coils last for a long time. However, don't know if mine have been replaced by the previous owner(s) and I'm pushing 109k therefore I'm thinking at least one might need to be replaced due to an ignition coil/wire test I ran.

    Any useful info would be appreciated.

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    From factory manual

    C: INSPECTION
    Ignitor is integrated with the coil. Therefore resistance
    cannot be measured


    If you are getting a CEL, it will be specific to one cylinder. Try switching components to see if you can get the CEL to track the component to troubleshoot. If you are not getting a CEL and the car runs fine, I'd just put everything back together.
    WRX Info Links, Courtesy TheJ
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    Thanks for the info. Saves me the trouble from pulling those hard-to-reach buggers out.....again.

    BTW, would a slight hesitation from 500 - 2000 rpm be caused by bad fuel injectors or possible a bad PCV valve?

    PS: no CELs, just the hesitation.

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    He simply abides. SD_GR's Avatar
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    The stock tach cannot measure 500 rpm and the car does not idle at 500.

    I'd like to think that an ignition-related hesitation would generate a CEL, and that a clogged PCV would increase oil consumption. Likewise, a vacuum leak ought to also generate a CEL -- but in any case that's were I'd start just because it seems somewhat reasonable. Just an opinion.
    WRX Info Links, Courtesy TheJ
    Man is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis Zorbas
    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
    DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

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    Thanks SD_GR,
    That is a good guess because I am using oil and I am at the cusp of changing the PCV valve which is (I'm assuming) older than dirt. I'll examine the hoses to see what I've got. Glad to know for now that it's not either the injectors or the coils.

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    Quote Originally Posted by spacebarcode View Post
    Does anyone know the resistance in ohms for an ignition coil for an '03 WRX?

    I have researched this via the web but have found out the resistance can only be found in the vehicle repair manual. Can't find a repair manual for an '03 and can't find the resistance for the coils of an '02 or '04. I haven't called a dealer to find out, but hesitant to do that.

    What I'm trying to do is test the resistance with a multimeter. Have seen posts where some say it's not possible with these ignition coils but I still want to give it a try. Also I have heard that the ignition coils last for a long time. However, don't know if mine have been replaced by the previous owner(s) and I'm pushing 109k therefore I'm thinking at least one might need to be replaced due to an ignition coil/wire test I ran.

    Any useful info would be appreciated.
    i dropped one of my coils and i dont remember which one and the car will not stay running...wen i tested the ohms i got 5.24 from one and 34.67 from another so im guesing the 5.24 is the bad one..mine is also an 03 and i just hit 108k and theyve never been changed

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    jerzeyninja, how did you test your coils? I tried with a multimeter but got nothing and a lot of users are saying that it's not possible.

    thanks for the help.

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