ignition Gremlin?
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Senior User
Joined: Mar 2004
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From: Georgetown Tx
ignition Gremlin?
Just in time for Halloween? My 86' 460 has developed a spark problem that I can sus out. It first died out on the road, like it had a bad power valve (Yep, a holley) changed valves and found I was barking up the wrong tree.
My ignition doesnt spark up until I let go of the Key. Like it sparks only for a second when I stop cranking it. I changed coils and it has the same effect. I cranked it and watched a extra spark plug intsalled on the #1 wire, and the only time it will spark, is again, when I disengage the starter solenoid... It does that almost every time. Anyone had this problem before? I am using the original Duraspark elecrtronics module plus a recently new,recurved durapark dizzy. I checked and moved timing position too ....No change. Thanks ya'll, barca.
My ignition doesnt spark up until I let go of the Key. Like it sparks only for a second when I stop cranking it. I changed coils and it has the same effect. I cranked it and watched a extra spark plug intsalled on the #1 wire, and the only time it will spark, is again, when I disengage the starter solenoid... It does that almost every time. Anyone had this problem before? I am using the original Duraspark elecrtronics module plus a recently new,recurved durapark dizzy. I checked and moved timing position too ....No change. Thanks ya'll, barca.
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
it's in the bypass/start circuit, either within the ignition box or in the wiring from the ignition switch. an easy check would be take a box that you know works and put it in if it starts you know thats it, if not then your gonna have to trace out the wiring to find the bad wire. or possibly the switch.
Senior User
Joined: Sep 2005
Posts: 359
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From: Saint Paul, MN
I recently had this problem with my '76 F250. (390) It would crank but not start until I let off the key. I have the Duraspark ignition. The same ignition in my '79 CJ 7 Jeep. Had a problem with that, too. I changed the module and coil twice in the Ford and it still didn't work. I got tired of messing with it. My solution was that I replaced everything with MSD components. 6A box, distributor and coil. Expensive, but I don't have any problems.
Cargo Master
Joined: Apr 2003
Posts: 3,476
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From: Frequently frozen MN
Could even be your ignition switch. Autozone has some wiring diagrams on line - I just checked - although they didn't show it as 86, I probably didn't have the heavy duty vehicle selected.
I'd disconnect the starter, and use a meter on the coil plus side -- It should show battery voltage with the key in start position -- and run position as well unless you have a ballast resistor (early models).
Next, I'd check the wires to the module -- says you have to CAREFULLY pierce them -- possibly with a straght pin -- then reseal when you're done ( clear nail polish and
elec tape should be good.
Anyway - red wire looks like battery voltage for run, and white wire should have battery voltage in start
Good luck,
ford2go
I'd disconnect the starter, and use a meter on the coil plus side -- It should show battery voltage with the key in start position -- and run position as well unless you have a ballast resistor (early models).
Next, I'd check the wires to the module -- says you have to CAREFULLY pierce them -- possibly with a straght pin -- then reseal when you're done ( clear nail polish and
elec tape should be good.
Anyway - red wire looks like battery voltage for run, and white wire should have battery voltage in start
Good luck,
ford2go
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Senior User
Joined: Mar 2004
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From: Georgetown Tx
The gremlin this time, was a bad dizzy pickup coil(stator). The bugger was reading infinite resistance until I pulled the dizzy and messed with it, then it went down to 650 ohms, then back to infinite for good. The reason it would spark when I turned off the ignition, was because that caused power to be cut off at the coil. When the Inductive field of the coil collapses (like when the stator switches the ignition module off) she throws a spark! Thanks to all for the help. Barca
More Turbo
Joined: Apr 2004
Posts: 736
Likes: 3
From: South East, Michigan
check out this thread, I had the same thing happen to me, -Ed
https://www.ford-trucks.com/forums/s...d.php?t=336497
https://www.ford-trucks.com/forums/s...d.php?t=336497
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