So we have this old F250.....HELP!
 

Hello All,

So our 1991, F250 doesnt start......simple diagnosis is no spark. So I did the easy stuff, replaced the coil, battery was old so put a new one in, new rotor and cap, still nothing, then remembering I had ECM problems years ago I swapped out the ECM....nothing.

Any ideals?

Thanks Pelicans!!
mg

Did you check the ignition control module on the side of the distributor?

Actually I did. I have a Haynes manual and it gave me Ohm readings and all looked to be good!
????????
Thanks
mg

Would the igntion control module result in no spark at the coil? Thats where I am checking for spark and I have nothing!
Thanks again!

Yes. I used to replace soo many of these back in the day, that I did not even bother to diagnose them. I would just bolt a new one on whenever one would come in with no spark. I always kept one on the shelf

Thanks fast fred!!
It is difficult to see what tool is needed to remove the 2 screws holding the module on, what size socket? or ???
I think I will try to replace it!!
Thanks again!!!
mg

On my vehicle I've got a dark green yellow wire going from the coil to the Control Module and then a white light blue wire going to the EEC power relay. I would check to see if you're getting any current there.

Thanks Ed I will check this too!

Oh yeah, I would agree with Fast Freddie. Just replace the thing. They're not expensive.

It is s special tool to get at the two bolts holding it on. I cannot remember the size of the bolt head, but it is a super thin walled socket. The parts stores used to carry them. In a pinch, you can grind down a 1/4 inch socket. to fit in there. I'll look to see if I can find mine, funny, I have not replaced one of these in years .

Thanks Fast Fred!

I did find it down in the deep recesses of the drawer of forgotten tools. If you cannot source one locally, let me know, I'll send it to ya, as long as you promise to send it back.

What size is it? So basically it is a thin wall, very long socket? I am hoping I can buy one locally!!! May have to take you up on your offer, if I cant.....and I promise to send it back!!!
Thanks again!!
mg

Thanks Fast Fred!!!
It was the ignition control module!
Runs great now!
Mg