High exhaust back pressure

[DannyA]

(06-27-2020 )DannyA Wrote:  

(06-26-2020 )Rawze Wrote:  pull the cans, take pics of the faces and post em here,... take em to a stealers$it and have em baked, de-ashed, and flow tested.

check the decomp tube while you are at it...
http://rawze.com/forums/showthread.php?t...07#pid1807

use a boroscope and check the face of the SCR element to see if it is face-plugged too.

=========

while it is apart, pressurize the whole engine up to about 30 psi and check for leaks via block plates on intake and exhaust of turbo + air supplied in where the turbo inlet temp sensor goes. fix any leaks found.

after that, do a turbo inspection if u suspect ur new turbo.
https://youtu.be/ZUpKb5umv_0

Also verify you put the right turbo part# on your engine. Seen where stealers$it or other shops use wrong model turbo on engine assuming they are all same because they look same. They look same on outside but there are different turbo's w different turbines for different tier engines and it can greatly effect regen problems. Register an account on quickserv.cummins.com with your esn number and look up the right part#. Compare it to part# on turbo and invoice.

Hi Rawze,
I will take the cans out for cleaning sometime next week. I know it may sound dumb but what do you mean by pressurizing the whole engine? How I will do that?
Today anew code came on. Fault code 2973. Replaced the IMAP sensor 2 miles down the road the code came back on.
I fill like I will never be able to get this truck running. Thank you for help

Finally I got the filters down for a bake and clean. I attached pictures of the filters before cleaning. I have them back together and run a aftertreatment regeneration analysis and failed. Exhaust gas pressure to high. Exhaust gass gas pressure is around 160 during the regen, intake pressure 32 and turbo runs at 75k-77k.
It pass the filter flow test.
In NoX correction is around 165 and the out 175.
Any idea on what can cause this high exhaust pressure? Is possible to have a failed SCR and is blocking the exhaust? If the SCR is bad will not show up as some kind of NOX codes?
Anyone have an ideea?