The Autonerdz Community Forums - Secondary waveform test #2

BowtieBob Freshman Member Picogroup Offline I'm an Autonerd Posts: 9 Southern Virginia Virginia USA Gender:	Secondary waveform test #2 Oct 2^nd, 2012 at 6:21pm This is a secondary waveform with the correct polarity. Car is a 1999 Chevy Cavalier 2.2 engine with 212,000 miles. (just posting to get familiar with correct way to post)
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PRESTON LSD Guide Picogroup Offline "Fix like a champion today" Posts: 4,961 Jensen Beach Florida USA Gender:	Re: Secondary waveform test #2 Reply #1 - Oct 2^nd, 2012 at 6:54pm Looking good...
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BowtieBob Freshman Member Picogroup Offline I'm an Autonerd Posts: 9 Southern Virginia Virginia USA Gender:	Re: Secondary waveform test #2 Reply #2 - Oct 2^nd, 2012 at 7:03pm Thanks Preston, do you notice anything unusual in the waveform?
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PRESTON LSD Guide Picogroup Offline "Fix like a champion today" Posts: 4,961 Jensen Beach Florida USA Gender:	Re: Secondary waveform test #2 Reply #3 - Oct 2^nd, 2012 at 7:32pm Not really, should I?
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Tom Roberts Autonerdz Administrator Picogroup Offline Autonerdz Founder Posts: 8,598 Olympia Washington USA Gender:	Re: Secondary waveform test #2 Reply #4 - Oct 2^nd, 2012 at 7:58pm Is it realy firing at just over 3 KV? That's a LOT of sample rate so there is a bit of noise that makes it look higher but a zoom zoom shows about 3.4 KV....
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PRESTON LSD Guide Picogroup Offline "Fix like a champion today" Posts: 4,961 Jensen Beach Florida USA Gender:	Re: Secondary waveform test #2 Reply #5 - Oct 2^nd, 2012 at 8:02pm I never thought to zoom in on it Tom, from out here it looked like 9kv and I didn't think much about it, plus the burn looked pretty good, just over 1ms.
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Erik_1940 Guru Member Picogroup Offline Elevation 25 ft Posts: 406 California California USA Gender:	Re: Secondary waveform test #2 Reply #6 - Oct 2^nd, 2012 at 8:11pm
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RtOne Super Nerd Picogroup Offline "If We Can't Fix It" - "It Ain't Broke" Posts: 657 Westville, Illinois Illinois USA Gender:	Re: Secondary waveform test #2 Reply #7 - Oct 3^rd, 2012 at 10:09am Tom and Preston, What you guys are referring to is the point where the mixture ionizes and the fire lights, (Spark Jumps the Gap) ? Then the voltage will drop to a level where the fire stays lit ?
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PRESTON

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Re: Secondary waveform test #2
Reply #8 - Oct 3^rd, 2012 at 10:51am

RtOne wrote on Oct 3^rd, 2012 at 10:09am:

What you guys are referring to is the point where the mixture ionizes and the fire lights, (Spark Jumps the Gap) ?

Yes, I call that the firing KV also known as the spark KV ( at least in my head ).

RtOne wrote on Oct 3^rd, 2012 at 10:09am:

Then the voltage will drop to a level where the fire stays lit ?

I call this section the burn KV

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RtOne Super Nerd Picogroup Offline "If We Can't Fix It" - "It Ain't Broke" Posts: 657 Westville, Illinois Illinois USA Gender:	Re: Secondary waveform test #2 Reply #9 - Oct 3^rd, 2012 at 1:49pm Thank you Preston, I've never had occasion to zoom in that close, (the Sun I Trained on 30+ years ago couldn't) so I never knew the value. Nomenclature being of the essence, I thought I'd better get on your page. I'll watch a few more to see if that second dip is a common on the Burn KV Line, while zoomed in that far.
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BowtieBob

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Re: Secondary waveform test #2
Reply #10 - Oct 3^rd, 2012 at 5:37pm

Thanks for all the input, this helps me in understanding more about diagnosing the waveform. One question that I have is what would be a good sample rate to use to capture the best picture? A little bit of info on the car.... it has no codes, no drive-ability problems, other than the customer complained of slightly lower fuel mileage, and slight loss of power, but says the car runs smooth with no misfires. Thanks again for your input

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Mick LSD Guide Offline I learn every day Posts: 7,471 Toronto 400ft Ontario Canada Gender:	Re: Secondary waveform test #2 Reply #11 - Oct 3^rd, 2012 at 6:11pm BowtieBob wrote on Oct 3^rd, 2012 at 5:37pm: One question that I have is what would be a good sample rate to use to capture the best picture? 1MS/s You will find the answer to your question in the Picogroup area.
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BowtieBob Freshman Member Picogroup Offline I'm an Autonerd Posts: 9 Southern Virginia Virginia USA Gender:	Re: Secondary waveform test #2 Reply #12 - Oct 4^th, 2012 at 5:25pm Thanks Mick for your response
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