My girlfriends truck is doing the samethhing, it cranks but won't start, I parked it in the backyard about a month and a half ago and when I went to start it 2 wks after I parked it and it turns over but it will not start. I'ts a 2001 Ford F150 5.4. I have checked the fuses and relays, all good. I cleaned all the ground cables I could find so far. Also hooked up my scanner and got a code for CHT, cyclindar head temp sensor.