The Autonerdz Community Forums - secondary ignition waveform

bangshout Freshman Member Offline Posts: 23 south yorkshire United Kingdom Gender:	secondary ignition waveform Mar 25^th, 2012 at 1:39pm Well here is my first go at grabbing a secondary waveform using my hameg 40 mhz scope. not the full wave but just a segment, my limited experience says something is wrong, with the coil etc the car is a 1994 Volvo 850 2.0 litre 20 valve time 200 microseconds volt .5 volt
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PRESTON LSD Guide Picogroup Offline "Fix like a champion today" Posts: 4,959 Jensen Beach Florida USA Gender:	Re: secondary ignition waveform Reply #1 - Mar 25^th, 2012 at 2:31pm Wow, I wouldn't even know where to start...other than to tell you I have an OTC Solarity for sale
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bangshout Freshman Member Offline Posts: 23 south yorkshire United Kingdom Gender:	Re: secondary ignition waveform Reply #2 - Mar 25^th, 2012 at 3:50pm My first time at capturing secondary signals,Im well out of my comfort zone,but I like a challenge
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PRESTON LSD Guide Picogroup Offline "Fix like a champion today" Posts: 4,959 Jensen Beach Florida USA Gender:	Re: secondary ignition waveform Reply #3 - Mar 25^th, 2012 at 4:14pm Thats a very good attitude, it's just that I haven't looked at a scope screen like that in years. I don't know what to make of that capture either, maybe some of the older guys would know, he he he
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J Leonard Freshman Member Offline Posts: 48 Cork County Ireland Gender:	Re: secondary ignition waveform Reply #4 - Mar 26^th, 2012 at 2:15am one thing... Why is the picture mirrored?
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bangshout Freshman Member Offline Posts: 23 south yorkshire United Kingdom Gender:	Re: secondary ignition waveform Reply #5 - Mar 26^th, 2012 at 6:21am I was just matching it up to waveform examples
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Kev Freshman Member Offline I'm an Autonerd Posts: 2 Liverpool Great Britain	Re: secondary ignition waveform Reply #6 - Jul 17^th, 2012 at 1:27pm bangshout, What are you doing!!! You can't monitor secondary ignition with that scope, you will destroy it! There are special probes that fit to that type of scope to monitor high voltage. C'mon get a grip! Kev
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jayfly

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Re: secondary ignition waveform
Reply #7 - Jul 18^th, 2012 at 1:04am

Kev wrote on Jul 17^th, 2012 at 1:27pm:

bangshout,
What are you doing!!! You can't monitor secondary ignition with that scope, you will destroy it! There are special probes that fit to that type of scope to monitor high voltage. C'mon get a grip!

Kev

I don't think there was any need for the "C'mon get a grip!" was there?, everyone starts somewhere, so the explanation about additional probes you give would have done on its own.
well that's my opinion anyway.
Regards

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Tom Roberts Autonerdz Administrator Picogroup Offline Autonerdz Founder Posts: 8,595 Olympia Washington USA Gender:	Re: secondary ignition waveform Reply #8 - Jul 18^th, 2012 at 8:23am jayfly wrote on Jul 18^th, 2012 at 1:04am: I don't think there was any need for the "C'mon get a grip!" was there?, Indeed not. Reminder for Kev..... http://www.autonerdz.com/cgi/yabb2/YaBB.pl?num=1094423353
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Kev Freshman Member Offline I'm an Autonerd Posts: 2 Liverpool Great Britain	Re: secondary ignition waveform Reply #9 - Jul 18^th, 2012 at 10:48am OK I think it may have been taken out of context, where I come from it is considered 'humour', and that was exactly how it was meant. So if my regional humour offended anybody please accept my appologies and get a grip! Only kiddin! Kev
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bangshout Freshman Member Offline Posts: 23 south yorkshire United Kingdom Gender:	Re: secondary ignition waveform Reply #10 - Jul 18^th, 2012 at 12:22pm Finally had another go at capturing secondary ignition waveforms,while work is quiet. Again this is my 1994 volvo 850 2 litre,to my inexperienced eye the kv of the firing line looks a bit high,and the burn time a bit short,maybe a partially blocked injector. The image was captured at idle
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crackerclicker

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Re: secondary ignition waveform
Reply #11 - Jul 18^th, 2012 at 8:03pm

bangshout wrote on Jul 18^th, 2012 at 12:22pm:

to my inexperienced eye the kv of the firing line looks a bit high,and the burn time a bit short,maybe a partially blocked injector

since the pico has made me lazy, i'll need your help deciphering the x and y scales. looks like it is set to 100v per division vertical, and 2ms per division horizontal, right?

i'm guessing your using some sort of secondary probe that doesn't show the kv scaling on the scope. so, i figure (depending on the zero line) somewhere around 450 volts equals 4.5kv. sound about right?

then, it looks to be somewhere in the neiborhood of 1.7 to 1.8 ms burn time. that's pretty normal.

if i'm reading it right, this waveform seems ok to me. you'll find the dirty injectors by capturing secondary during a "snap throttle". quickly press and release the pedal from wide open throttle to closed throttle. then review your waveform for the very high "nose" on the end of the burn time.

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