Some ignition coils are just better shielded than others. Honda coils come to mind, they usually don't produce a good waveform with an inductive secondary probe but most from American brands work just fine. It's hit or miss, learn as you go.
ok awesome great to know, a hyundai and tacoma i couldn't so im curious if there are any from that manufacturer that would produce a waveform. would the secondary ignition clip on wire and rpm inductive pick up accessories work better or no? EETM306A02,EETM303A05A
The best way I know of to obtain a secondary waveform on a well insulated ignition coil is to add a spark plug wire between the ignition coil and the spark plug.
I keep a handful of Chevy LS style plug wires for spark checking ignition coil cassettes like are equipped on some GM 4-cylinder engines. This way you can clamp right on the wire of the cylinder you want to scope.
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