ALOT of shaking at idle
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This is a discussion on ALOT of shaking at idle within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; just started today my cel has been on since i put my catless downpipe on. today it started shaking alot ...

  1. #1
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    Red face ALOT of shaking at idle

    just started today my cel has been on since i put my catless downpipe on. today it started shaking alot and it seems to be pushing alot of boost at low rpm and now my cel is flashing. the engine is moving quite a bit too. and the exhaust sounds like its sputtering. no boost gauge in the car.. but my blow off valve has never been that loud at low rpm.. any ideas????
    03 wrx

    list of mods:
    Injen SES catback exhaust
    Injen coldair intake
    HKS catless downpipe
    HKS ssqv III blowoff valve
    Grimmspeed crossover pipe

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    and when at a stop my rpms drop real low like its gonna stall but doesnt...

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    Registered User littlerussian's Avatar
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    if ur check engine is flashing, it means ur cylinders are misfiring. That means its either a fuel problem or an air problem. my car used to shake at idle too, and the check engine started to come up and flash, the car kinda revved up and down a little on its own too without me pushing on the gas. My problem was a ripped intake manifold gasket. Most likely ur problem too. Or it could be a fuel injection problem. But check ur intake manifold gaskets. there's 4 total, 2 on the right side, one sitting right under the manifold, and another one, the most likely one to be causing this problem, is a bit lower, sitting on top of the cylinders, and 2 more just like that on the left side.
    06 WRX TR: stage 2 cobb, HKS TBE, K&N air filter in stock box

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    The Default One SeattleJeremy's Avatar
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    Wow, where to start.

    Your car needs to be tuned to run a catless downpipe, so it's running lean.

    Your car needs to be tuned to run the Injen cold air intake because the MAF sensor housing isn't designed correctly, causing it to run lean.

    Subaru's are setup so the extra air is recycled back though the intake, and using a BOV (vent to atmosphere) makes it run rich between shifts.

    If the engine is moving as much as you say it is then you may also have a problem with your engine mounts.

  6. #5
    Admiral Ackbar mycologist's Avatar
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    Don't worry about the DP - it is a bugeye and that is fine.


    Remove the intake and put on a stock one or get tuned.


    Clean the MAF and see if that solves the idle etc.
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

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    the intake has been on for a couple months now with no problems..

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    Quote Originally Posted by BKassela View Post
    the intake has been on for a couple months now with no problems..
    So you've data logged with a wideband sensor then?

    That's what I though.

    And how exactly are you running "a lot of boost at low rpm"?

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    The Default One SeattleJeremy's Avatar
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    Quote Originally Posted by BKassela View Post
    03 wrx

    list of mods:
    Injen SES catback exhaust
    Injen coldair intake
    HKS catless downpipe
    HKS ssqv III blowoff valve
    Grimmspeed crossover pipe
    While you where under there, did you also install an uppipe?

  10. #9
    UnBanned Sinister's Avatar
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    I really think it's the blow-off valve. Especially if it feels like it's going to stall while at idle. That's a common symptom for a junk BOV, or one that hasn't been properly adjusted.
    Kevin
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    stock uppipe(for now) and the bov has been on for months too no problems..if its misfiring then those parts shouldnt have anything to do with that. all my mods have been on for atleast 3 months.

  12. #11
    The Default One SeattleJeremy's Avatar
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    Ok. Let me start over.

    Your check engine light is on. Use an ODB-II scanner to find out what the codes are, then post the codes.

  13. #12
    Registered User littlerussian's Avatar
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    like i said, theres probably a small leak somewhere, my car used to drop to very low rpms too at stop just like urs, but didnt stall, then after a few weeks it actually began to stall every once in a while when i stopped or put it in neutral. As soon as that started happening i took it to my mechanic, i had a hole in one of my manifold gaskets. i'll even send you a pic. After he replaced that, no more problems at all, and the cel turned off.
    Attached Thumbnails Attached Thumbnails 2009-11-02 15.39.17.jpg  
    06 WRX TR: stage 2 cobb, HKS TBE, K&N air filter in stock box

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    come monday i'll have a odb-II scanner and i'll let you know what i come up with.. from the sound of my intake and bov its getting too much air. i live on a military base and the closest auto store is like 10-15 miles away so i dont chance driving it right now. after christmas its getting pro tuned just need to find a good place. anyone in colorado know a good place on the east side of CO?

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    P0420 my cat is the only code it came up with could it be my O2 sensor messing everything up?

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    Admiral Ackbar mycologist's Avatar
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    Quote Originally Posted by BKassela View Post
    P0420 my cat is the only code it came up with could it be my O2 sensor messing everything up?
    It could be but the symptoms are weird. The rough idle matches at least. In any case, you must get that fixed immediately.
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

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