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no spark tried everything

#1 User is online   Red Green Jr 

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Posted 01 September 2008 - 01:12 PM

My bronco has been sitting for most of the summer with occasional use on the weekends only. One weekend, I tried to start it and it just wouldn't fire. After a while I tested the spark, and there was none. The distributor and coil were only a few months old and have been working great. Since the problem started I have replaced the voltage regulator, ignition module and the starter, I have tested all of the wiring to the coil and made sure that power is getting to the ignition module. When I was testing voltage to the ignition module, I got 12V when the key was turned to "on", but when I started cranking, the voltage dropped to 0.4V, which is obviously not enough to make a spark. The only possible candidates left are a bad ignition switch, or some other system is tied into the ignition and is sucking all the voltage. Other than that I have no idea what the problem is and am running out of patience.

thanks

This post has been edited by Red Green Jr: 01 September 2008 - 01:17 PM

1978 bronco ranger xlt
351M, edelbrock performer intake and 600cfm performer carb
newly rebuilt C6, np205
ford 9in rear diff with 31in mud terrains

http://broncograveya...ord_Bronco.html
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#2 User is offline   Seabronc 

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Posted 01 September 2008 - 07:37 PM

What ignition system do you have installed in it? Is it a Duraspark II? If that is the case then the pickup coil inside the distributor is bad. If it is a Duraspark II then I can upload you a diagram and troubleshooting procedure.

Good luck,

:)>-
Fred

Parts replacement is not trouble shooting, replacement follows trouble shooting

Broncos are MPVs not SUVs

Communication: I know you think you know what I said, but what you need to know is, I didn't say what I meant.

Some of my pictures at Supermotors http://www.supermotors.net/212

1983 Full Size Bronco with; Ford 8.8" 3.08:1 Rear; Dana 44 3.08:1 Front; WARN Premium locking hubs; 31x10.5's; NP208; Holley 4160 4bbl; MSD 6AL Ignition; MSD Blaster 2 coil;

1978 Saginaw Pump V-Belt Power Steering;
1984 F150 Dash;
1985 351W HO;
1985 Tilt steering wheel;
1993 Mercury Sable 3G 130 Amp Alternator;
1995 F150 doors;
1995 20 inches of rear portion of the tub;
1996 Bronco tail gate;
1996 Eddie Bower Over Head Console;
1996 Lincoln Mark VIII 4200 CFM Electric Fan;

Headlight harness upgrade; DRLs; Battery relocated to rear; Under hood fuse box vs fusible links; Upgraded wiring for rear window to 10 AWG;

Always under restoration
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#3 User is online   Red Green Jr 

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Posted 02 September 2008 - 12:35 PM

Its a duraspark, I have no idea if its a duraspark II or what. Is there a difference?
1978 bronco ranger xlt
351M, edelbrock performer intake and 600cfm performer carb
newly rebuilt C6, np205
ford 9in rear diff with 31in mud terrains

http://broncograveya...ord_Bronco.html
0

#4 User is offline   Seabronc 

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Posted 03 September 2008 - 03:16 AM

It probably is. Here are the diagrams and proceedure.

:)>-

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Fred

Parts replacement is not trouble shooting, replacement follows trouble shooting

Broncos are MPVs not SUVs

Communication: I know you think you know what I said, but what you need to know is, I didn't say what I meant.

Some of my pictures at Supermotors http://www.supermotors.net/212

1983 Full Size Bronco with; Ford 8.8" 3.08:1 Rear; Dana 44 3.08:1 Front; WARN Premium locking hubs; 31x10.5's; NP208; Holley 4160 4bbl; MSD 6AL Ignition; MSD Blaster 2 coil;

1978 Saginaw Pump V-Belt Power Steering;
1984 F150 Dash;
1985 351W HO;
1985 Tilt steering wheel;
1993 Mercury Sable 3G 130 Amp Alternator;
1995 F150 doors;
1995 20 inches of rear portion of the tub;
1996 Bronco tail gate;
1996 Eddie Bower Over Head Console;
1996 Lincoln Mark VIII 4200 CFM Electric Fan;

Headlight harness upgrade; DRLs; Battery relocated to rear; Under hood fuse box vs fusible links; Upgraded wiring for rear window to 10 AWG;

Always under restoration
0

#5 User is online   Red Green Jr 

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Posted 04 September 2008 - 09:10 AM

Thanks a lot!

This post has been edited by Red Green Jr: 07 September 2008 - 05:18 PM

1978 bronco ranger xlt
351M, edelbrock performer intake and 600cfm performer carb
newly rebuilt C6, np205
ford 9in rear diff with 31in mud terrains

http://broncograveya...ord_Bronco.html
0

#6 User is online   Red Green Jr 

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Posted 07 September 2008 - 05:36 PM

After more work, i still have not solved the problem. I had a few possible solutions, but none of them worked. I replaced the ignition switch too. Just this weekend, one of the wires popped out of the pigtail leading from the ignition module. I am getting a new pigtail and hoping that that was the problem. I had tested continuity in the wires before and it looked good, but old, corroded wires can be very flaky. Any more info would be greatly appreciated. thanks
1978 bronco ranger xlt
351M, edelbrock performer intake and 600cfm performer carb
newly rebuilt C6, np205
ford 9in rear diff with 31in mud terrains

http://broncograveya...ord_Bronco.html
0

#7 User is online   Red Green Jr 

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Posted 17 September 2008 - 01:05 PM

she lives!!! turns out it was the pigtail leading from the ignition module to the coil. i had checked it before and it passed but i guess it disconnected when i plugged it back in. so thats $83 of replacing working components and an $8 fix, aint life grand.
1978 bronco ranger xlt
351M, edelbrock performer intake and 600cfm performer carb
newly rebuilt C6, np205
ford 9in rear diff with 31in mud terrains

http://broncograveya...ord_Bronco.html
0

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