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.
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. Supermotors Pics
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!
'94 Bronco XLT 5.8L E4OD Tow Pkg., Quad front shocks.
'97 F-150 Lariat SuperCab LongBed 4.6L 4R70W Tow Pkg.
2010 Escape XLT 2.5L, 6-speed Auto, FWD.
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.
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