properly testing ignition coils ?

[sil]

i was looking through my crappy haynes manual and i didnt see anything about coil resistances or how to check them also googled and didnt find anything about the resistances or hwo to check them

can anyone explain the process?
and does anyone know the proper resistances @ 0 and 70 Deg F temperature ?

Thanks

edit* guess the coil packs are the same for most gm models and apps ?

[montess408]

set the ohmmeter on the rx1 setting
place one lead on each primary terminal primary resistance should be less than 10 ohms
set the ohmmeter on the rx1000 scale
connect one lead to any primary terminal and the other lead in or on the coilsecondary tower secondary resistance should be between 5,000and 25,000ohms
if the coil fails this test ,replace it

[torq455]

i thought resistance between the tower coils was supposed to be between 5-7K ohms.

[gserlenga]

yeah, mine read 5700 ohms at the secondaries when i checked them, i think 5-10k is within spec

[prophiseer]

Seeing as how this post was lost, I'll throw this link back up: (.pdf format)

Tech Tip

[sil]

OMG thanks
athough i did manage to figure out my problem, 1 tower #4 wasnt sparking

thanks for the reply, that was gold *right click save as* lol

[prophiseer]

no prob that's saved me from many a frustrating diagnosis in the shop

[sil]

let me get this strait.........


primary(paperclip stuck in bottom plug) to tower(Secondary) should read 5000-7000 ohms?

or is it tower-to-tower 5000-7000 ohms?

reason i ask is because im not getting anything, on primary-to-secondary tower test, on all 3 of my coils.....