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I have a 2005 Focus ST. I am getting what sounds like a whistle from the engine compartment. I seems like throttle body cause it just happens at certain times when the throttle is at a certain position open. Not certain rpm or speed just certain times with the throttle pressed a little. Anybody come across this? Is there a fix or just deal with it?
 

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After I installed a SRI i hear it, too. Just a whistle at part throttle as the air is squeezing between the butterfly and housing. I had a SOHC ranger that would do the same.
 
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