There are CPS(cam position sensors) and CKP(crank position) sensors, those are my names for them, just so I can talk about them without confusing myself, lol.
I don't think the '92 4.0l had a CPS, but it could have, it would be in the never used "distributor hole" at the back of the block top side.
CPS isn't used for basic spark timing.
Ford EDIS system is self contained spark system, it has 3 parts:
CKP(crank position) sensor
EDIS-6 module(for V6)
Coil pack
CKP sensor wires run to EDIS module
Coil pack wires run to EDIS module
EDIS module and Coil are both powered by the ECU(EEC) relay found in the Power box in engine bay.
Just check coil for 12v with key on
Coil has 4 wires, Red one is the 12v
EDIS module pins are here:
http://www.dainst.com/info/edis/edis.html
Toward the bottom
VRS(variable reluctance sensor) = CKP sensor
The way it works is that the CKP sensor will generate an AC Voltage as the "teeth" on the crank wheel spin passed it, there is a missing tooth or wider tooth on the wheel that denotes #1 TDC.
This pulse tells EDIS module to start the spark, so it all starts with the CKP sensor pulse, no pulse = no spark.
If you hook up a volt meter to the CKP sensor and crank engine you should see about .5 to 1v AC
i.e. if you unhook the EDIS wires from the module and test the VRS+ and VRS- wires with volt meter you should see the AC voltage while engine is turning over, this would test the sensor and wires to sensor
EDIS module sees the pulse and starts timing for spark, #1 TDC being the starting point.
The EDIS module passes this #1 TDC info to computer along with RPMs(from CKP sensor)
Computer uses that info to time the fuel injectors, and starts them about the same time as the spark.
If you crank the engine and then pull a spark plug out and it is wet, then CKP sensor and EDIS timing signal is getting to the computer.
If spark plug is dry then either gas tank is empty, lol, or computer is not getting a timing signal from EDIS module.
Google: How to test ignition coil pack the easy way
There is a short video on how to test for a bad coil, although I wouldn't think all 3 coils in your coil pack could fail at the same time.
So either coil doesn't have 12volts or EDIS module isn't grounding it(firing it)
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