Duraspark II module going bad.
Senior User
Joined: Sep 2013
Posts: 373
Likes: 0
From: Marlborough, CT
FX101 is a Chrysler module. FWIW all the modules are pretty tough and last well over 100k if mounted correctly and properly grounded. When someone starts mounting these with zip ties and barrel crimp connectors is when the problems start. ~Bill
Senior User
Joined: Dec 2013
Posts: 348
Likes: 4
From: Bakersfield,CA
Have 1982 300-6 Duraspark system.
This ignition sytem is very senstive to proper grounding.
Bench tested the entire system compoents just using the black ground wire from distributor to ignition module, NO spark.
If grounding from engine to fender where module is mounted, could have excessive resistance greater than .1 ohm and system will not operate.
Placed jumper between distributor case and ignition module case, GOT spark.
With Duraspark system intalled on engine, run a separate ground wire from distributor case to ignition module case mounting screw.
This ignition sytem is very senstive to proper grounding.
Bench tested the entire system compoents just using the black ground wire from distributor to ignition module, NO spark.
If grounding from engine to fender where module is mounted, could have excessive resistance greater than .1 ohm and system will not operate.
Placed jumper between distributor case and ignition module case, GOT spark.
With Duraspark system intalled on engine, run a separate ground wire from distributor case to ignition module case mounting screw.
Thread Starter
|
Laughing Gas
Joined: Dec 2010
Posts: 924
Likes: 1
When you say distributor case you mean from the distributor ground wire to the ignition module case
Thread Starter
|
Laughing Gas
Joined: Dec 2010
Posts: 924
Likes: 1
I'm happy to inform you guys that Big Red is A-OK I replaced the plugs (non EFI), autolite spark plug wires, new ignition module, cap, and rotor. I went to the junkyard today and scored a Motorcraft canister style coil and ignition module the original duraspark 2. I removed my TFI coil and she took a while to start but when she did it was purring like a kitten.
Just drove the old girl with the canister coil and man do the RPM's wine up way quicker then it did with the TFI coil. I was amazed on how it performed
Just drove the old girl with the canister coil and man do the RPM's wine up way quicker then it did with the TFI coil. I was amazed on how it performed
Thread Starter
|
Laughing Gas
Joined: Dec 2010
Posts: 924
Likes: 1
I also noticed today when I was turning on my truck that it won't start until you let go of the key it'll crank for a while and it won't start by it's self until you let go of the key. Is that normal, could it be because of the coil change?
Cargo Master
Joined: Mar 2008
Posts: 2,569
Likes: 207
From: Washington
Also check coil positive voltage KEY ON not running and again at idle.
Jim
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Thread Starter
|
Laughing Gas
Joined: Dec 2010
Posts: 924
Likes: 1
I also had another canister coil to try but still the same effect.
Cargo Master
Joined: Mar 2008
Posts: 2,569
Likes: 207
From: Washington
With the small "S" wire on the starter solenoid pulled (so the starter can engage) ... in the Start KEY position ... voltage should be 12VDC or same as battery voltage
Thread Starter
|
Laughing Gas
Joined: Dec 2010
Posts: 924
Likes: 1
So should I crank it with the S wire unplugged to check if I have the voltage there or should also be "key on engine off" to check for voltage
Thread Starter
|
Laughing Gas
Joined: Dec 2010
Posts: 924
Likes: 1
I have 7.2 volts at the coil. I unplugged the signal wire on the starter relay with the key in the RUN position I only had 0.01 volts electrical is my strongest point but that doesn't seem right I must've been doing something wrong
Cargo Master
Joined: Mar 2008
Posts: 2,569
Likes: 207
From: Washington
The wire on the start relay only see power with the key in start, but also disables the starter, so the point was to check both coil positive voltages in start and key ON positions
Thread Starter
|
Laughing Gas
Joined: Dec 2010
Posts: 924
Likes: 1
Ahhhhh I see what you mean now okay tomorrow I'll check it out. It's dark over here now but I will keep you posted thank you for your help.