i had the same noise but mine only happened when the heater was on and I pressed on the gas. And then it was only for a fraction of a second. Found out it was the drive (serpentine) belt and replaced it. All good to go now.
95 Mystique GS Zetec ATX: Dead - Dec 5th, 2003
94 Accord LX 2.2L MTX Non-Vtec. Few bolt ons.
02 Escape XLT 3.0 V6 ATX. This thing has the CD4E in it?! What the hell was ford thinking?
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