I just did the timing chain on a 1992 f150 xlt 5.0. I set the timing marks 10 degrees before top dead center. but was wondring how to set the advance? For the the Duraspark three system. If you have the schematics it would help.

thanks
Jhengl

 

I think you mean EEC-IV system.
Pull the SPOUT jumper out, set the timing at 10 degrees before top dead center.
Put SPOUT back in and you have it.

The Duraspark three system was mostly in trucks in California in the late 70's and early 80's.
If this is what you want you can post back and I will post the diagrams and setting for the Duraspark three system distributor.
Or
You can post over in that era forum.

 

if the timing chain is set for 10 btdc wouldn't the timing be set for 0 ?

 

The Haynes book I bought said to put the timing ten degrees before top dead center.but the book does not show what I see under the hood. If you look at the distributor the diagrams look nothing like what I see. there is no wire for the jumper and no vacuum lines or wires for the advance . the book is for 1980-1995 f150 and bronco. if you have better schematics and diagrams for a Duraspark three it would help me. mine only show duraspark 1 and 2 and only has three sentences for duraspark three. and if you can tell me how to set the advance .

 

What makes you think you have a duraspark three system?

Information on the duraspark three system:

If the computer (ECA) is under the seat it is most likely to be an EEC-III engine.

A few ways to confirm EEC-III:
1. It will be listed as such on the decal on the upper radiator support bracket.
2. The ignition module has a brown grommet.
3. The distributor rotor is disk shaped and has electrodes on both sides.
4. There is no vacuum or mechanical advance mechanism on the distributor.
5. There is a ring with 4 lobes behind the harmonic balancer.

The ECA control's the ignition timing and advance. It gets a signal from a Crankshaft Position Sensor mounted over the 4 lobed Pulse Ring. The CPS is a simple coil wound magnet. If it fails, the engine won't start. You can easily test it in place with an ohm meter. It should test 100-640 ohms. If it tests open circuit, it's failed and is easy to replace.

If someone unfamiliar with this type of ignition did something as simple as change the plug wires without knowing what they were doing, it could make the engine run rough or not at all.

The firing order is normal 351w:
CCW 1-3-7-2-6-5-4-8

The the order the wires are arranged on the cap is:
CCW 1-5-7-8-6-3-4-2

This is because the EEC-III distributor has electrodes on both sides of the rotor. So it fires alternately from both sides. So even though it's wired in a different order, if you go back and fourth from one side to the other, the firing order is the same.


EEC-III is often misunderstood because it is overshadowed by the greater number of the more simple Dura Spark II ignition. EEC-III (Dura Spark III) is more complex, but is capable of controlling the ignition advance up to a maximum of 50 degrees advance and control the engine more efficiently. It was used in both carbureted and fuel injected engines.

Oh, and yes, there is a relay on the ECA to protect it from reversed battery polarity.



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If he set the chain at 10 btdc I wouldn't think it would run.

 

it might run but could have piston to valve clearance problems, i wouldn't expect it to run long if he has any type of cam in it

 

the F150 starts but it will not go when you push on the gas.it has no power and will try to stall and run ruff. I tried to set the advance with the bolt under the distributor and got it to idle smooth but not under acceleration. the haynes book shows for duraspark three on the crank should be plus or minus 4 degrees on the crankshaft. the diagram on the hood shows it should be set 10 degrees before tdc. but is that right?

 

I will ask again, what makes you think you have a duraspark three?
Did you read my posts above?

 

My uncle came over and look at it and said the truck has the tfI Iv ignition system. the book just did not list the newer system.since it was for 1980 thrue 1996. he said I need to find the spout connector off the distributor. do you know where it is located on the truck? he said there are two versions and I would need the wire diagram to find out witch one I have.

 

i have a headache from reading this thread.

 

Your SPOUT jumper should be as in the photo below:




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