I just bought this 88 F150. It has a 5.0 and 5 speed. I was able to get it running for a couple minutes, but now it will only crank, with no start. It is getting fuel.

I have already replaced the ignition switch, TFI module, both relays on drivers fender, and coil with known good parts.

My multi-meter is broken, so it will be tomorrow before I can start checking voltages.

What else should I be checking? The previous owner stated that he has already swapped the distributor, so it may not be the pick-up.

Also, will a computer from a 87-91 truck with a C6/aod work in my truck? What about one from a e4od truck?

ETA: before the multimeter broke, while I had the battery charger set to engine start, I was seeing 18v to the coil. I was under the impression the voltage regulator should regulate it down to 14.2? Or is that only power that is supplied by the alternator?

 

The pickup in the distributor instructs the module to fire the coil.

This should help for ignition-system diagnosis:

Ford Ranger/Bronco II EEC-IV Testing

Computers are tied to Calibration Codes - 49-state or California emissions, low vs high altitude, etc. etc. etc. While one from an auto-tranny-equipped may work, I wouldn't expect it to work well.

The regulator should keep the current generated by the alternator in check, I don't know if that's true with an outside power source.

 

Try putting a new disributor module on. The little grey box on the distributor. I think it's a 5.5 socket to take it off.