See my post in this thread... it describes what the noise sounds like in detail (others have agreed that this is a good description). The screw beating around in the cylinder makes a HORRIBLE racket that's unmistakable. However, if it's just a loose VTCS or VICS butterfly rattling around, I suppose it could make the noise you're referring to.
In a lot of cases, the screw hits the spark plug, and your car will throw a CEL.
There isn't a really easy check for this. If your screw was beating around on top of the piston, there will be some evidence. Ask your dealer to pull your plugs and borescope the cylinders to look for evidence of scratching or pitting on the cylinder walls or the piston.