Anyone here want to help me with a ford issue? This is the only reliable forum I know (Page 1/5)
HIOSILVER! OCT 11, 09:06 PM
Been here for 15 years. And despite going on other forums for tech information with other vehicles i have never come across a better group of people helpful wise. Once again i find myself on other forums trying to find some advice and dont usually get far so i come here.
What im struggling with is below. Im lost I dont know where to go from here. Anyone have any ideas i havent tried yet?

2002 F150 with the 5.4. Truck died. No sound from pump. Tried to scan truck but would not link with my scan tool. Changed both pcm and fuel pump
relays. Still wouldn't connect to scan tool. But fuel pressure at rail was exactly 40 psi. But could not hear pump. So fast forward changed the pump and filter but psi never changed went higher than 40. But truck started and ran fine. Not only that but scan tool worked. weird right? Only code was pcm didn't complete cycle. Cleared it and started driving truck put more gas in it. And it still stalls. Sometimes starts sometimes doesn't had to be flatbedded home. Got it home and left it overnight. Fired right up the next day. What the hell? Just let it idle for awhile went back out in the rain and it had died again and wont restart.
what do I do now gents? Bad pcm? I'm totally at a loss now on what the issue is with this thing and I'm here hoping you folks could help guide me on what I may have missed.
thanks for listening.
rich
blackrams OCT 11, 09:30 PM
Not enough information for me and I'm not a certified auto technician but,...............

Did you clean out/flush that fuel tank when you changed that pump? (Most fuel tanks are carrying a lot of trash and crap around in them.)
Install a new fuel strainer?
Replace any other fuel filters?
Have you run any injector cleaner through the system?
Any kinked pressure feed or return fuel lines?

Sounds to me like your engine is starving for fuel.

Does this happen only when the engine is warmed up?
Any other engine codes popping up?

[This message has been edited by blackrams (edited 10-11-2017).]

Stubby79 OCT 11, 09:32 PM
Have you tried scanning it since it started working again? Can you scan the PCM after it's started? can you still after it's died?
MidEngineManiac OCT 11, 09:37 PM
Did you move a fuel line close to something hot while working on it ? I'm thinking potential vapor lock.(check the simple stuff 1st)
Lambo nut OCT 11, 10:07 PM
Not linking with the scan tool would seem to be a pcm problem. Not that the pcm itself is bad as it could be due to a faulty ground or other wiring problem.
Tony Kania OCT 12, 12:17 AM
Passenger side firewall. Look at all the connections. Clean any if necessary.

Look at fuse for fuel pump. It can be semi blown.

Check wiring for emergency fuel shutoff at passenger foot well. Perhaps a pinched wire?

If there are continuous codes and a problem is not remedied, a less expensive scanner (like my own and pertaining to my 1997 F150) will not be able to read codes. The continuous codes thrown do not allow the pcm to learn.

That is all I got.
Lambo nut OCT 12, 12:24 AM
Let's simplify.

Truck starts and runs, can read with scanner.
Truck dies or won't start, can't read with a scanner.
Would this be correct?
Khw OCT 12, 12:48 AM

quote
Originally posted by Lambo nut:

Not linking with the scan tool would seem to be a pcm problem. Not that the pcm itself is bad as it could be due to a faulty ground or other wiring problem.



As I read his post this is what I was thinking as well.
OldsFiero OCT 12, 07:54 AM
I believe that has a fuel pump control module mounted on the frame near the fuel tank. We've seen many that were coroded through the housing down here in salty upstate NY.
Marc
Lambo nut OCT 12, 08:17 AM

quote
Originally posted by OldsFiero:

I believe that has a fuel pump control module mounted on the frame near the fuel tank. We've seen many that were coroded through the housing down here in salty upstate NY.
Marc



That doesn't explain the not linking with the pcm problem though.