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I used to think the old school timing light was fine, but a scope changed my mind
I had this 2005 Civic with a weird misfire that wouldn't show a code. Spent like two hours with my basic inductive timing light, checking and rechecking, and everything looked okay. My buddy loaned me his four channel scope for a day, and we hooked it up. Seeing the actual secondary ignition pattern showed a weak spark on cylinder 3 that the light just couldn't catch. Fixed it in twenty minutes after that. I mean, the light is still good for basic static timing, but for real diagnosis, the scope is just on another level. Anyone else made the jump to a scope and been surprised by what you find?
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