Hello all

Hoping to get some help on an issue that I'm having a tough time with on my 2004 crew cab with 4.6. 218,xxx miles. Been a great truck for a couple years but the other night it died on me on the freeway. Started shaking and bucking a bit and just lost power. Coasted to safe place and tried to re-fire but just would crank and not start. Had to get hauled back home on a rollback

Nothing obvious upon visual inspection. As I was waiting for the tow truck I plugged my Scangauge 2 in to see if I could pull up any codes- there were none at the time. Next day I started by checking for spark, which I have. What would happen is it would start, run like crap for a second or two then die on the first try. Any attempts after it wouldn't even try to stumble and fire unless it sat for a bit. Next thing I wanted to check was fuel pressure on the Scangauge 2. Tried unsuccessfully to get it to monitor fuel pressure but when I first hooked it back up again, I found it had P0300, P0305, P0307 and a P0340 cam sensor code. Cam sensor is easy and was only $20 so I replaced that. Still no change. Ended up getting a better scanner that could read fuel pressure off the sensor. Turns out I now had a p0193 fuel pressure sensor high circuit code. Now here's where the weird part comes in- I have normal pressure (38-42 psi) key on/engine off but when I crank it, my fuel pressure goes from about 55 minimum and spikes to 79.8. I work for a parts store so I can get away with a little loading of the parts cannon, so to speak. Tried a new fuel pressure sensor and no change. Tried a fuel filter just to try something plus I don't know the last time it was changed and wanted to do it for maintenance. No change other than it seems like it doesn't even want to run on an initial start anymore. I've heard about some possibilities of wiring issues and a short to reference voltage. I could understand that but why wouldn't the pressure read high all the time even with key on/engine off if that was the case? Don't think I've heard of this before. Any direction and assistance would be greatly appreciated. I'm trying to get this old girl going and running for one last summer before I retire it.

 

Just because the sensor says you have fuel pressure does not mean you actually have that much pressure.
See if it runs fine with squirts of ether (starting fluid)
007

 

fpdm?

 

That is what I am thinking
Replace the fuel pump delivery module
I do not think his 04 has a FPRM (relay module on the frame) but it would be worth looking for one, just in case
Good luck
007

 

the FPDM is on the frame near spare tire.

 

Likely Fuel Pump Driver Module (FPDM) as previously mentioned. Remove FPDM (above spare tire) and inspect aluminum cover on backside, they corrode away and expose circuitry to elements. While you are back there check and clean the ground wire for the FPDM. If you are in the rust belt, check grounds near fuse box inside cab at passenger's kick panel.

 

That's just it, he will not find one (relay or driver module) on an 04
Those started being installed in 05
007
It's worth checking for one though.

 

do you have any reference for 04 not having one?

 

A new body style (not heritage) has a fpdm. I own one.

 

This is correct. Only the 04 Heritage F150 did not have an FPDM. All other 2004 F150 NBS trucks had them (first year).