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Old 09-29-2013, 21:47   #1 (permalink)
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03 navigator p0171 code only

Hi guys I'm having a problem with my 03 navigator. I've search the form and I can't seem to come up with a solution. First off I have the p0171 code only meaning bank 1 too lean. It doesn't have the p0174 with it. It has a small but noticeable idle that I don't light plus the check engine light which I hate. I've cleaned the mass air flow sensor, replaced intake gasket, checked fuel pressure between 40 and 45 psi. Swapped 02 sensors around and same code comes up. Checked compression all cylinders and they were all 110 to 120. I'm stumped.. No noticeable vacuum leaks now but there was one on top of the intake in the very back around the black thing which I think is called a intake vacuum sensor. Not sure but I put gasket sealer around and sealed it but I believe I still may have a small leak because my air will only blow thru the defrost unless I'm coasting. But if I'm accelerating it's coming thru the defrost. Could it be related to my problem? Anyone with any ideas? Sorry for the long post but wanted to get all the info I had to narrow down the problem
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Old 09-30-2013, 09:53   #2 (permalink)
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Re: 03 navigator p0171 code only

I'd see about the vacuum leak for the heater system, That may be the whole problem.
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Old 09-30-2013, 14:09   #3 (permalink)
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Re: 03 navigator p0171 code only

Thanks Bert but I redid the compression test and for some reason I didn't get accurate results the first time around.. Now all cylinders on bank 1 are around 150 psi but cylinder 2 is at 110 psi.. Poured a little marvel mystery oil in the cylinder hole and retested it time after time and it reading no lower than 125 psi. So imma run the rest thru the gas and see how it performs before I do a head job. Will update soon
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Old 09-30-2013, 16:52   #4 (permalink)
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Re: 03 navigator p0171 code only

I would look a little more for any sort of unmetered air. Other than that will need to know when it shows lean. If its at idle it is most likely an air leak


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Old 09-30-2013, 17:45   #5 (permalink)
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Re: 03 navigator p0171 code only

It actually runs well at idle in park but in drive or reverse is when the truck starts to shake.
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Old 09-30-2013, 19:25   #6 (permalink)
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Re: 03 navigator p0171 code only

Since it's only one bank, it's more likely the lower intake manifold. I have the same problem and it's costing me around $20 through Rock Auto... including injector O-rings. I'm reasonably sure that's my source.
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Old 09-30-2013, 22:35   #7 (permalink)
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Re: 03 navigator p0171 code only

Quote:
Originally Posted by Texas_finest1 View Post
It actually runs well at idle in park but in drive or reverse is when the truck starts to shake.
But you need to know what the computer sees. It can compensate to cover a problem. Even tho it seems to run good a t idle and roughing drive or reverse could still be vacuum. A scan tool that gives more info would really help


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Old 10-01-2013, 12:50   #8 (permalink)
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Re: 03 navigator p0171 code only

Took it in to get it scanned and sure enough my extra reliable mechanic said it would need a head. Too bad for me I just did the driver side head a couple weeks ago. Thought the passenger head was good but I guess not. Could have done both at the same time. Smh but I'm saving a lot of cash doing it myself.. Only cost 250 to have the head redid plus heatbolts and head gasket plus the time it takes to do it on my own. Let you guys know when I'm done. May be a week or so because I probably can't start on it till the weekend
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Old 10-01-2013, 16:43   #9 (permalink)
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Re: 03 navigator p0171 code only

Why does it need the head done? I've never done head work for lean codes.


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Old 10-01-2013, 18:24   #10 (permalink)
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Re: 03 navigator p0171 code only

Low compression cylinder 2
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