new guy needs help
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New User
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new guy needs help
hi guys, first time asking for help. i have a 2004 f-150 fx4, 5.4 3valve.
it starts hard, wont rev up, and has no power at full throttle. it have four codes-p0171, p0174, p0190, and p191. ive changed the intake gaskets and the spark plugs, helped a little but problem still there. the truck has 100k miles on it and i do run it hard. its always work hard and never let me down until now. if any one can help, please do.
it starts hard, wont rev up, and has no power at full throttle. it have four codes-p0171, p0174, p0190, and p191. ive changed the intake gaskets and the spark plugs, helped a little but problem still there. the truck has 100k miles on it and i do run it hard. its always work hard and never let me down until now. if any one can help, please do.
Lead Driver
Joined: Dec 2012
Posts: 7,877
Likes: 49
From: Tennessee
174 and 171 are lean codes bank one and two . 190 is fuel pressure code . Start with fuel filter, then pressure test . Most likely though you need a fuel pump . Start with the basics first . If you have a scanner that would help !
Lead Driver
Joined: Dec 2012
Posts: 7,877
Likes: 49
From: Tennessee
Parts fail . Check your fuel pressure . Did you change the filter ? Some do not have one , I think yours does . If fuel system is good ck mass air flow sensor . You have a 5.4 . It should read 5 to 6 grams per second at idle with no load ( ac, ect. ) Make sure it is clean . If you have an aftermarket air filter system , make sure it does not have too much oil on it .That will ruin a MAF sensor .A scanner with data would be great . Ck fuel trims , 5 plus or minus is good more or less shows a problem .
Fleet Owner
Joined: Mar 2012
Posts: 26,155
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From: Near Cal. Avenue
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New User
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well changed the filter and cleaned the mass air, and checked all the plugs for the fuel system both under the hood and truck, even on the tank, which was not easy, every thing looks good but still no power and same codes. any other ideas?
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Fleet Owner
Joined: Mar 2012
Posts: 26,155
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From: Near Cal. Avenue
Check fuel pressure and sensor. If fuel pressure is low check the most likely. Until fuel pressure is right nothing is right. It is main problem.
Most likely cause is the fuel pump driver module. Check the circuits of the Fuel Pump Driver Module (FPDM) to verify the cause of the problem.
The White (W) wire at FPDM pin 5 should show battery voltage, whenever the ignition key is on, from the fuel pump relay and inertia switch.
The Black/Yellow (BK/Y) wire at FPDM pin 3 is a dedicated ground for the FPDM.
The Pink/Black (PK/BK) wire at FPDM pin 4 is power out of the FPDM feeding the fuel pump. This circuit should show battery voltage whenever the key is in the run position.
The Brown/White (BR/WH) wire at FPDM pin 2 is the fuel pump ground circuit. This circuit is duty cycled with a ground signal from the FPDM based on the command from the Powertrain Control Module (PCM). Back probing this circuit with a jumper wire and grounding it should result in 70+ PSI of fuel pressure if there is power to the fuel pump and the pump is good.
The White /Yellow (W/Y) wire at FPDM pin 6 is the command signal sent from the PCM to the FPDM. The voltage on this circuit is generally a 1-5 volt reading, the higher the voltage reading, the higher pressure is being commanded.
The Light Blue/Orange (LB/O) wire at FPDM pin 1 is a feedback signal sent from the FPDM back to the PCM
The White (W) wire at FPDM pin 5 should show battery voltage, whenever the ignition key is on, from the fuel pump relay and inertia switch.
The Black/Yellow (BK/Y) wire at FPDM pin 3 is a dedicated ground for the FPDM.
The Pink/Black (PK/BK) wire at FPDM pin 4 is power out of the FPDM feeding the fuel pump. This circuit should show battery voltage whenever the key is in the run position.
The Brown/White (BR/WH) wire at FPDM pin 2 is the fuel pump ground circuit. This circuit is duty cycled with a ground signal from the FPDM based on the command from the Powertrain Control Module (PCM). Back probing this circuit with a jumper wire and grounding it should result in 70+ PSI of fuel pressure if there is power to the fuel pump and the pump is good.
The White /Yellow (W/Y) wire at FPDM pin 6 is the command signal sent from the PCM to the FPDM. The voltage on this circuit is generally a 1-5 volt reading, the higher the voltage reading, the higher pressure is being commanded.
The Light Blue/Orange (LB/O) wire at FPDM pin 1 is a feedback signal sent from the FPDM back to the PCM
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New User
Joined: Mar 2008
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every thing ive heard about the fpdm says if its bad the truck wont run, is this true because mine runs and drives, just no power when you step on it. instead of taking off, it falls flat on its face and back fires. can the fpdm do that?
Lead Driver
Joined: Dec 2012
Posts: 7,877
Likes: 49
From: Tennessee
I work on a fleet of crown vics . I work on a lot of F series trucks . I can only think of one FPDM in 8 years that was bad . It was because of an idiot with a drill and a self tapping screw trying to mount a fire extinguisher .WTF was he thinking ! The same idiot that ran a screw through the rear heater core a Caravan !
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New User
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well i replaced mine because where they mount them on my truck the road salt eats away at the housing and it gets wet inside of it. but when i replaced it it was because the truck didnt run at all, thats why i was asking if it can just not work right, i thought it was one of those things that if it didnt work the truck wouldnt run.
Lead Driver
Joined: Dec 2012
Posts: 7,877
Likes: 49
From: Tennessee
I do not live in the salt belt .So my work is different . If you have salt issues , ck wiring connectors. Yes , a module can not work properly . Look at Papa Tigers post for that . But I see a lot of issues with pumps and filters . When my local Ford dealer keeps 30 pumps in stock for 07 crown vics , there is an issue .F series , not as much , but still problems . Filters plug , burn out pumps .
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New User
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sorry it took so long to get back,life got busy. i changed the fpdm again, still same problems. does any body have other ideas, ive heard maybe fuel pressure sensor. is there a easy way to check it?
Fleet Owner
Joined: Mar 2012
Posts: 26,155
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From: Near Cal. Avenue
A HEC test of the cluster may shed a little light, U can navigate the tests to see if there is a malf there. If it passes its tests, UR to the point where/if, fuel PS is low, remove the tank and replace the pump.