I have a '64 F250 with a 70something FE 360, 4x4, np4350. I'm not getting spark in 2 plug wires at idle. Oddly, it sounds fine at idle. When I give it throttle I get spark in the 2 wires but it doesn't seem smooth and continuous, it seems erratic and weak which I suppose is why under load it's sputtering and popping. I have a new dist. Cap and new plugs and wires and new coil, truck ran great for a couple months now this. I had put a new coil in a few months prior to this one and it went bad. Both were napa coils. I'm planning on modifying the ignition system with MSD coil and distributer. Any input from you guys would be helpful; I don't want to replace all of this and have a reoccurring issue.

Also if any of you are familiar with ford's XPI "extra power ignition" box I'd love some input. If I use a blaster II coil do I still need the box? Could that be causing any of my issues?
Thanks for all your insight in advance!

 

i thought i'd at least heard of all the ignition systems...
what is XPI?

 

Where did you come up with this jazz? There is no such thing.

 

I'll send you a picture when I get home, Bill.

 

Its a box bolted on the firewall wired to the coil.

 

Did you replace the rotor, points and condenser when you replaced the distributor cap, wires and coil? Can you tell which two plugs are not getting spark? Always the same two? You can check continuity with a meter from each outer post on the underneath side of the distributor cap to the center spark plug tip and see if it changes when you wiggle the wires.

 

Still have no idea what "XPI" refers to. It's not FoMoCo related, that's for dang sure.

DuraSpark electronic ignition intro'd in 1974. On 1974/79 F100/350's, the module was originally located on the left fender inner apron, just in front of the firewall.

DuraSpark dizzy has a stator aka magnetic pickup coil, takes the place of the points and condenser.

1974/79, there are five different modules and respective wiring harnesses, none of which interchange.

 

let the guessing games begin!

i'm betting someone tried to be funny by putting a sticker on a Duraspark box.

 

Sorry to be the bottleneck in this conversation. Date went... Well last night, so I didn't get a chance to work on the truck. I have a short day at work today so my afternoon will be in the garage.

 

HHAHAHAHAHAAA - congratulations, man.
we'll be here whenever you, uh...are free.

 

subscribing

 

http://i1272.photobucket.com/albums/...psnsduu5kp.jpg

 

My mistake I thought it was a Ford product but it's from Hunt Manufacturing. In either case my question of if it could be a potential problem and if it would be necessary should I upgrade the ignition.

Although if it's not my issue here I may not upgrade it.

 

whoa.
was not expecting that...

ok- i see a power wire (red) coming in, and then i'm guessing the black/white go to the distributor. what's inside the distributor? points? something else?

 

i'd ****** that thing out so fast it'd make your head spin.