Coil test - Chevy Impala SS Forum
 
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post #1 of 4 (permalink) Old 03-20-2017, 02:08 PM Thread Starter
HUF
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Coil test

Checked the resistance of the windings in the coil. All four were the same 8.9 kohm. Is this normal? I recall it was supposed to be 8.5 kohm.

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1995 Cadillac Fleetwood Brougham 118,XXX miles.
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post #2 of 4 (permalink) Old 03-23-2017, 06:07 PM
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Quote:
Originally Posted by HUF View Post
Checked the resistance of the windings in the coil. All four were the same 8.9 kohm. Is this normal? I recall it was supposed to be 8.5 kohm.
Maybe this will help?

testing coil on 93 LT1 - CorvetteForum - Chevrolet Corvette Forum Discussion

If not, try a Google search "how to test an lt1 coil" and see what you can come up with.

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post #3 of 4 (permalink) Old 03-24-2017, 07:24 AM
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Originally Posted by HUF View Post
Checked the resistance of the windings in the coil. All four were the same 8.9 kohm. Is this normal? I recall it was supposed to be 8.5 kohm.
using an ohm meter to check a high voltage coil will reveal only a serious failure. like a shorted or open coil. so that is not a good test.

my coil had arcing going on . in the dark engine on I could see flashes on the coil body . then when I removed it I could see carbon tracking which in my case about 1/8 inch in size. replacing the coil increased the voltage which then cause the engine under load to put out max HP... at idle it was not noticeable..

these failures of coils will not always be the same so my failure my not be the same as yours so the engines issues my very well be different..

I do have a device that creates high voltage to test for insulation break down . this would be the testing to do you place the high voltage on the coils and see if it indicates any current leakage to the frame of the coil mounting.

I changed the coil and the ICM .
I took a trip down south jan/feb. used my new truck. when I came back after 2 months the Impala started up on the first crank just like I used it the day before ..
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post #4 of 4 (permalink) Old 03-24-2017, 05:40 PM Thread Starter
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Quote:
Originally Posted by j cat View Post
using an ohm meter to check a high voltage coil will reveal only a serious failure. like a shorted or open coil. so that is not a good test.

my coil had arcing going on . in the dark engine on I could see flashes on the coil body . then when I removed it I could see carbon tracking which in my case about 1/8 inch in size. replacing the coil increased the voltage which then cause the engine under load to put out max HP... at idle it was not noticeable..

these failures of coils will not always be the same so my failure my not be the same as yours so the engines issues my very well be different..

I do have a device that creates high voltage to test for insulation break down . this would be the testing to do you place the high voltage on the coils and see if it indicates any current leakage to the frame of the coil mounting.

I changed the coil and the ICM .
I took a trip down south jan/feb. used my new truck. when I came back after 2 months the Impala started up on the first crank just like I used it the day before ..
Thank you, gentlemen. I agree that my test was not conclusive. Googled of course, but could not get much info about testing the coil with commonly available tools.

There’s nothing as permanent as a temporary solution.

1995 Cadillac Fleetwood Brougham 118,XXX miles.
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