Light weight crank pulley misfire?
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This is a discussion on Light weight crank pulley misfire? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hey I recently installed a grimmspeed lightweight crank pulley and my wrx now seems to have a slight misfire at ...

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    Light weight crank pulley misfire?

    Hey I recently installed a grimmspeed lightweight crank pulley and my wrx now seems to have a slight misfire at idle and around 3,000 rpm but seems to run smoother on hard pulls not sure if this is a common problem or not
    Plz give advice?

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    Quote Originally Posted by Nicklovin42 View Post
    Hey I recently installed a grimmspeed lightweight crank pulley and my wrx now seems to have a slight misfire at idle and around 3,000 rpm but seems to run smoother on hard pulls not sure if this is a common problem or not
    Plz give advice?
    If it's a bugeye, the issue is known.

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    Pro Manscaper Mikie13's Avatar
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    A lot of lightweight crank pulleys are known to cause issues like that to occur.

    What year/model/mods?
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    Yup it's 2002 bugeye **** me well at least I now know the issue looks like ill be taking it off

    If anyone wants the pulley email me nelsonn0042@hotmail.comand ill give it to you

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    Moderator Donkey's Avatar
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    Quote Originally Posted by Nicklovin42 View Post
    Yup it's 2002 bugeye **** me well at least I now know the issue looks like ill be taking it off

    If anyone wants the pulley email me nelsonn0042@hotmail.comand ill give it to you
    There is a misunderstanding here. The pulley does not actually cause real misfires. It just causes a misinterpretation by the ECU. The car should run no different performance wise. If it is then it is something else.
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    Registered User nsibanez's Avatar
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    exactly^
    all the lightweight pulley is doing is allowing your crank to rotate easier due to it being lighter of course. if the weight difference is too much, it will just throw a code because it thinks its misfiring when in reality its not

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    I have the Grimmspeed pulley installed on a 2013 WRX, with no issues. Have it on for about 7K miles. Engine felt smoother after install.

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