2006 Ford Explorer - No Power - Misfire Codes

[rabbit76]

Hi All, I have a 2006 ford Explorer V6 and it has a perplexing problem. Started it the other day and the engine ran rough and threw codes for multiple misfires and an upstream O2 sensor (stuck rich). Needless to say, I replaced the coil, wires, plugs and the bank 1 upstream O2 sensor and the truck still runs bad. It does not want to idle, it shakes at idle and the only way to keep it running is to push on the accelerator pedal. However, once you let off the throttle the truck will eventually start to shake, power down and stall. If you do start it and put it in drive, you would need to mash the accelerator to the floor to go about 5 to 10 miles per hour. If anyone has any clues or idea I am pretty stuck right now. I was thinking maybe the fuel pressure (but I did not see a way to test the pressure on the fuel rail) or maybe the fuel pressure sensor under the manifold? It will start and move, but I would say it is not really drivable. I welcome any thoughts or help.

Also, as an UPDATE. After changing the coil, wires and plugs and the O2 sensor I do not have any misfire codes. I forced the truck to drive yesterday (to try and get the truck to throw some codes) and I got P2196 and P2197. P2196 means bank 1 sensor 1 is stuck RICH. P2197 means bank 2 sensor 1 is stuck LEAN. Why would bank 1 be stuck rich and bank 2 be stuck lean? Also, I replaced the O2 sensor on bank 1 (still got the code).

Thanks!!

 

[410Fortune]

See other thread

 

[tobykent]

A large vacuum leak can cause one bank to run lean while the other appears rich due to unmetered air affecting fuel trims unevenly.