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My 2011 does it and it has a supercharger. You can hear it separately from the supercharger whine. Don't know what it is...
 

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really?, nobody knows what this is?.

My car just got it too, sounds like supercharger but not very loud. It does it with the AC off and in neutral as well.
It the hamsters squealing with joy because they know your almost to the 6200rpm happy zone :coolnana:

/Mine does it too
//have no idea what it is
:tadts:
 

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153 Posts
Since multiple people explicitly hear it coming from the passenger side of the motor and from experiencing this on other toyota 4's, I'm going to guess it's serpentine belt/roller whine.
 

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Record the sound and post. That's the only way anyone can help descriptions of sounds are usually lacking.
 

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shay2nak
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24,989 Posts
It's the throttle body or whatever sensor is attached to it. at least on my car.
 

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shay2nak
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