FYI: I had a similar setup back when the cars wee a bit more forgiving to
work on, actually had a hand wound coil that we would clip around each spark
wire and view the resulting waveform. Of course, sync was random since the
scope needed to capture it from the input signal. Worked fairly well to
diagnose shorted plugs or open wires. Of course I'm talking 66 Mustang, etc.
Yes, it was actually an EICO Scope, before we opted for the Heath-Kit
Automotive Diagnostic item that came out later. That way we did not need to
worry about over-loading the scope inputs, etc. Just remember, leave the
garage door open when running the flippin vehicle, Eh!! Good Luck
"CJT" wrote in message
...
meirman wrote:
I have an Eico kit oscilloscope, that I bought used about 25 years
ago. (In NYC, from the store on the NE corner of the streets one block
south of Chambers and one block west of Broadway.)

I'd like to use it to check the the sparkplug waves on my 6-cylinder
car. Is there anything special I need to do? I would just try it,
but the scope is buried deep under uncompleted projects and other
stuff. .

Meirman
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I assume that's just a normal 'scope, and not one intended for
monitoring spark plug voltages.

You need to limit the voltage the 'scope sees. Certainly _do not_
connect it directly to a plug. You can either use a HV probe
(probably worth more than the 'scope) or you might be able to rig
something up with inductive coupling and a neon bulb as a limiter.

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