need help with ignition system.

[malloynx]

here is the deal. today i put my car on the ignition scope and my firing line voltage (Kv) is really low. the average was around 1.5kv with is low. usually the standard is 5-15kv on most vehicles with a max of 3kv between the cylinders.

also the coil osciliation was weak. the spark line check out ok with an average of 1.3ms; which isn't too bad. usually 1.5 is the norm, but i run a tight plug gap.

my coil packs are original and i think they are on there way out. my primary igntion sucks..

does anyone know how much KV the coil should be putting out to read on the firing line of the scope?

 

[Joel W.]

I am looking in my book and it references approx. 20 to 35 kv to conventional EFI , For distributor-less-Ignition it does not say.

Maybe Jetjock can shed some light on this.

 

[jetjock]

The firing line should be 6-8kv for a .035 gap and a normal mixture. Plug gap effects the firing line, not the spark line. I find 1.5 kv hard to believe. If that's an average of firing line kv what is the average of the spark lines? What is the max firing line kv obtained during a snap throttle test? How many coil oscillations?

 

[malloynx]

YEA, i'm not BSing with the firing line. they were around 1.5kv to 3xxxxkv. i had only a bit of time to hook it up. and go through to patterns. I used the parade pattern to get my firing lines and i messed with the raster patern on for a bit.

i was pressed for time, and i did it fast. but went i put in on parade they were all reading pretty low. i only had the scale up to 5kv and no of the cylinders made it to the top

 

[Nick M]

Do you suspect an electrcial missfire?