secondary ignition waveform

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eric989
OneWave
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Posts: 35
Joined: Fri Apr 16, 2010 6:53 am
Location: Hongke China

secondary ignition waveform

Post by eric989 »

Hi all. I tested a Buick 3.0 secondary ignition waveform and found that there should be a faulty.The "burn time " line have noisy. And the line won't drop to 0 after "burn time". Can somebody tell me what cause these ?
Many thanks.
Eric
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Eric Chen
Hongke Technology,China

Liteace
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Re: secondary ignition waveform

Post by Liteace »

What type of ignition system does it have ?
Ive never had any luck testing secondary ignition, Ive never seen a waveform look like it's supposed to look
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eric989
OneWave
OneWave
Posts: 35
Joined: Fri Apr 16, 2010 6:53 am
Location: Hongke China

Re: secondary ignition waveform

Post by eric989 »

Liteace wrote:What type of ignition system does it have ?
Ive never had any luck testing secondary ignition, Ive never seen a waveform look like it's supposed to look
it's DIS. One coil for two cylinders. Four cylinders.
Eric Chen
Hongke Technology,China

Alan
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Joined: Thu May 25, 2006 8:02 am

Re: secondary ignition waveform

Post by Alan »

I am no expert on ignition but that looks OK to me.

A bit of noise on the firing line is not unusual - its possibly caused by ionisation effects?

The signal can also take a while to drop back to zero - when the voltage drops below a few kV the spark stops but there is still some voltage present which will "leak away" over time. I have zoomed in on your waveform to show this. As the voltage was zero before the ignition event its pretty safe to assume it will be back to zero before the next one.
501a7e29.jpg

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