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Old 06-07-2010, 11:23 AM
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AbandonedBronco AbandonedBronco is offline
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Ignition only firing after letting off the key

Hey all,
My brother's having some issues with the 1986 carb'd 351 in his Bronco. Sometimes it just won't fire up, and will crank and crank without any results until the moment he'd stop trying to start it.

He said he pulled the wire off of the coil and watched the end while someone else tried to start it and there wasn't any spark until they let off the key, and then it would spark once.

Any ideas what may be causing this? Ignition module? Coil? Starter solenoid? Etc.
Thanks.
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1981 Ford Bronco. 300I6 Offenhauser DP Intake Holley 600 4bbl, 31" BFG A/T, NP435, 3.00 rear 9" EFI Manifolds. 2.5" high flow cat/muffler.
1984 Ford Bronco. 300I6 Offenhauser C Intake Holley 600 4bbl, 31" BFG A/T, NP435, 3.55 rear 8.8" EFI Manifolds. 2.5" high flow cat/muffler.
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Old 06-07-2010, 12:11 PM
Torky2 Torky2 is offline
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Yup, IF you have the DuraSpark II ignition system!

When you turn OFF the DuraSpark II ignition system, it fires one time. It really helps in troubleshooting.

Disconnect the plug to the distributor, and ohm out the pickup coil that is inside via the wires.

I went out to the garage and dug up an old intermittent one that caused me problems on a Ford wagon years ago. It has Purple, Orange, and Black wires on it. The Black is a ground, the pickup's coil is the Purple and Orange wires, at least on this one.

If it measures open, that's the problem. Pretty easy to fix with the distributor in place. Remove roll pin holding in the reluctor (the toothed wheel) carefully, pull off the reluctor, then remove snap ring that holds the pickup coil/magnet assembly down. at least that is what I remember from about 15 years ago!
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Old 06-07-2010, 12:28 PM
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Thanks for the response.

Are you talking about the distributor or the ignition control module in your description above?

So, if it measures open, what does that mean?

Open up the distributor, remove reluctor, etc (BTDT), and then what?

I wasn't sure if I missed something.
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1981 Ford Bronco. 300I6 Offenhauser DP Intake Holley 600 4bbl, 31" BFG A/T, NP435, 3.00 rear 9" EFI Manifolds. 2.5" high flow cat/muffler.
1984 Ford Bronco. 300I6 Offenhauser C Intake Holley 600 4bbl, 31" BFG A/T, NP435, 3.55 rear 8.8" EFI Manifolds. 2.5" high flow cat/muffler.
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Old 06-07-2010, 02:17 PM
Torky2 Torky2 is offline
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The pickup coil is inside the distributor. It's wires extend out of the distributor to a plug. Unplug it, and check the resistance into the distributor side. You are trying to determine whether the pickup coil still has continuity (good), or is open (deceased).

If it is open, I gave steps how to remove the old one. And as they say, reassembly is the reverse of disassembly.

Here is a link to a pic of the pickup coil. It is an assembly consisting of a pickup coil and a magnet. It replaces as one part.

More Information for STANDARD MOTOR PRODUCTS LX204

From a 1982 Ford manual, the pickup coil should have resistance in the range of 400 - 1300 ohms if it is good. I can't measure my old one, 'cuz it's open. Anywhere in or near that range is good.
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Last edited by Torky2; 06-07-2010 at 02:30 PM. Reason: Additional info
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Old 06-07-2010, 02:33 PM
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Awesome. Thanks Torky2, I'll get with him and we'll look into it.

I figured that's what you meant after reading a few other posts that people were saying about the Duraspark but wanted to be sure.
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1981 Ford Bronco. 300I6 Offenhauser DP Intake Holley 600 4bbl, 31" BFG A/T, NP435, 3.00 rear 9" EFI Manifolds. 2.5" high flow cat/muffler.
1984 Ford Bronco. 300I6 Offenhauser C Intake Holley 600 4bbl, 31" BFG A/T, NP435, 3.55 rear 8.8" EFI Manifolds. 2.5" high flow cat/muffler.
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Old 06-07-2010, 03:04 PM
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Well, took the ICM down, it failed 4/5 tests. It was only a couple years old.
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1981 Ford Bronco. 300I6 Offenhauser DP Intake Holley 600 4bbl, 31" BFG A/T, NP435, 3.00 rear 9" EFI Manifolds. 2.5" high flow cat/muffler.
1984 Ford Bronco. 300I6 Offenhauser C Intake Holley 600 4bbl, 31" BFG A/T, NP435, 3.55 rear 8.8" EFI Manifolds. 2.5" high flow cat/muffler.
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Old 06-07-2010, 03:04 PM
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1978, 1979, 351, 58l, 78, bronco, coil, failed, fires, firing, ford, ignition, key, pickup, resistance, truck, turned

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