I've used the mechanics stethoscope and chassis ear to narrow down the possibilities of a source of noises, but sometimes you get a vibration you feel with a droning, or booming sound at certain rpm, or range and an underbody inspection is not conclusive..
Here is a good software source for diagnosing the source of vibration with an EVA (Electronic Vibration Analyzer). I'm surprised Snap On hasn't incorporate an EVA function into a portable oscilloscope ,it could have an external vibration pickup like an SPX/OTC?produced EVA , and could list and capture the 3 most prominent vibrations at the desired RPms you want to capture it, but because it's incorporated into the scope be able to graph an event so you could compare to the software graph. I think OTC makes most of the EVAs that dealers use and see some can be purchased used on Ebay in the $500 range
Here is a good software source for diagnosing the source of vibration with an EVA (Electronic Vibration Analyzer). I'm surprised Snap On hasn't incorporate an EVA function into a portable oscilloscope ,it could have an external vibration pickup like an SPX/OTC?produced EVA , and could list and capture the 3 most prominent vibrations at the desired RPms you want to capture it, but because it's incorporated into the scope be able to graph an event so you could compare to the software graph. I think OTC makes most of the EVAs that dealers use and see some can be purchased used on Ebay in the $500 range
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