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spark plug, secondary ignition diagnostics

Dealer Service

Secondary Ignition Diagnostics

Somewhere in the study of ignition science, many of us come away with the idea that secondary ignition voltage, as expressed in kilovolts (kV), is the end-all, be-all of engine performance. We also come away with the idea that secondary ignition voltage increases only under “snap-throttle” conditions. 

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But not so fast on kV-only diagnostics. When diagnosing in-depth secondary ignition problems, we’ll find that kV demand can vary widely according to air/fuel ratio, running compression, and spark timing. That said, there’s more to ignition science than looking for the classic quarter-inch long “hot blue spark” jumping from coil secondary to ground. 

Click HERE for the full article from Dealer Service‘s sister publication, Underhood Service.

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