Testing coils out of car

[BamSHO]

Is there any easy way to test the coils to see if there any good out of the car. I have about 16 here and need to go thru them. Was figuring someone here might of found away to test them.


Brian Michael
98 silver Gen3

 

[sperold]

Pm gmorrel.
I remember a post awhile back where he explained the workings of a coil very completely.

 

[SHO U UP]

You can use a multimeter to test 'em if they're out. I tested mine a few weeks ago. Gotta connect to the bottom of the coil in the boot and touch the prongs where the car's connector goes. I can't remember for the life of me what the volts should be though right now.

 

[BamSHO]

ok thanks, I got 8 out of Gen3 in a boneyard. Just want to check, nice to have spares around.


Brian Michael
98 silver Gen3

 

[Liquid_force]

You'd be testing for resistance wouldn't you? Ohms, not volts.

there's some info here: http://www.v8sho.com/SHO/CoilOnPlugTest.htm

 

[SHO U UP]

You'd be testing for resistance wouldn't you? Ohms, not volts.

there's some info here: http://www.v8sho.com/SHO/CoilOnPlugTest.htm

Yup, you're right, I goofed. That's for the correction.

 

[Liquid_force]

The question prompted me to take some measurements on my coils since they are all out of the car.
The car had a miss when I test drove it, and I was informed 2nd hand that a mechanic found a DTC indicating a miss on cyl #4.
I marked that coil when I pulled it.

I took 3 resistance measurements on each coil. The first two were with one probe where the spark plug connects and the other probe on each of the wire connector contacts. On 6 of the coils both of these 12 measurements were 5.39-5.42k ohms. On the other two (one being the one I had marked) I got an "open loop" indication from my meter.

The other measurement was with one probe on each of the contacts. All 8 of these measurements were 0.9 to 1.0 ohm.

I'm going to assume the 2 that gave me opens between the plug connection and wire connection are bad. Regardless, I was going to buy four new ones for the rear bank anyway, but now know what two I won't use on front.