Question about 2002 Ford F-150 - XLT, 6 6" short bed, standard box - ProCap Bed Caps

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2002 F150 XLT 5.4 L. Throwing PO174 codes. Was throwing PO174 & PO171 but changed the fuel filter and cleaned MAF. Now threw a PO174 after 60+ miles of driving. Has a rough idle that runs 1200 rpm them drops 4-500 then will increase back to 1200. No vacuum leaks PCV hose is good. Any solutions?

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Ford has bad rubber and plastic hose leak.

Here is an example on the PCV connection.
You has to check all plastic connector for cracks

Posted on Jan 17, 2014

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Most of the time a P0171 and P0174 is caused by either a vacuum leak--more than likely the PCV hose and valve or a dirty or defective Mass Airflow (MAF)sensor. Low fuel pressure can also cause this condition. The PCV hose is located on bank one but can affect both sides because the other end is located on the back of the upper intake manifold. Usually they deteriorate and get a hole in it.

Clean the the MAF sensor with MAF cleaner, which you can pick up at any Auto parts store and also pick up a bottle of fuel injector cleaner. Good luck and hope this helps.

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This is an indication that the PCV Elbow Hose is cracked or eroded. Also check the fuel filter.
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Thank you Sir, Have a nice day.

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your computer is reporting bank 1 and 2 too lean, usually caused by the mass air flow (MAF) sensor, you can usually clean this sensor and reset the light. Clean it with electric cleaner or brake cleaner, make sure it is dry before reinstalling, also take care not to damage it. Hope this helps, let me know

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