Alrite guys this is the deal i have a 99 f150 with the 5.4L v8 4x4 6" fabtech lift and 35" tires.

Well recently i had some problems and posted on here and still have not gotten it fixed yet..

The deal is if you start it up and rev it up it runs great for the first 10 seconds reving good and revs out good and everything. Well after that 10 seconds the truck starts to chug and loose power it just starts chugging and dieing out.. I dont understand it cems like a loss of fuel or something else i just cant figure it out at all.. I NEED HELP!

The deal is the truck ran great the nite it died to the ice where we were ice fishing then i shut it off after driving around and got back in it and nvr ran the same again. but the trans shifted right before that and then all of a sudden all of this. doesnt make any sense, and it isnt a coil or injector sticking or plug they are all good if i start the truck let it run and it starts to run bad and individually unplug each injector or coil the miss changes not stays the same...

Well i have a edge programmer and ran the codes with that and ran the codes with my other reader i have.
The codes are:
p0147 which is manufactural control transmission
p0755 shift solonoid b
p0747 which is torque converter circuit
p0141 which is 02 sensor bank 1 sensor 2
p0161 which is bank 2 sensor 2

Well i went through the truck and made sure the 02 sensors were plugged in and they were.
*i checked all the vacuum lines no leaks and all the lines are good.
*cleaned maf sensor made sure its good
*changed fuel filter
*changed fuel pump
*changed fuel regulator on line
*cleaned throttle body
*changed alternator (wasnt charging battery now it is good)

Grabbed a fuel line tester and got 36 psi when trucks running but if i pull the vacuum line of the fuel regulator and just let the line sit there and the regulator sit there the fuel psi climbs and jumps up to 40 or 41 psi (note: it still does run rough thou and still no power but fuel rail pressure becomes right)

I dont understand what it could be i have changed everything that i could see possible to cause this problem with the truck.

I need the truck fixed this week and sick of dumping money into it.. I need some options things to check or so... i am dumbfounded...

please help guys!!!
throw me some ideas... I am lost

 

My mistake.

 

what?

 

You need 40+ pounds of fuel pressure. It sounds like the pump isn't able to keep this 40+ pounds to the injectors. You say you replaced the pump and the filter and the regulator? You have a slew of codes and I'm not exactly sure where to start other than you need more fuel pressure.

Have you looked over all the vacuum lines? I'm going to sound something like a broken record but have you tried running some seafoam through the pig?

 

i know i need 40psi or more i tried my buddys whose idential and his is around there.. and i understand that but even if i pull off the vacuum line that goes to the regulator off it pegs out exactly to where it should be. still runs bad.. i dont uderstand everyhting you asked me has been replaced.... and yes all the vacuum lines have been looked over no leaks all newer hoses.... and yes ran seafoam also.....

 

Have you disconnected the battery? If not pull the hot terminal and let the sucker sit for 15 minutes. Maybe a little longer I can't recall how long it takes the comp to reset itself. Then reconnect and start. see what happens.

Does the truck have a tune on it currently? and if it does can you return it to its stock tune and see what happens?

 

did the battery and still nothing and it is returned to stock

 

well damn. do have full coverage? It might be time for a short in an electrical component near the gas tank.

All kidding aside you might have a short somewhere.

Your throwing a lot of codes, and I don't think they are all inter-related. It could be compounding problems causing this.

maybe the pcm took a dump on you

Seems like you went over most of it.

One more thing to try.

disconnect the O2 sensors. This will give you a cel. But don't worry about that. The truck should run on its default settings. If it improves how its running replace the O2 sensors if not. . . . stand back and flick. . .

 

lol yea its part of me could never get rid of it lol...but idk i think im going to pull the main wireing harness tommrow that goes to the trans and unplug em all and replace i have a extra one i believe.. but i checked and wires dint seem melted i really dont know i am confused..

 

Before you pull the whole wiring harness disconnect the O2 sensors. geesh.
only takes a couple of minutes to find out.

I do happen to have an extra 5.4 engine wiring harness lying around. LOL

 

i do 2 lol.. but the harness is a quick disconnect... but yea ill give it a try.. see what happens i guess.....

 

Fuel pressure is fine. Fails are 29 psi for the 4six and 31 psi for the 5fours.

Yes, you have a wiring problem, 90% positive. One that should be obvious upon inspection. The only other possibility is PCM, but I'm just about positive that isn't the case.

The giveaway is the O2 DTC's. Those just aren't O2 codes, they're circuit faults. Heater circuit faults indicating the two white wires (heaters). 141 and 161 points directly to the wires in most cases + you have trans circuit faults to boot. Somethings getting pinched and finally severed.

They like to pinch on top of the bell housing, back of the motor. Sucks getting to them, since the only way is to remove the manifold. They're pinned to the top of the trans at that location. That should be the last place to check, but if I had to guess.....

 

Check all your fuses.

 

Did you happen to put fuel in the tank the day you drove to go fishing? Any chance you got bad gas?

 

well i was told fuel pressure is 40psi even the books say that..
but still anyways i checked the wiriing and mine isnt held by the top i checked it i think im going to disconnect it and pull all off and see if any breaks or rubs in wires...
and no it was the same amount of gas and then i went and put more gas in also and i put seafoam through it and injeector cleaner.. I really am baffeled i dont know what to do...
what fuse would i check? like for what? i mean cant be fuel pump because it runs great right away but then just dies.. i dont understand guys

ill check the wiring today hopefully and go from there....