Well second one in less than a week,was called to one of my customers today for a code E-38,truck would start and run good and has throttle response for a couple minutes then nothing,regualtor is fine PSI is good at 4.5-5 PSI,getting another injector in the AM and going to this customer and install,is on a diffrent model Nissan(MU1F2A25LV) but same engine.
When it starts loosing throttle resonse if you shut the truck off it will start right back up and have response again for a couple minutes then looses it again.
Checked the "last chance" screen,on the newer trucks is just under the vapor inlet tube to the mixer,looks the same as the older style that sat on top of the mixer underneath the small cover held on with two screws,it even has the same clip holding the screen in place,i checked this and was clean and clear.
kevin,
yes i have seen this same issue on trucks with this system on it. They had issues with the injector like this... we tried cleaning them but usually we wound up replacing the injector because of comtamination. One other thing that came to mind was inside the injector body underneath the pressure sensor some of them had a thin mesh filter screen that could get clogged up as well, we were instructed to replace that as well. If yours has one i'd replace that too next chance you get if yours has they type of sensor on it.
Update: Changed out the injector this morning and it cured my problem,runs good and has throttle response now.
Have you used the dash dislpay to monitor fuel pressure to see if your ecm is seeing what your pressure guage is seeing? If not check the wires around the fuel pressure sensor.