Hi Everyone.

My 04 Explorer 4.0 has been giving me the bank 1&2 lean codes. It is the fully electronic throttle body not mechanical. It seems from reading that in 04 is when they switched to the electronic version. Here are some things I have done to resolve this. I created a diy smoke machine from a paint can and air. I found a leak by the egr. I replaced the egr and gaskets, along with the metal part that goes into the throttle body. I replaced the pcv and hose(although it looked fine). I replaced my intake gaskets. I replaced the MAF sensor.

Before all of this my lt fuel trims were +25 for both bank 1 & 2. After doing all of this my trims did come down a little to Bank 1 +16 and bank 2 +23. I dont know what to check next! If you have any ideas I would really appreciate it.

 

Since your able to read the long term fuel trims, I assume you can also monitor the oxygen sensor operation. How are the oxygen sensor readings? Do they seem to be responding like they should or are they always reading a lean condition?

-Rod

 

I forgot to mention I also replaced both upstream sensors. With Bosch not oem. If I remember I remember correctly the readings for bank 1 and 2 would fluctuate between .2 and .8. I will have to double check that though by purposely inducing a rich condition.

 

How does your fuel pressure look?

 

The reading on my code reader was around 39.5. I cant find a schrader valve and I think ford deleted it in 04. Otherwise I would hook a gauge up 2 it.