If the spark line is totally flat, is longer than 2 ms, and is less than 500 volts, there is a good chance that:
A)the plug is not firing
B)the air/fuel ratio is excessively lean
C)there is high resistance in the spark plug wires
D)the spark plug heat range is wrong for the engine

Question

Quizplus · Accepted Answer

A flat spark line indicates that the spark plug is not firing, as there is no voltage change typically associated with a firing event.

If the Spark Line Is Totally Flat, Is Longer Than