rattling noise in engine

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I have a 1995 4runner and it just started to make a rattling noise in the engine. It sounds like a bolt rattling around in side. When it is idling I can not hear it but when I rev the engine it starts to rattle.

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When you say "inside" the engine, is that what you really mean? Take a screwdriver with a long shaft and a rounded end and put the blade on the valve cover(s) and put the round end of the handle in your ear. You've just made a makeshift stethoscope. Listen for anything going on in there. Have someone else rev the engine a bit while you listen with the screwdriver.

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