Real time help: stranded in grand junction, CO

[PabloCruise]

Yep, suppose to be a stronger controled spark is my guess.

On your readings, you get 1.1 ohms on your primary and 13.48 k ohms on your secondary. That don't sound right if your the manual is correct to you fj40. It says primary should be: 2.6 - 4 ohms and the primary should be 6 - 9 K ohms. Almost looks like you have a good coil but the wrong application.....but I need more info before I can say that. Can you still see the part on the coil. I try getting the oem ones.

On a different note, I have seen coils stop working entirely, easy to troubleshoot. I have seen one where it only worked when the engine was cold and fail 20 minutes after it warned up. Have also seen bad wires cause it to back fire. Other times make it look like the rpms go down causing the engine to bog down and not go faster than 45 mph and all of sudden correct it self. And that was one sparkplug wire doing that.

Thank you - see the test specs for Resistor Type - the primary and secondary windings test like this type:

I was able to figure out what coil I am running:

 

[PabloCruise]

It looks like I never posted an update to my issues in here!

TL;DR - one of the carb studs was loose:

Ignition Coil Questions - 1978 Fed Spec 40

I would start with swapping the coil and see what happens. Next would be either swap the igniter with a known good unit. Or pick up a GM HEI igniter and wire that up and see how it runs. I'm pretty sure you will find what is failing. Thanks John. I did order up a replacement coil, more on that...

forum.ih8mud.com

 

[Last Flight Out]

It looks like I never posted an update to my issues in here!

TL;DR - one of the carb studs was loose:

Ignition Coil Questions - 1978 Fed Spec 40

I would start with swapping the coil and see what happens. Next would be either swap the igniter with a known good unit. Or pick up a GM HEI igniter and wire that up and see how it runs. I'm pretty sure you will find what is failing. Thanks John. I did order up a replacement coil, more on that...

forum.ih8mud.com

View attachment 3715997

What the deuce!?

 

[PabloCruise]

What the deuce!?

A lot of brain damage over that...