New Subaru Owner Wrx Engine Question
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This is a discussion on New Subaru Owner Wrx Engine Question within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hell all, Just got my first Subaru ever, have always owned a Honda, but have been less than satisfied with ...

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    Registered User Behaviorist's Avatar
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    New Subaru Owner Wrx Engine Question

    Hell all,

    Just got my first Subaru ever, have always owned a Honda, but have been less than satisfied with there new lineup. I picked up a 2014 wrx hatch at the stealer. My question is while the car warms up and does it's idle thing it seems to sway in the cabin (left to right) just enough to notice. Is this normal and the nature of the motor? I assume it's just the beastly motor under the hood doing it's thing. (There are no cel, and do not seem violent in any manner like a misfire) However, like I said I am new to Subaru so I really have no clue. Thanks for the help in advance to those who can offer guidance.

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    Registered User SKI.WRX's Avatar
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    Does it smooth out with throttle? In my 02 you can feel the idle in the car. Shakes side to side a bit but smooths out with a little throttle. the unequal length headers that give the "boxer rumble" also create a bit of a rough idle.

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    What you describe is not abnormal. My early car does this also.
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    Registered User Behaviorist's Avatar
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    It's smooth while driving, and giving it throttle. It really is just slight. I'm probably being anal, but then again was worth an ask to people who have been doing Subaru for a length of time.

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    Registered User wreckingball man's Avatar
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    Mine feels that way too at idle. U can feel a little shimmy shimmy.

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    Registered User wrxnguyen's Avatar
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    Don't feel that in my 13 wrx hatch... At least I don't notice it...

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    The boxer motor has no balance shafts due to the design. This is because the boxer motor does not have any inherent primary vibration. However, there is a lesser secondary vibration that occurs around the crankshaft and is a 2nd order vibration (2 full amplitudes per crankshaft rotation). This secondary vibration manifests itself in the form of a slight "rock" at idle, and is likely what you've experienced.

    FYR, this "rock" will smooth out of idle because the relative amplitude of the vibration will decrease with increasing frequency (RPM). At high RPM, this secondary vibration will manifest itself as slightly perceptible NVH.
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    Registered User Stunna02's Avatar
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    Quote Originally Posted by zax View Post
    The boxer motor has no balance shafts due to the design. This is because the boxer motor does not have any inherent primary vibration. However, there is a lesser secondary vibration that occurs around the crankshaft and is a 2nd order vibration (2 full amplitudes per crankshaft rotation). This secondary vibration manifests itself in the form of a slight "rock" at idle, and is likely what you've experienced.

    FYR, this "rock" will smooth out of idle because the relative amplitude of the vibration will decrease with increasing frequency (RPM). At high RPM, this secondary vibration will manifest itself as slightly perceptible NVH.
    Well actually, you can have six hydrocoptic marzul vanes fitted to an ambaphascient luna wain shaft so that the side fumbling would be prevented. Most of the sway is produced by the modial interaction of magneto reluctance and capacitive duractance of the power generated. I think Subaru adopted a pre-famulated amulite surmounted by a malleable logarithmic casing so that the spurving bearings are run in directly line with the panametric fan.

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    Quote Originally Posted by Stunna02 View Post
    Well actually, you can have six hydrocoptic marzul vanes fitted to an ambaphascient luna wain shaft so that the side fumbling would be prevented. Most of the sway is produced by the modial interaction of magneto reluctance and capacitive duractance of the power generated. I think Subaru adopted a pre-famulated amulite surmounted by a malleable logarithmic casing so that the spurving bearings are run in directly line with the panametric fan.
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    I got my 13' about month ago or so and the shake is quiet normal but I never noticed a huge rock. Especially with the car you just have might have to be broken in a bit and still kind of new. My 13' settled down after a good break in period (1k miles). But my car started to rock a little more when i installed my CBE (catback exhaust) haha. Don't be too paranoid about the rock ... if it breaks ... subaru got your back (thats if you don't start modding it right away).

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    Registered User wreckingball man's Avatar
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    ^What he said.

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    ever seen a lightweight boxer stand still in the ring? always moving lol. subaru flat fours rock and 'cam' like a v8. we're cool like that.
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    Registered User Ingo's Avatar
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    Normal... (unless the center muffler bearing is ALREADY out of balance)
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    I agree with it being normal....to a degree. There are several threads on NOSIAC about the newer WRX/STi having excessively rough idle, and then they start throwing a code. Seems like there are some bad wiring harnesses out there causing a misfire. So I'd say keep an eye on it. If you throw a light, take it in right away and have them check the wiring harness.
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