I have a 1996 Ford Explorer V6 4.0 with 212,912 miles on it. It has been choking down lately and I went to AutoZone today and they read my codes for me. They gave me P1507, P1450, and P0171. What would be the best way to fix these and what exactly needs fixing? The fuel pump was replaced back in August. It couldn't be that would it?

 

I looked and couldnt find anything on the first 2 codes but the 0171 is lean bank 1, which could be many things. with that many miles you could have a leaky intake manifold maybe bad o2 sensor clogged injectors. i dont know too much about the 4.0 ohv motor, which i believe all 96 v6's were

 

Here you go i found some more info
Fuel system DTC reference list:
Bank 1 = DTCs P0171 (lean) and P0172 (rich).
Bank 2 = DTCs P0174 (lean) and P0175 (rich).
CHECK the intake air system for leaks, obstructions and damage.
Check the air cleaner for blockage.
Verify the customer did not run out of fuel.
Verify clean sufficient fuel.
Verify the integrity of the PCV system.
CHECK for disconnected spark plug wires.
Check for vacuum leaks.

 

Look here for the codes references you are missing

http://rockledge.home.comcast.net/Ra...llery/DTCs.pdf

 

Based on your information, I went back to the IAC valve. It passed all electrical tests and I had cleaned the valve and the passages. I tried disconnecting the IAC valve to see the response and nothing happened. I then loosened the mounts and the idle speed picked up.
This convinced me to go ahead and replace the IAC valve. Runs like a champ now!