ooh, my wife hates that. I typically fix our cars myself when they break. When something starts making noise that I can't diagnose, I do everything I can to make it worse hoping it'll help me figure out the problem. Apparently, that's counter-intuitive.
My wife is far more analytical about most tasks than I am - I drive her crazy by not really being able to explain how I can fix most things, using a process she describes as "fiddling randomly until it works".
Your mechanic might hate that too. One difference between software and hardware is that you can't just revert the checkin that cracked your cylinder head when you were over-revving the engine to see if you could make the ping louder.