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2002 MERCURY VILLAGER 3.3 ,secondary waveform burn line is very high intermittently, feels like it has a slight misfire, what could be the possible causes ? thanks
I got confused..... When you say burn line is high you actually mean that the burn line starts at a higher kv than normal? Or do you mean the burn time is higher than normal? Please clarify.
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Normally at idle expect a wide U shape although it will skip around because of the response to the O2 sensor switching.
With a wasted spark system expect lower spark and burn line voltages every other spark. You are best to set a voltage trigger high enough to be triggered only on actual firing events.
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