steeler

That was it. Strange that I didn't have any egr related codes, but that explains the climbing soot level. I really didn't know that egr diff pressure played that big of a role in calculating soot. Oh well thank you guys for the help as always!

Strikeout with the 7th injector. No change. But I noticed while the engine was running the egr mass flow serious occasionally jump. It didn't look right with the valve commanded at 0%. I got digging and found where somebody had spliced a new connector on the egr diff pressure sensor, I checked continuity to the ecu abs found they had 2 wires spliced backwards! I have high hopes that'll fix it.

Pm sensor they replaced at well. Pretty much everything has been replaced before it came to me. BUT I noticed last night they put the wrong 7th injector in it. Fingers crossed!

Turbo is new, they did that along with injectors and cam. Ahi has not been replaced, but it's opening and passing the test in tech tool like it should. For some reason the ecu just isn't telling it to start dosing during regen. Also I should add that the soot level will skyrocket during regen. If you call what is doing a regen... If I reset soot level, it'll go from 19% to 160 in about 30 minutes. No engine smoke, runs fine until it derate fire high soot. Filter has been pulled and replaced 3 times by customer during this diagnostic nightmare and it's clean. So, from what I'm seeing, it's not really sooting up, it just thinks it is. Dpf diff pressure looks good at.... . 12 during regen. I'm trying not to parts cannon. The customer has already launched a boat load at it with no luck lol.

7th injector is good. Swapped the acm with no change. Head scratcher!

Yeah that was my first thought. I reset everything with no luck. Swapped ecu with a different truck, still nothing. Getting ready to swap acm and try that!

2021 mp8. The truck came to us for not completing a regen. Using tech tool I start the regen but it never commands the hi to start dosing. Engine idles up, exhaust temps look good in the 550's and I can see the ahi module go thru it's checks.. Then it just sits there. Never starts dosing. Before it came to us it had new injectors, turbo, manifold, and the entire 1 box is new.. I'm getting, or maybe I already am.. Stumped!

I had a customer that had put new injectors in a epa 10 mp7, but somehow put epa 10 mp8 injectors in it. It came to me because it ran HORRIBLE! In my case the mp7 did not like mp8 injectors in it at all! I had no knowledge that they had even put new injectors in it. Chased that one for a couple days before I discovered the problem. So... They might not have been mp8 injectors, but they definitely could've been the wrong mp7 ones lol!

Agreed! That 600 is the delete kit, and the updated rail pressure sensor and rear injector harness. If the sensor and harness have already been updated, then probably way less than 600.

Yup, that's the difference between big city dealer vs mom and pop in Kentucky! 😂 At least they won't have you down for 2 weeks like some shops around here.

I guess it depends on his location. I assume big city dealerships are way more expensive than small city mom and pop shops.

Yeah I do a lot of these deletes. I'm not sure what the parts cost, but it's a really easy fix other than updating the software for the accessory kit. 3k sounds high! Edited to add... I had to check to see what we charge for the delete. About $1000. Dang maybe we are too cheap! Parts are less than 600 bucks, and the job only takes a couple hrs max.

A little late to the party but I was going to say it was the water pump. I've seen 2 so far that turned the coolant purple/black due to the fins rubbing. Surprisingly neither were leaking though. Glad you found the problem!

I ran across one like that, hollowed out, but not deleted.... Go figure lol

Same here. We have customers that run 80 90 without issues in them, but unless the customer requests otherwise, we fill all rebuilds with 50w synthetic.