Stehoscope vs screwdriver - where did Paul mention it?

I remember in one of Paul’s videos - may have been Premium - he says the mechanics’ stethoscope is too sensitive, and a wooden-handled screwdriver serves to filter out extraneous noise eg adjacent injectors.

Can anyone remind me which of his videos this was in please? My searching has been fruitless.

I know the video you mean but can't recall anything to search on. However this image is the capture on a scope of the output of an electronic stethoscope held against one injector you can clearly see the trace of the sound signal from all 4 injectors on the fuel rail.


We did a very long thread on this topic it has potential as has considerable potential as a diagnostic technique www.scannerdanner.com/forum/diagnostic-t...ock-sensor.html#4445

Thank you, Andy. I did indeed see that interesting thread during my searches to find the video where Paul praises the merits of wood as a filter.