After completing an engine swap, the engine cranks but does not start

This sounds like it is a control issue and not necessarily a failed part.

So, is the theft light remaining on when you are turning the key?

https://www.2carpros.com/articles/how-to-reset-a-security-system

If the theft light is not staying on or flashing, then we need to know what engine you installed in the vehicle and what it came out of so that we can pull the info on that system and start tracking why we don't have spark.

Also, we should check and see if there are codes in the system which would point us in the right direction. Here is a guide that will help with this:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

However, in most cases if you are not getting power to the coil then the PCM is the issue.

Clearly that is a guess at this point so let's start with this info and we can go from there.

Thanks

Okay. Couple more questions so that I can get you the accurate info.

What engine did you put in the vehicle and what did it come out of?

Also, when you turn the key to the on position does the theft light go out.

Okay. Got it. So, this is going to be a little more difficult for us because we don't have an inline 6-cylinder engine, but this vehicle is closest to a Taurus which is sold here in the USA.

So, here is a guide that will help with checking for spark which is where we should start:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Next the way to check the coil is to see if it is getting 12-volts on the terminal coming from the power source which will be a fuse.

I attached a wiring diagram below for reference.

Then depending on how many coils you have, there will be a wire coming from the PCM which is what is used to interrupt the 12-volt signal to create the high voltage spike needed for the spark plug.

Basically, this is going to normally be a ground through the PCM but if you have a single coil then you are not going to have the A, B, C as shown.

Let's check for voltage here and go from there all assuming that you have no spark at the plug.

You are correct that the one with 12 volts is the power supply. However, if you have 3 other wires, more then likely you have 2 coil packs, and the other is the return to the PCM.

If you want to get a picture of this that will help but normally a 4-pin connector on a coil is one power supply, one PCM return, 2 coil packs. So, these two coil packs will feed 3 cylinders each.

Yes. That is correct. Technically the primary and secondary circuits are internal to the coil but the wires coming from the PCM are to create the voltage spike for the coil.