I have a 1989 Ranger 2.9 with no spark. I have replace everything (Distributor, coil, ECU). The truck started twice but quit when I let go of the key. Now has no spark again. Is there an aftermarket setup I could replace the existing mess with?

 

ECU isn't part of the spark system as far as starting, just FYI, it "suggests" spark advance and retard info to the TFI module via the SPOUT connection but that's all it does for spark.

TFI system is self contained, good read here on that system: Ford EEC-IV/TFI-IV Electronic Engine Control Troubleshooting

TFI system has 4 components, distributor, TFI module, coil, wires.
In the distributor is the hall effect sensor that creates a pulse for each cylinder lobe that passes, TFI module reads the pulse and sparks the coil, spark runs back to distributor and rotor sends that spark to cylinders spark plug wire.
So it is the same as a points type system but no points to wear out and adjust all the time.
The hall effect pulse is passed on to ECU so it can time fuel injectors, so if there was no spark and no fuel(on spark plug tip) then could be TFI module or hall sensor issue.


The "letting go of the key" stall was a common issue on older systems.
There was a ballast resistor that was used for the Coil that reduced the "running" voltage of the coil to 8volts to make it last longer, during starting the coil got full voltage for hotter spark, but when running the coil voltage was reduced because hotter spark is not needed.

So when key is in START position the voltage to coil is traveling on a separate wire, than when key is in RUN position, so if engine starts but as soon as key goes back to RUN the engine dies then voltage to system is being cut.
You will see that in the TFI link above, separate START and RUN wires on TFI module wires

You have the problem in the RUN circuit, could be in the wiring or even ignition switch.
With key in RUN position check for voltage at the coil's + terminal


No, I haven't seen a DuraSpark or HEI conversion for 2.9l, could probably be done but fixing TFI system would be cheaper

 

Thank you for the reply. I have 12v at the coil with the key in the run position but I need to do a little homework on how the TFI module fits into the system. Thanks again!

 

There were 2 TFI modules, 4 if you count remote mounted(not on distributor).

They are not interchangeable.
Good read here on that: http://www.myo-p.com/Ford-EEC/EEC%20..._or_black.html

 

Hello Forum members,

First of all I want to appreciate the forum creator for connecting Ranger owners. I am in need of some assistance getting my ranger back on the road. I am currently getting crank no start no spark at the coil. I have fuel at the rail checking the valve stem. I have a fully charged battery and with the help of the forum and similar websites was able to complete as many diagnostic using the multimeter and test light as possible.

I was able to test the connector at the TFI for 12V on run and for ground not start . I have 12V going to the coil and upon cranking 9V. With the test light I was able to see pulsing with at least a test light. The ranger has being in the family since new and the distributor and coil seem original. Because of the rush I purchased new cap and rotor because there was some corrosion on the cap.

I currently have no spark coming of the coil with a new wire. I installed a new distributor and coil and installed it a TDC. I have a secondary ignition switch thinking of installing but the truck is cranking and fuel pump is turning on.

Does the ignition switch pay a part in the spark issue?

Any advise would be greatly appreciated.