1994 F250 - No spark after coil
 

1994 F250 w/5.8L stopped while driving at 25 mph. No spark at coil spark
terminal. I do have 12volts showing at the + coil terminal. I replaced the
coil still nothing. I had the ignition module tested at Napa. Tested OK.
Any thoughts appreciated.

I've found that I only have 1 volt coming out of pin 4 ICM during cranking.
Manual calls for 90% of battery voltage during cranking. I follwed this
yellow with black striped wire to the PCM where it is located at pin 4
there also. Tested voltage directly out of PCM - still 1 volt. Does anyone
know what function the pin 4 for either ICM or PCM is supposed to perform?

Sounds like you are missing the wire from the starter solenoid to the
coil that provides power to the ignition when cranking.

The ICM only puts out voltage when the key is in run, not start.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

lucasred wrote:
>
> I've found that I only have 1 volt coming out of pin 4 ICM during cranking.
> Manual calls for 90% of battery voltage during cranking. I follwed this
> yellow with black striped wire to the PCM where it is located at pin 4
> there also. Tested voltage directly out of PCM - still 1 volt. Does anyone
> know what function the pin 4 for either ICM or PCM is supposed to perform?