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Old 03-20-2004, 10:36 PM   #1
lupohki
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Member#: 3457
Join Date: Jan 2001
Chapter/Region: MAIC
Location: Herndon, VA
Vehicle:
2008 STi
DGM

Default Help ... getting a humming and static sound from engine bay. SOLVED

There's moderately loud noise coming from the area circled in blue. It's a constant humming sound and on top of it are some static sounds that don't fit a pattern. I can hear it when I turn the ignition half way. The engine, when started, drowns it out though. I undid my grounding kit and amp/head unit power line (in yellow) and still get the noise. I'm not sure when it started. I also have a Valentine 1 hardwired to the overhead lights, but i doubt that would be the cause. From looking at the service manual, the manifold absolute pressure sensor is located there, but I can't say that's making the noise. Any advice? Thanks.

update Asked at the STi forum and seems it's normal for the throttle controller to do that. Thanks for the suggestion Mulder!

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Last edited by lupohki; 04-17-2004 at 12:56 AM.
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Old 04-16-2004, 09:26 PM   #2
lupohki
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Default

Ok, I know exactly what's making the noise now. It's the gadget labeled as (3) in the pic below. When I disconnect it, I don't get the noise. It's either the MAP sensor or the electric throttle. The manual that I have is inconsistent in referencing what that is.

Can someone tell me what that is, and what might be causing it to buzz? Maybe it's just going bad?

Thanks.

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Old 04-16-2004, 11:31 PM   #3
Mulder
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02 WRX
15 WRX/05 GTO

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That looks like the throttle controller for the "drive by wire" system. I don't know how much noise it's supposed to make but this may be normal. If you're concerned either take it by the dealer and ask them about it, or find another nearby STi owner to compare with (or both).
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Old 04-18-2004, 11:18 PM   #4
zumnwrx
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Location: modesto, ca
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white

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my wrx hums at idle also.. but i thought it was the bov..

nice to know this is normal

edgar,
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Old 04-19-2004, 07:10 AM   #5
Mulder
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02 WRX
15 WRX/05 GTO

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The WRX is not the same, no drive-by-wire module. They do make a bit of noise, but to determine if yours is normal you can do the same as I suggested above, compare with an identical car or ask your dealer.
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