Primary ignition trace noise? What is it?

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4 years 2 months ago - 4 years 2 months ago #36431 by PeterA
Waste spark 4 tower coilpack.

Ground clamp on the 12+v feed into the coil, then probe tip is on the wires -ve for 1+4 and 2+3.
In the videos and this picture I am probing coil2, the right side coil. But it does this on both coils.

I think it's just noise and EMF messing with the trace???

How can I fix that so that I get a clean trace? Unless of course there really is noise going into the coil primary and messing with it etc.





streamable.com/s/9ccp6/vvhnvj


streamable.com/s/hlz8i/odfdbx
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Last edit: 4 years 2 months ago by PeterA.

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4 years 2 months ago - 4 years 2 months ago #36467 by Andy.MacFadyen
Okay first of all the scope ground wire goes to block ground, scope +wire goes to control or negative side of coil.
Also unless you have an automotive scope that can survive voltage spikes connect through an attenutor.

Secondly you don't say what engine you are connected but it is a Ford? Many Fords have muti-strike ignition that fires an additional 3 or 4 sparks in the space of about 5ms below 1500 rpm after which it switches to single spark per firing event.

" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)



Last edit: 4 years 2 months ago by Andy.MacFadyen.

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