5.9 Magnum help needed

I used to do the key flashing thing on my 96 until I got a code reader from Harbor Freight, which is much simpler, plus lets you erase the codes. I recall it was only ~$30. I saw them on sale recently for ~$40. I agree that you should get some flashes even if no codes are set. I recall that "5 5" signals "end".

To eliminate the timing chain, valves, pistons, etc, remove a spark plug and hold a finger over the hole as you crank the engine. You should feel strong compression. You only need to check 1 or 2 cylinders. Best to disable the spark by clipping the coil output to ground. Your coil is at the front of the engine near the alternator, with a long spark wire back to the distributor, at least on the Magnum engines I have seen.

If the compression is good, since you have fuel pressure and spark, that points to the fuel injector drive circuits. The best check is "noid lights" that you place in-line to verify they are getting voltage. The control is fairly simple. One wire is +12 V, after the ign, fuel shut-off, and fuses. The other wire is pulled to ground by the computer to turn on the injector, for each short pulse. With a multi-meter or test light, you could check that you at least have +12V on one wire, with the ignition on. However, don't quote me since there could be interlocks that only apply the +12 V when the engine is turning (pretty sure not). If you measure +12 V, try grounding the other terminal briefly and you should hear the injector click on.