Hello,
Monitoring primary I think there isn't autoinduction sometimes,also freq(b) have some strange variations
Replace cop and repeat the test on cyl 1.
Sorry, after a second look, the coil firing doesn't look that random actually, especially if you look at the current ramps at lower RPM (~1000 rpm). I can't say that they are "on time", because I don't have a similar engine to compare (maybe in pico library, didn't check), but I guess the timing between fires and the number of fires in this system may be normal...
But, as I have said before, because of the low sample rate (20 ks/s) I believe we can't conclude anything from that primary ignition waveform.
Hello,
In my opinion the marked firing voltage is a misfire event(the firing voltage isn't at drop of coil curent,a short burning time,but at 700 us after we have strong oscilations?)
And 20 Ks/s will give a resolution at 100us,enogh for the analyze of firing voltage and spark line.
Of course a higher sample rate is good but the saved file will be too large...
Regards
20 ks/s will give a 50 us resolution, that is not enough to give a clean firing voltage.
If you measure the peak event time, like in the example from pico, that event will only last for 15 us, at most. I have checked in some primary voltage readings I have made, and the 15 us stands.
Obtaining the peak voltage with 20 ks/s is a probabilistic event. You have a 30% chance to just make a measurement inside that 15us window. Obtaining something close to the peak voltage, It will have a much lower than that probability.
If you want, for instance, just 5 poins to draw that peak, you will need to have a resolution of at least 3 us. 17 times more than the 20ks/s.
Hello,
Thank you for the firing voltage explanation...is the first time when I see this event recorded at high sample rate
In many ignition diagnostic manuals I see scope with settings at 20-50v/div and 1ms/div for primary voltage waveform.
Back to the topic:inspect if the spark plugs is ok,not matter if is new or not(wrong spark plugs,faulty spark plugs)
Also try to register total(short+long fuel trim) or injectors curent.
Regards