I have 91 Ranger XLT 3.0L v6 5-speed.
It’s new to me and it was running fine when I bought it 3 months back.
One morning it would not crank - just nothing when turning the key. Turned out to be a bad starter. Ran fine again for 2 weeks.
Then it would crank but not start. I measured voltage at the pump and was only getting 6.5v - not 12v and then backing off to 6. Only 6 at all times the key would be turned. I had no fuel pressure and the pump never primed. The pump did prime when I fed 12v star right to it so I knew it was good. This turned out to be the fuel pump relay. It tested ok once and then seemed to die. Replaced relay and pump primed normally so I was sure this was it.
Same symptom - crank, no start.
I sprayed starter fluid into the throttle body and still got no start so now I know its a no spark problem. I put a spark plug tester in cylinder 6 and see just a single spark while cranking. I test between the ignition coil and distributor and see just a single spark.
I replace the remote mounted TFI/ICM ignition control module because all sources said this was the most likely failure since it coordinates spark. No difference - crank no start.
I’ve got correct voltage at the TFI, distributor, and ignition coil. Based on everything I’ve done, I’m not down to the rotor (unlikely, but cheap and easy), and the pickup coil.

any other ideas?