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Unread 01-21-2012, 08:59 AM   #1
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Default No spark, 84 f250 with 460

Hey guys, I'm not getting any spark to the spark plugs on my Ford. It has the Duraspark II ignition system.

Some background info, the engine ground came apart and fried my ignition control module. (It would just crank even when it was on the "run" position). I replaced that and now it doesn't get any spark. I used a test light and the coil is getting power when it's in the run position.

I don't really know where to begin diagnosing and looking for issues.

Any help getting this piece of junk running again would be appreciated
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Unread 01-21-2012, 03:35 PM   #2
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I can't find my diagnostic info on that ignition, but check the other side of the coil for a pulse on a grounded test light while you crank. That is the signal you need to make the spark. No signal means problems down stream, like the module or distributor. So far I've always found the module to be the problem, providing you have power to it. If you are getting the pulse then the coil itself is the problem.
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Unread 01-26-2012, 05:05 PM   #3
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No pulse on the negative side. Which module are you referring to? Thanks.
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Unread 01-26-2012, 07:04 PM   #4
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Dura Spark ignition module

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Unread 01-26-2012, 07:14 PM   #5
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That's what I thought but just wanted to make sure

Already replaced that last week, so the new one should be good. Must be boiled down to something in the distributor then. (I got a new coil today and that didn't fix it, either).

Thanks again, Car guy!
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Unread 01-26-2012, 07:44 PM   #6
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The pulse comes from the distributor, goes to the spark module, then the module sends signal to the coil that makes the spark.

So if you are not getting a pulse at the coil, the problem is upstream.

Check for power at the module. I don't have diagnostic info on the distributor, sorry.
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Unread 01-26-2012, 10:55 PM   #7
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sorry no help either old Fords I stay away from. to many damn fusible links that can burn out also, and Fords older wiring diagrams seem to have been purposely built to confuse so no one knew they didn't know crap about wiring.
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Unread 01-26-2012, 11:30 PM   #8
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Here is a diagnostic PDF chart fer ya, good luck

DURA-spark.pdf
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Unread 01-27-2012, 01:12 AM   #9
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It's probably the pickup in the distributor. If not that, perhaps it has a module on the side of the distributor like mine? I had that go out and the engine only had fire for about a minute, then it warmed up enough to open a contact in that module and it lost fire.
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Unread 01-29-2012, 08:51 PM   #10
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Everything's been pointing to that, but my distributor doesn't have a module on the side of it, it's just got the pickup module inside it, and has a connector that brings wires back to the ICM.

I'm going to be converting it to HEI, and eliminating that ICM and all the other DuraSpark stuff.

Found a cheap HEI dist. on eBay and I'm going to give that a shot.
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