Go Back   Ford Truck Enthusiasts Forums > Bronco > 1978 - 1996 Big Bronco
Sign in using an external account
Register Forgot Password?


1978 - 1996 Big Bronco SPONSORED BY:

Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 06-07-2010, 12:23 PM
AbandonedBronco's Avatar
AbandonedBronco AbandonedBronco is offline
Moderator
 
Join Date: Dec 2007
Location: Boise, Idaho
Posts: 4,939
AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.
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.
__________________
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
Reply With Quote
  #2  
Old 06-07-2010, 01:11 PM
Torky2 Torky2 is offline
Posting Guru
 
Join Date: Sep 2003
Posts: 1,158
Torky2 has a good reputation on FTE.Torky2 has a good reputation on FTE.
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.
Reply With Quote
  #3  
Old 06-07-2010, 01:28 PM
AbandonedBronco's Avatar
AbandonedBronco AbandonedBronco is offline
Moderator
 
Join Date: Dec 2007
Location: Boise, Idaho
Posts: 4,939
AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.
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.
__________________
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
Reply With Quote
  #4  
Old 06-07-2010, 03:17 PM
Torky2 Torky2 is offline
Posting Guru
 
Join Date: Sep 2003
Posts: 1,158
Torky2 has a good reputation on FTE.Torky2 has a good reputation on FTE.
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.
__________________
'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.

Last edited by Torky2; 06-07-2010 at 03:30 PM. Reason: Additional info
Reply With Quote
  #5  
Old 06-07-2010, 03:33 PM
AbandonedBronco's Avatar
AbandonedBronco AbandonedBronco is offline
Moderator
 
Join Date: Dec 2007
Location: Boise, Idaho
Posts: 4,939
AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.
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.
__________________
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
Reply With Quote
  #6  
Old 06-07-2010, 04:04 PM
AbandonedBronco's Avatar
AbandonedBronco AbandonedBronco is offline
Moderator
 
Join Date: Dec 2007
Location: Boise, Idaho
Posts: 4,939
AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.AbandonedBronco has a great reputation on FTE.
Well, took the ICM down, it failed 4/5 tests. It was only a couple years old.
__________________
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
Reply With Quote
Old 06-07-2010, 04:04 PM
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
79 F250 400M won't start Ndurbin10 1973 - 1979 F-100 & Larger F-Series Trucks 10 04-01-2014 08:17 PM
Ignition woes 77beater150 1973 - 1979 F-100 & Larger F-Series Trucks 17 02-23-2014 10:36 AM
No fire until key is let off after cranking cr506 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks 27 03-06-2008 10:00 PM
95 F150 coil firing when engine is off Grandpa's1983 1987 - 1996 F150 & Larger F-Series Trucks 1 02-26-2006 05:02 PM
Bronco with no spark oldgost Bronco II 9 04-13-2004 02:40 PM


Go Back   Ford Truck Enthusiasts Forums > Bronco > 1978 - 1996 Big Bronco

Tags
1978, 1979, 351, 58l, 78, bronco, coil, failed, fires, firing, ford, ignition, key, pickup, resistance, truck, turned

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


Participate In The Forums

Create new posts and participate in discussions. It's free!

Sign Up »





All times are GMT -5. The time now is 01:02 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup