Ingition trouple possibly
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Ingition trouple possibly
Ok, I have a 68 ford f100 custom, had it bought 2 years now, it has a 302 small block 3 on tree all manual, but originally had an inline 6 from vin, It ran and crunk up on a dime, and would shred the tires when i punched it first year i drove it. But the ingition module was melting (going out) so i bought a 78 ingition module to go in it, and it would not crank so i bought a 78 distributor single vac steel gear to match the box, (I had cut the wires off the module plug cause wires where in wrong place for the old distributor i had,) and it would crank and idle perfect, but when i punched the gas it would act as if it was missfireing at advanced high rpm. so i unpluged the two black wires from distributor and reversed them and truck would run good no missfires or anything but the next day i tride to crank the truck it was forcefully hard to crank ( engine was cranking slow) any body knows anything its getting fustrating working on so please help.
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ah...whew.
let me see if i'm following you.
you started out with a '68 that someone had done a Duraspark conversion on (there would have been no ignition box on a '68).
you bought a '78 Duraspark box to replace the unknown box that was melting.
that didn't work, so you bought a '78 distributor to match, but you'd already chopped up the wires from the new ignition box.
i'd repair the wires, or get another ignition box.
gotta say- i'm all kinds of curious as to what distributor was in there before.
let me see if i'm following you.
you started out with a '68 that someone had done a Duraspark conversion on (there would have been no ignition box on a '68).
you bought a '78 Duraspark box to replace the unknown box that was melting.
that didn't work, so you bought a '78 distributor to match, but you'd already chopped up the wires from the new ignition box.
i'd repair the wires, or get another ignition box.
gotta say- i'm all kinds of curious as to what distributor was in there before.
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From: Fremont
pumphrey can you post up a pic of the components you have installed?
when you say 'ignition module' which module is that exactly? sometimes people will say ignition module when they really mean some other component.
Just trying to be helpful with determining the issue
when you say 'ignition module' which module is that exactly? sometimes people will say ignition module when they really mean some other component.
Just trying to be helpful with determining the issue
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By the ignition box I mean the brain box, and ya someone converted the ignition from a points to an electronic. I couldnt find the old distributor from before but the castings pulled up late 60,s early 70,s mustang. Right now the engine will crank right up and run no problem but after awaile, when I spin it over to crank again it cranks hard almost like a bad ground or out of time.
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That sounds like your initial timing is set too high.
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From: Fremont
Check battery condition and that all cable connections are properly secured, and that the dizzy is putting out enough power..
From your posting... it looks like finding a better dizzy will clear things up.
From your posting... it looks like finding a better dizzy will clear things up.
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But the thing is if I set the timing any lower in it wont advance when I step on the gas just sputter, right now where I have it I can turn the key over and it will crank almost right when I tap the key, just later on if I try to crank it it cranks slowly.
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If you meaning the cap, I have changed the cap and rotor button its all new.
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What is the timing set at currently?
Cargo Master
Joined: Jul 2003
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From: Four Oaks, NC
If you have a duraspark ignition, then I believe if you wire up the white wire (I am not 100% sure, I can't find the wiring diagram I saved!) to your start terminal on the solenoid, then when you hit the key to start it, a signal goes down the white wire which tells the distributor to retard timing. As soon as it starts and you release the key into normal on position the ignition timing goes back to normal; whatever you have it set for. This lets you have timing advanced but without the problem of hard starting.
Ford Parts Specialist
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From: Simi Valley, CA
DuraSpark electronic ignition introduced in 1974, but not all F100/350's came with it until 1976.
The module used in 1974 is 1974 only / The module used in 1975 is 1975 only.
THREE different modules used 1976/79. Modules are identified by a colored plastic square above where the wires feed out.
One of these modules (red plastic square) was only used in some 1976/79's sold new in CA. It's been a POS since day one: STAY AWAY!
Another was only installed in 1978/79 high altitude vehicles (1978 brown plastic square module replaced by 1979 yellow plastic square module).
The most common 1976/79 module has a blue plastic square, was used in myriad FoMoCo vehicles thru the 1990's.
1977: FoMoCo changed the dizzy cap. Has male ends, clips onto a plastic adapter.
The module used in 1974 is 1974 only / The module used in 1975 is 1975 only.
THREE different modules used 1976/79. Modules are identified by a colored plastic square above where the wires feed out.
One of these modules (red plastic square) was only used in some 1976/79's sold new in CA. It's been a POS since day one: STAY AWAY!
Another was only installed in 1978/79 high altitude vehicles (1978 brown plastic square module replaced by 1979 yellow plastic square module).
The most common 1976/79 module has a blue plastic square, was used in myriad FoMoCo vehicles thru the 1990's.
1977: FoMoCo changed the dizzy cap. Has male ends, clips onto a plastic adapter.
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