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Old 11-14-2010, 09:06 PM
dreyko dreyko is offline
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2006 5.4l expedition engine serioously lacks power codes p0171 and p0175

p0171 and p0175
bank 1 too lean and bank 2 too rich
these codes dont make sence to me, this vehicle has a commonrail fuel system and a connected intake.

the engine lacks power so much so that it is undrivable. it hesitates and stumbles, it has yet to stall but acts like it wants to.

I have checked the maf and it is working properly.
I have removed both cats and saw no change.
I have tested vacuum and am seeing 15hg steady.
I have pressure tested the cooling system and am losing no coolant.
I have seen no smoke with the cats removed so I am doubtful of bad rings or head gaskets.
The engine idles steady, it almost feels like a terrible misfire but the lack of misfire codes leads me to think otherwise.
It will routinely act as if I am not applying throttle when I am.

I need to know how much vacuum this engine should generate at idle,
what numbers should a working tps read?
How dangerous is spark plug removal on this engine?

Any thoughts suggestions or ideas?
thank you,
Benjamin
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Old 11-14-2010, 10:34 PM
alloro alloro is offline
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Vacuum should be right around 20 Hg.
Did you test the fuel pressure, if so, what was the PSI?
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Old 11-14-2010, 10:51 PM
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Beins this is a 3 valve engine, spark removal can be a pain, but i can give u some tricks that will help if u r interested. Is p0171 and 175 the only codes? I dont believe i have ever seen this problem. a rich and lean code set at the same time for the same bank. that is odd...i wouldnt think it would be fuel supply related beins its on 1 bank instead of both. But i could see fuel delivery to cause this issue. I have seen alot of trouble with injectors in this engine, but u normally have a missfire code such as p03xx depending on which cylinder is missing. I would recommend pulling the fuel rail up out of the intake. Leave the fuel lines connected to the rail and have some one turn the key on while u watch the injectors. There should not be any fuel to come out of the injectors with KOEO. If an injector does leak fuel replace it....
I have seen the electronic throttle bodies due some weird things as well, but they normally set dtc's as well/
I would also recommend watching the o2's and see what they r doing. R they running rich and then lean on bank1? What is really happening? U could have a PCM issue as well... Hope this helps
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Old 11-14-2010, 11:49 PM
dreyko dreyko is offline
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its not on the same bank its on 2 seperate banks.
p0171- bank 1 too lean
p0175- bank 2 too rich

I have not tested fuel pressure, I will tomorrow what numbers am i looking for?

I have heard that faulty tps's can cause odd sympoms on these vehicles, could that be a suspect?

And as for the spark plugs Im more referring to the likelyhood of stripping threads/ breaking plugs. Ive heard that the issue was addressed by the 2006 model year but I would like confirmation.

Thanks Guys
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Old 11-15-2010, 08:47 AM
alloro alloro is offline
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Quote:
Originally Posted by FordMstrTech View Post
that is odd...i wouldn't think it would be fuel supply related being its on 1 bank instead of both. But i could see fuel delivery to cause this issue.
I thought only politicians give two completely opposite answers to the same question.
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Old 11-15-2010, 10:48 AM
soundtransmission soundtransmission is offline
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Quote:
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And as for the spark plugs Im more referring to the likelyhood of stripping threads/ breaking plugs. Ive heard that the issue was addressed by the 2006 model year but I would like confirmation.

Thanks Guys

Noooooooo ... unfortunately, 2007 was the year it was finally addressed.
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Old 11-15-2010, 03:02 PM
dreyko dreyko is offline
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Ok fuel pressure is around 50 primed and 45 at idle.
Did a fuel seperation test, no water in fuel.

still stumped....
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Old 11-15-2010, 03:06 PM
alloro alloro is offline
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How about the problematic PCV hose elbow at the rear of the intake? Have you inspected that for clogs, cracks, or breaks?
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Old 11-15-2010, 06:12 PM
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Quote:
Originally Posted by dreyko View Post
its not on the same bank its on 2 seperate banks.
p0171- bank 1 too lean
p0175- bank 2 too rich

I have not tested fuel pressure, I will tomorrow what numbers am i looking for?

I have heard that faulty tps's can cause odd sympoms on these vehicles, could that be a suspect?

And as for the spark plugs Im more referring to the likelyhood of stripping threads/ breaking plugs. Ive heard that the issue was addressed by the 2006 model year but I would like confirmation.

Thanks Guys
OOPS my bad. Brain fart. mk lean on bank 1 rich on bank 2 my bad. Thank you for correcting me...
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Old 11-15-2010, 06:25 PM
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Quote:
Originally Posted by alloro View Post
I thought only politicians give two completely opposite answers to the same question.
Fuel supply and fuel delivery are 2 separate systems, if thats what ur fussin bout.

Fuel supply= fuel pump, fuel filter, FPDM, Inertia switch
Fuel delivery= fuel injector, fuel injector o rings, fuel rail

If u were runnin rich on both banks instead of one then probably fuel supply system.
If u were runnin rich on one bank then probably fuel delivery system...
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Old 11-15-2010, 06:25 PM
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2004, 2006, 46, 54, code, codes, engine, expedition, ford, generates, p0171, p0175, rich, running, vaccum

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