2 weak cylinders?

OK, little update. The cat dealer found #1 injector was failing. Now I have not driven the truck yet to see if its any better, however they also ran an actuator test and 4 of the 6 are doing nothing. I had them trying to fix this problem last year, they changed solonoids, and even put on all new complete housings making no difference. They tried new iva pressure sensor, checked pressure at iva rail, new oil check valve, and even flashed a new ecm to try. Nothing made the injectors work. They are completely stumped. Any ideas what would cause this? Should I just put a tune in it to delete the iva since only 2 are working anyways and maybe get the engine running smooth again?

 

The cat shop was actually very good about everything, all parts they put on that made no difference they took off after. They made a t fitting to check pressure at iva rail and said it was good so cant imagine oil being plugged. Overhead was set twice with no difference. They are stumped, why does it seem like my trucks are always the ones with these never before seen issues. While running the actuator test each one tries to work then its like it just completely shuts off.

 

The only reason id even consider deleting them is because 4 of the 6 arent working anyways. People tried forever to de activate the iva without throwing a code and i cant get mine to work or throw a code lol.

 

A reman housing was put on and didnt change, so they tried another reman to make sure it wasnt a faulty unit out of the box. Work order also says inspected for oil leaks and none found.

 

My trucks seemed to run better as a 475 hp then when it was uprated to 550. Should I go back to an old flash file? Do you know if some files were supposed to be better then others?

 

Well got the truck back, with a new injector on #1. I would say ran noticably better, when I got I hooked up to the ecm and saw that the FLS was -9 and FTS was 8. The sticker on the side of engine shows FLS -8 and FTS -14. I called the cat dealer and said the ecm numbers should match the sticker regardless of what hp rating it is set at. Now I know someone messed with this ecm cuz it had a 625 tune at one point they prob fudged with those numbers at the same time. I have the 550 heavy haul tune in should those numbers be set back to what the sticker says? Possible having them wrong is causing rougher running?

 

Should note I have never been able to pull more then 40 psi boost empty and was able to produce 50 psi empty after picking it up.