I have a 1982 Ford F250 with a 5.8 liter engine that has an EEC Relay. I think the Relay is preventing the truck from starting. Does anyone have diagrams or know how to bypass or jump the relay so I can avoid getting another one.

 

 

Do you know how to bypass or jump the Relay?

 

Is the relay pictured in Mil1ion's diagram?

If it's the starter relay, then no, you will have to buy a new one.


If it's a computer relay then the answer is also no, you will have to buy a new one.


If you have the dreaded EECIII with the Duraspark III ignition system like is pictured in mil1ion's diagram, I would recommend, (if your state would alow it) to go over to a duraspark II system.

 

There is a relay right by the starter relay that is not in the diagram. I think that is for the dreaded EECIII with the Duraspark III ignition system that you mentioned. How can I jump that Relay?

 

It's a rectangular device made of plastic isn't it. It looks square from the top and the wires plug in from the bottom.

The top part is also color coded with a color. Either Black, blue, brown, green, yellow as examples etc.


Unfortunately you can't bypass that relay, you have to get another one. Any attempt to bypass can result in computer damage.

 

Can this relay prvent the car from starting and can I get one from the junk yard? If so, what other Fords have this relay?

 

Oh yes, it can prevent it from starting. It makes the whole computer system non-operational if it's not working.

As, for the junk yard, match the color and part numbers. Look in vans, trucks, cars etc... they were used on lot's of different vehicles.

Check your fuses, make sure none of them are blown check the wiring, have the Duraspark III module tested. The C.P. sensor also is a known source for no start engine failure.

Also if your EEC-III is self diagnostic, try and pull the codes from the computer. If the relay is bad, you wont be able to pull any codes. (either that or your computer is toasted or wiring problem to computer, blown fuse etc...)

 

I noticed that the distributor was changed to a Duraspark II type distributor. But the Ignition module and evrything else are Duraspark III. I am not getting spark out of the coil even thogh I changed the Module, coil, ignition switch, and rebuilt the distributor. Still no spark. Thats why I considered the EEC relay. What else can it be?

 

Duraspark III and II are quite simular in looks.

If you have a Duraspark II Distributor, I would swap the ignition module to a duraspark II. The Duraspark III requires a signal from the C.P. sensor via the EEC III, and if that sensor is bad, no spark. Switching to duraspark II system eliminates that sensor. Then you would only have to switch your carb to a non feedback type, then you could do away with the EEC all together.

So with all the parts you replaced, it could either be the relay, as mentioned earlier, the C.P. sensor, the EEC computer, or the wiring. Or one of the new parts is defective, or out of adjustment.


I feel your pain here, way too much stuff can go wrong with your setup. A EEC-IV with TFI-IV is preferable to the EEC-III Duraspark III, setup, and the EEC-IV / TFI-IV is a pain as well, just ask people here. I highly recommend a duraspark II conversion asap, if your state alows it.

If you live in california, I'd switch to the EEC-IV / TFI-IV system, because it's more reliable than what you have, and California alows so called "upgrades" like that. This would be a huge job though, not for the weak hearted.

Edit:

Make sure that you actually have a DSII distributor. A DSIII distributor does not have a vacuum advance. The DSIII distributor also has to be aligned properly.

 

Would I also have to change the wire harness? The ignition module I have now has the yellow 3 plug hook up, but the Duraspark II has a Blue 2 hook up. Oh, by the way, my distributor does have a vaccum advance. Someone must have converted it sometime before I owned it. It has some of the old and new system in it. But the wire harness that goes to the Ignition module is still the original.

 

Yes the wiring harness needs to be changed to a DSII system if you plan on converting it to a DSII system, because the wires that go to the ignition module goes directly to the EECIII computer on the DSIII.

The DSIII distributor is basicly a gear driven shaft with a rotor, cap adapter and cap. There is no guts to it at all, no wires going to it etc. The C.P. sensor takes the place of the DSIIs Magnetic pickup.


A DSII distributor has wires going into it, that lead to the DSII ignition module a magnetic pickup, and vacuum advance. A DSII distributor can be exchanged like you explained, but the wires wouldn't have anywhere to plug in or the vacuum advance would be useless and or hinderence cause of the EEC control etc...

Sounds like you have a mongrel.

 

Should I just rewire it, disconnecting the computer, and put a DII Ignition module?

 

If your state will alow that, that is what I would do. Living in california they would not let me do it however. Depends where you live in the world.

You would also have to switch carbs from a feedback carb to a non-feedback carb for it to run right without the EEC.

 

The Carb has already been changed. Since I am going th change the system. That means the Ignition module as well. I have a 3 connecter with yellow posts. What color should work properly? They come in blue, brown, red, and green for the 2 connecter Duraspark system.