2003 F150 XLT 5.4 Code Help

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Apr 5, 2021 | 09:25 PM

jesse121pm

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Joined: Apr 2021

Posts: 1

2003 F150 XLT 5.4 Code Help

I have code p0171 and p0174 and they are for it running too lean. I heard that it could be the pvc hose. I replaced the pcv valve and added Lucas fuel injector cleaner. Nothing has fixed it so far. What is the most common fix?

Apr 6, 2021 | 08:23 AM

hanky

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Joined: Jun 2010

Posts: 16,662

One common problem was cracked plastic intake manifolds allowing vacuum leaks.

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