3406E power problem

You need to hook up a laptop with CAT ET, go to the Status Sections to see if the Throttle Position Sensor is showing 100% throttle application when you mash it to the floor while driving. The fact the engine runs fine for a few seconds after taking your foot off the throttle after a short stop, makes me wonder.

The TPS can act up and be within its range and not throw a fault code , but cause low power issues.

 

Sounds like a bad fuel line or fitting if you are getting air at the primary filter.
What kind of fuel line are they?
I have been tolled that if you turn the key on and press the throttle pedal all the way down and let it back up then key off that it resets the pedal to the ECM.

 

You have a leaking charge air cooler, I have 15psi of boost just running down the highwy at 1350rpm's and when I am in a hard pull up too 34psi. I also have a 5EK. replace your charge air cooler you will not be sorry.

 

Pressure check the aftercooler before you replace it

 

mr haney, i need to get your contact info ,i need to ask couple of questions about upgrading the ecm on my truck thank u

 

have you found your problem mine is doing the same

 

The correct term is Air to Air aftercooler ATAAC. 99% of the ATAAC's tend to crack on the side rails or in the back. Yes, fuel pressure is low. It should be 80-85 psi at idle and no lower under load. The older pumps did wear out, or had shaft seal leakage issues.

 

i have changed fuel filters injectors and just put on new pump but it still runs sluggish like a filter is blocked mine is a 2ws 475 in a w900 by the way seems like i am dealing with the same problem you had