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Lincoln 5.4 3v issues

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Old 06-30-2016, 11:06 AM   #1
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Default Lincoln 5.4 3v issues

Hello everyone. I have a 07 Lincoln Navigator with the 3v 5.4 that is having some issues. It has 115k on the odometer and have had no issues until about 6 months ago. The fuel pump went out and was replaced everything seemed good to go. Now I m getting a couple codes P1719, P0171, P0174. With the scanner my LTFT on both banks is 28 and STFT is -4 to +4 these readings stay the same at idle, 1500rpm, and 2500rpm. I can not find any vacum leak anywhere, have cleaned the MAF sensor, checked fuel pressure at idle(30psi). 02 Sensors run as follows 02S11 reads .105, 02S12 reads 0.765, 02S21 reads .105, 02S22 reads 0.745 all at idle. I removed a vacumn line and sprayed a little carb cleaner in and all 02 readings went to .8-.85 almost instantly then returned to normal a few seconds later. I am not sure what else to look for on this thing. What would be your next step? When you start the motor it can take two or three key cycles to get running, but runs smoothely once started. Power seems to be there and you can drive all day sometimes without a code. Once the code kicks in the truck goes into limp mode I assume and seems like it sticks in 2nd or 3rd gear. I work on outboards fairly often so I am mechanically inclined and have a Actron 9690 scanner. trying to avoid the 2 week wait period at the Ford dealer and a small shop locally couldnt figure out what was wrong with it.
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Old 06-30-2016, 11:10 AM   #2
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Fuel filter?

Foam around air filter tray?
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Old 06-30-2016, 11:17 AM   #3
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Fpdm?
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Old 06-30-2016, 07:16 PM   #4
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The fuel filter was replaced with the pump, but I just changed it again just to make sure with no luck. I went and bought a new MAF sensor as well with no luck. Changed all plugs too ( one broke but the tool worked). I may just have to wait it out and drop it off at the dealer. I do not like to admit defeat, but this one may have got me.
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Old 06-30-2016, 09:36 PM   #5
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Quote:
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The fuel filter was replaced with the pump, but I just changed it again just to make sure with no luck. I went and bought a new MAF sensor as well with no luck. Changed all plugs too ( one broke but the tool worked). I may just have to wait it out and drop it off at the dealer. I do not like to admit defeat, but this one may have got me.
Did you check the FPDM?
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Old 06-30-2016, 09:39 PM   #6
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I looked for it and could not find it. Called ford and they said it is included the fuel pump assembly that was replace in the tank?
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Old 06-30-2016, 09:50 PM   #7
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I looked for it and could not find it. Called ford and they said it is included the fuel pump assembly that was replace in the tank?
I don't know I could be wrong but I believe it is supposed to be on the frame rail on the 3v motors. Like I said I could be wrong but I don't think so
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Old 07-01-2016, 08:47 AM   #8
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I don't know I could be wrong but I believe it is supposed to be on the frame rail on the 3v motors. Like I said I could be wrong but I don't think so
07 Lincoln Navigator with the 3v 5.4 may not have a FPDM on the frame rail
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Old 07-01-2016, 08:57 AM   #9
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Well Rockauto says you have a FPDM


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Old 07-01-2016, 09:40 AM   #10
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I looked everywhere on inside and outside both driver and passenger side frame and could not find one. Lowered the spare tire and looked there as well. If it has one it is hidden very very well.
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