"supercharger" noise?
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This is a discussion on "supercharger" noise? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; With the colder weather setting in my WRX has started making a strange supercharger-like whine before it has warmed up ...

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    Registered User ArchangelF16's Avatar
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    "supercharger" noise?

    With the colder weather setting in my WRX has started making a strange supercharger-like whine before it has warmed up to operating temperature and it seems to follow engine RPM. I haven't noticed any changes in performance and no CELs were thrown. Anybody have ideas what this could be?

    Car is an 06 WRX sedan, stage 2 pro tune with ~125k miles on it.
    2004 White WRX (R.I.P.)
    2006 White TR replacement
    1998 V5 Grey STi

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    He simply abides. SD_GR's Avatar
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    Could be something external on the front of the engine like the A/C belt, steering belt, or their rollers.
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    Registered User DorBink's Avatar
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    I had similar on my 04. Turned out the belts needed replacing and ac motor.

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    Village Idiot McBill's Avatar
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    I vote some sort of belt driven accessory, possibly power steering. Mine is loud on cold startups on my '11.
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    Registered User Aaronw9's Avatar
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    My 07 does the same thing. I think it's the secondary air pump. Mine is stuck closed so it makes a bit more of a noise. Going to delete it eventually. It has only been noticible lately for me because the weather has gotten down into the 20's.

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    Registered User ArchangelF16's Avatar
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    Quote Originally Posted by Aaronw9 View Post
    My 07 does the same thing. I think it's the secondary air pump. Mine is stuck closed so it makes a bit more of a noise. Going to delete it eventually. It has only been noticible lately for me because the weather has gotten down into the 20's.
    Are you throwing a CEL with that? I had my secondary air switching valve stuck closed (and replaced the valve) about a year ago and haven't had the CEL come back. And yes, the outside temps have been dipping into the 20's and low 30's the past week.
    2004 White WRX (R.I.P.)
    2006 White TR replacement
    1998 V5 Grey STi

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    Registered User Aaronw9's Avatar
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    I have 2 cel's for the air pump. One says its stuck closed and the other says secondary air malfunction. I will be pulling the fuse to the system later tonight so it doesn't even try to run and see if that stops the noises. I have the cel's turned off with my AP.

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