I have a 1997 Ford f150 4.6 v8. It has no problem starting cold runs like a champ but when it is warmed up and shut off it will not start until the motor is cold. I replaced the crankshaft position sensor and still has the same problem. Please help

 

The cold start and hot start routines are the same.
The difference is the CHT sensor and Intake Air Sensor has different values due to the temperatures, as the way the computer knows the difference between hot and cold starts for applications of fuel, ignition and timing.
If there is a temperature sensitive issue with a connector it could be the cause.
The IAC could stick closed. To test for that, hold some throttle on while cranking to give the motor some air.
If the engine runs from a cold start it's not likely that would be the issue.
Some one needs to use a Scanner to look at live data for the possible issue.
Are there any codes or CEL light set?
You have to go beyond changing parts and guessing.
Good luck.

 

Please define "will not start" - does it crank but not fire or does it do nothing when you turn the key?

 

jbhz, I deleted the other thread you started on this problem. Please don't create multiple threads on a common issue because it leads to confusing responses that can waste your time.

- Jack