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View attachment 1716124764
Scope readings like this as one cylinder.
Times 8, all 8 cylinder ignition patterns should look the same for a good running engine. If there is one oddball pattern, then that is the one with a problem.
My cousin had a scope at his Union 76 Service Station in 1976.
Used to watch the live scope patterns on the screen as the shop mechanics were doing their tune ups. "Scope Check" was frequently written on the work orders.
They could also kill one cylinder at a time to hunt for a weak cylinder.
Can also do this test by pulling One wire at a time out of the distributor cap, to hunt for a misfire cylinder.
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