I have a 94 f 350 1 ton with a 7.5 l am having problems with loosing spark some time cold some times hot may run for days then no start at all i have replaced the ignition module and the coil no differance but happening more often now. help any ideas

 

One of the things that could be giving you trouble is the pick up coil in the distributor.
Here is how you can check it, when it won't start.
Using a test lite, at the time the engine won't start ,the lite connected to a good ground, one side of the ignition coil should should have constant voltage whenever the key is on and/ or cranking. The other side of the primary on the coil winding gets the signal from the pick up coil in the dist. and should show a blinking lite when cranking. If the lite doesn't pulsate the pick up coil is defective . Let us know if this helped to solve the problem.

 

Thank you i will try that tomorrow app your time

 

Of course, I ALWAYS agree with Hanky, as he's ALWAYS right. The close bowl pickup these used did this when they got tempermental. One other thing to check is that these pickup grounded through one of the 2 5.5mm bolts that hold it down. I've seen these get dirty (and corroded) and cause this. Just food for thought.
I hate it when Hanky's always right....

 

lol sorry greasemark but hanky was right had power on one side of the coil wire but dead on the other spark is back yaho thanks for all your time .

 

Sorry guys, but sometimes I get lucky too and this was one of them. We won't talk about the remainder of the times !

 

One thing to look out for is the good old fashioned tune up (especially wide plug gap and highly resistive wires) as these put undue stress on the coil, which will shorten its life.
Of course, there is just a really good chance that the coil was at the end of its life, also.

Damn you Hanky, I'll trip you up yet! (I hate to admit it, but you're a good tech. Nice to know there's at least one out there. I might even get you to work on my Escort).

 

Are you kidding? My wife won't even let me work on our wheelbarrow and it has only one wheel. How many wheels does your Escort have?

 

Wheelbarow? What's that

I bent the handles in to better fit my wifes reach, and told her it's now 'owner responsiblity' Put a 'never flat' tire on it to reduce down time too!

 

I'd be really surprized if your wife even TALKS to you after that! It could explain why you've devoted so much time to this forum, though....