2001 expedition intermittent long/ no start

[Todd Gilbert]

Hi guys,
I have a 2001 expedition 5.4 4x2 that is having an intermittent problem starting. I have recently replaced the CHT and MAF due to faulty sensors but I am still having issues getting it to start sometimes. Fuel pressure is good and no codes on obd2. Could it be an issue with the PCM? Any help is appreciated.

 

[Flexpedition]

I'm not sure what a CHT is, but wonder what fuel pressure readings you were seeing? I believe there are two readings, one KOEO and the other KOER - key on, engine off and key on, engine running respectively. Each has a PSI range that is acceptable.

 

[Todd Gilbert]

CHT is cylinder head temp sensor. The fuel pressure primed at 40 psi and running was around 35.

 

[Flexpedition]

Gotcha, I incorrectly tried to think there was a coolant temperature which told the PCM how to start the truck when cold. Is your long cranking issue exclusive when the truck is cold?

 

[Todd Gilbert]

No it's anytime. It can be hot or cold.

 

[Todd Gilbert]

Finally found my problem. It was a corroded connector at the fuel pump.