Ok guys I have a 2000 f250 5.4 2v triton long story short I bought this truck thinking it would be a quick fix but I'm finding out otherwise using a snap on scanner the monitoring shows the pcm making the right bank run -25 and the left bank 20 I have replaced all plugs with motorcraft and gapped to .56 it has new COPS and I also pulled the injectors to check to see if they were stuck open they weren't I've fixed intake leaks and vacuum leaks I have 35 psi fuel pressure it has a new crank sensor and cam sensor I've cleaned the IAC and the throttle body and the MAF sensor the engine is literally running on 4 cylinders I can unplug the injectors on the right bank and perform a KOER test and it shows righ bank running rich I tested the O2 sensors and they were faulty but with new bosch sensors i have no change in result the only thing left is the knock sensor or the PCM I have no pending codes and the only memory codes were #4 cylinder misfire I need some help I'm a heavy equipment mechanic not auto lol

 

Please reread your post and correct accordingly. Once you check it you should find what I believe is an error. Thanks

 

I don't understand

 

I apologize for the error maybe now it makes more sense

 

What are the readings for the oxygen sensors?
If someone else worked on the vehicle earlier could they have switched the sensor plugs? A little more investigating as to just what the PCM is seeing/receiving may shed some light on just what is going on. Can you post some of the data?

 

They bounce around a lot but both the left and right are between 800-900 always together in numbers on the scanner I'll post more accurate readings tomorrow

 

You might try creating a big vacuum leak and see if the sensors respond.

 

Ok I apologize for the delay in the response it's been a hectic week. Ok I tried creating a vacuum leak and the PCM did change the fuel but the engine of course run a lot worse as a theory I borrowed a compression gauge and tested all the cylinders even though I have no black smoke and no blow by i come up with #1-115 psi #2- 120 psi #3-120 psi #4-110 psi #5-145psi #6-210 psi #7-205 psi #8-215 psi , what would cause 1-4 to be so weak in compression maybe a jumped timing chain that jumped 1 tooth causing this problem? again I have no codes