171 Code bank 1 too lean, 03 4.6 EB 2WD

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FamilyFordforfour

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I am loosing my mind on this vehicle I have changed a lot of parts: intake gaskets, MAF sensor, and the big one Injectors.
I have tested multiple ways from smoking it out, brake cleaner, propane, to soap and water with a pressurized system.
I have checked my o2 sensors, voltage is normal. I moved the injectors from one side to the other and I saw a slight change on my o2 sensors so I change the injectors. I checked all the lines before going crazy inside the engine bay. I checked the head unit for my vent system for the climate control.
The only thing I can think of now is something related to changing my timing cover. I know I had a code before changing the cover but can't remember if it was the lean code.

The only thing left is the ecu, and maybe somewhere behind the dash.
 

riphip

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Vacuum leaks in hoses, elbows or PCV. Find the problem first THEN replace known bad parts. Get a smoke tester to make it so much easier.
 
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Hamfisted

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