Topics that apply to all 92-95 civics
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By yashep
#37717 TBs always makes a hissing sound, it sucking up air so your engine could run. if its sound really loud you might want to check to see if the intake hose has a hole or is not completly sealing the TB part, but as everybody else said if your idle is normal and no check engine its ok.
By PininFarina456
#37734 Thanks for the info guys, I really appreciate it.

The hissing sound can only be heard when I open the hood.

If the hood is closed, if I have my window down, or from the interior, I can't hear anything. And the car runs great. :)