You need to go after the fuel pressure problem as it will cause other codes to appear. Did you take a look at the FPDM?

 

I did. I physically Unplugged it and inspected the plug to see if there's any corrosion or damage I don't see anything wrong with it and then I Left it unplugged and started it and it dies. My fuel pressure was around 46PSI


I am beginning to suspect MAF ?

 

Also originally I suspect it clogged cats but is the temperature test pretty safe To assume it would be accurate? I get 460° before the cat and 560° after the cat and from what I've read it should be between 80 and a 100° hotter after the cat, Then that would mean that the converter is good

 

It won't run for more than a few seconds with it unplugged.
Aise from the condition of the connector, the FPDM body itself gets corroded on the back side where it touches the frame, sometimes to the point where it causes problems as the flaking aluminum falls inside on the circuit board.

You have 100% checked all the intake piping for obstructions? I say this because an air blockage could explain a rich condition.

 

The module appears to be fine, Is there any way to test its performance? I'll double check it when I get home but yeah all the intake piping is clear. From what I can access anyway. I ran it with The intake piping and filter off of it and I still Have the same symptoms

 

When it died on me and I got it running again I guess the sound is more of a whistling sound and it does it constantly when I accelerate. It's coming from the driver's side I suspect vacuum leak of some sort but I really have no expertise In that or even know what vacuum lines to look for

 

OK Watching live data of the short-term fuel trim, Bank one bounces back and forth always within range... Bank 2 is at -26%.


If I unplug each injector one by one on bank 2 And watch how the trim reacts, it runs within normal range as Long as cylinder 8 is plugged in with The other 2 . Then if I unplug the cylinder 8 and run just the other 3 it's within normal range. So it seems to me like cylinder 8 injector is spraying too much fuel . In other words when I unplug 5, 6 and 7 one at a time, 8 is Spaying so much fuel that it balances the entire bank out. Then on the opposite spectrum if I unplug 8 and run only 5, 6 and 7, bank 2 balances out into normal range also, Then the moment I plug in 8 (w the other 3) it slowly climbs up to -26 again.


So I'm thinking cylinder 8 has a bad injector? No idea if this thought process is right it just kind of makes sense to me , so hopefully the experts can let me know if this is plausible.

 

Daran,
Did you check the back side of the FPDM? Its held in place by two bolts, remove these and inspect the back cover for corrosion damage that exposes the circuit board. It is a very common problem with 2004 - 2008 F150s. We need to make sure it is not causing the other issues.
jimboy

 

OK i took it off ..yes the back cover was corroded, bent and cracked. I Had to forcibly pry it open and then it just split in half. The board looks like fine tho. It's nice and clean.. What do you think about injector 8? I may not have explained it well this is what I meant.

When test running these cylinders:
5,6,7,8 : rich
6,7,8 : good
5,7,8 : good
5,6,7: good

5,6,7, good. then plug 8 back in : climbs rich

Duplicates every single time

 

good you found the fpdm before it left you on the side of the road (which likely would have been in poor conditions).

re: injectors, I would would buy a set of orings, re ring them all, swap #8 with #1, then rerun tests. See if conditions follow the swap.