1998 Ford F150 4.6 liter - The symptom is described as not starting after the truck warms up; it will turn fine, it runs fine, no OBDll codes. It always starts fine when its cold or has been sitting for an hour. Any help would be appreciated starting with the cheap/easy things.

 

You could try replacing the cylinder head temperature sensor. I had a similar issue except mine would start after a minute or so. I replaced this and have not had a warm start issue since.

 

Will give that a try tomorrow. Its a cheap part and easy to install.