Vegasmachine

Here is the latest issue with the truck. It starts fine in the morning 5AM but after i get off work at 2PM the truck has to crank for a good 5 or 6 seconds before it will start and when it does it stumbles quite a bit until it gets itself together and starts running normal (another 5 seconds or so). After that it will start without this issue. Not sure if the outside temperature is a factor but its Las Vegas and its been around the 100 degree mark and the truck is black so i know its cooking under the hood.

Ideas?

Thanks

ColdinCanada

Certainly heat related. Does it feel like the engine is "running on fumes" for those 5 seconds before it begins nor,al operation?

Martian

Crank no start - could be your battery (temp related) or its connections.

Mod (Ret.)

I doubt this is heat related. Before our year trucks ('04 to '08), Ford changed to a single feed fuel line, and eliminated the fuel pressure regulator valve. This new single fuel line helps prevent vapor lock and fuel "boil".
The fuel injection rails have a fuel pressure sensor, which informs the PCM/ECU to cut off power to the fuel pump via the FPDM (fuel pump driver module) located by the spare tire. This module "turns on/turns off" the fuel pump in the gas tank to regulate pressure in this single line.
With the older fuel delivery systems, there were two fuel lines: a send and return line. Fuel was pumped back into the gas tank with by control of a fuel pressure regulator via the return line; this was problematic in the way of fuel vaporizing due to heat. It was eliminated with the new system.

ColdinCanada

Darn, this is where I was going. Ruin all my fun.

Vegasmachine

I would say yes to the running on fumes, very much sounds like it's starved for fuel. As far as cranking it does start , just takes a bit to get it to start. Battery is new it turns the engine over just fine. This only happens when it sits outside in the sun all day.

Thanks

Hongstertruck

I bet you a cup of java that your warm start issue is due to on its way out but not totally dead crank shaft position sensor.

My second guess would be leaked injectors.

Vegasmachine

I was under the impression that the crank shaft position sensor was one of those items that didn't go bad that often.

Thanks

Hongstertruck

It's rare but it's there.