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2000 F150 5.4 P0174 and P0171

Old 01-16-2017, 11:03 PM
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Default 2000 F150 5.4 P0174 and P0171

I have codes P0174 and P0171. it runs rough. Kind of feels like its missing. I had a new fuel pump and fuel filter put in but that didn't fix anything. There is no check engine light. I have tried cleaning the MAF sensor multiple times and still nothing. Any idea what could be wrong?
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Old 01-16-2017, 11:52 PM
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You are more than likely looking at a vacuum leak. Check the elbow behind the intake on the hose running from the pcv valve on your passenger side valve cover.

That would be the easy possibility, the harder one would be that your intake manifold has cracked or your manifold gaskets have deteriorated.
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