P0171 & P0174 codes.

[reed2nv]

I need help with a 97 Explorer 4.0L sohc. I am getting codes P0171 and P0174, lean fuel both banks. I have checked the MAF, replaced all intake gaskets. and checked fuel pressure. My reader shows no O2 sensor voltage (0.000) for all for sensors in the live mode. What could cause this? I assume the reader and pcm should be showing voltages for the sensors. I did a bench test on three of the sensors with a propane tourch and all are within range (0 to .9). I check continuity of the wires from two of the sensor plugs back to the pcm. I would also like to know if anyone has installed the Dorman brand (available through Autozone) lower intake manifold and if it is better than the OEM Ford manifold.

Thanks
reed2nv

 

[BrooklynBay]

Welcome to this forum! I've renamed your thread, and moved it into the EEC-V section.