It's not really a trick, but it does work pretty trick. Just get about 3 feet of 5/8" heater hose, and use it like a one ear stethescope. Put one end to your ear, and move the other around until you find the noise. It will become much louder when you get near it. Move the hose around the exhaust ports, etc. If that's where it's coming from, you'll know.
Take care,
-Chris
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