No coil spark

OLDFORDDOG

MEMBER
1989 FORD F-250
5.8L
V8
4WD
MANUAL
90,000 MILES

Have no spark coming out of a brand new coil. What can cause this to happen?

Saturday, September 9th, 2017 AT 3:42 PM

4 Replies

CJ MEDEVAC

MECHANIC
11,005 POSTS

Using a voltmeter, what is the voltage to the positive side of the coil with the key in the "on" position?

Is there any kind of history that may have influenced this problem?

The Medic

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Saturday, September 9th, 2017 AT 5:20 PM

OLDFORDDOG

MEMBER
2 POSTS

I did test the positive side with my meter and had voltage there. I read that both wires to coil should have power when key is on, so I am unclear about that. Should the negative side have voltage or no voltage when key is on?
Thank you!

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Monday, September 11th, 2017 AT 10:39 AM

CJ MEDEVAC

MECHANIC
11,005 POSTS

Why did we install the new coil?

The Medic

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Monday, September 11th, 2017 AT 3:16 PM

CJ MEDEVAC

MECHANIC
11,005 POSTS

Without digging for anymore information right now.

This would be my first guess to a sudden engine death and then discovering spark is not present. Like I said, best guess without further testing. See link below:

https://shop.advanceautoparts.com/p/msd-ignition-module-ford-tfi-for-8452-8453-8456-83648/10211626-P?searchTerm=ign+module

To make things a bunch easier,

One of these puppies does the trick! See link below:

https://shop.advanceautoparts.com/p/autocraft-ignition-module-tool-ac666/10051084-P?searchTerm=ign+module

Insure you use some of that heat sync grease behind it, so that heat will dissipate through the distributor body.

Keep us posted.

The Medic

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Tuesday, September 12th, 2017 AT 3:56 PM