Lumpy idle
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This is a discussion on Lumpy idle within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; I have a new 2013 WRX with 550 miles on it. I've noticed it has a Lumpy idle when cold ...

  1. #1
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    Lumpy idle

    I have a new 2013 WRX with 550 miles on it. I've noticed it has a Lumpy idle when cold you can feel the car shaking. It's not a missing plug I don't think it revs fine and drives fine. Let it idle when warm and it'll miss every now and then. I had this on my SVT Lightning it was just he nature of the NGK plugs. I'm assuming its the same with the WRX. Just checking to see if this is normal. Only mods are a drop in K&N and Nameless Performance axle back muffler delete.
    Jeff

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  3. #2
    MAINEiac 11blackSTi's Avatar
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    Hmm...axle back wouldn't really change much, but the K&N maybe. How does it idle after it has warmed up and how long do you notice the "lumpy idle?"

  4. #3
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    It idles fine when warm just the random miss from time to time. My wife's car 2012 Impreza sport 5 door does the same thing when cold so it may be normal. I know different engines 2.0 vs 2.5. It's done this since day one before K&N and exhaust.
    Jeff

  5. #4
    MAINEiac 11blackSTi's Avatar
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    Given the age of the car I would think it is ok. Maybe have the dealer take a look since it is so new. They don't like the cold. Are you running the stock tune?

  6. #5
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    Yes stock tune right now waiting on 1000 miles to reflash to stage 1 with my Accessport.
    Jeff

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