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wrench buster

Thanks for your info. This truck has lots of pressure to the EGR tube at Idle. I've had other trucks with the same engine running and not as much pressure at the crossover pipe. Do you think I can use some of the freeze frame data to narrow the problem down? Today I am going to pull the DOC off and inspect it for plugging. The owner had the DPF cleaned however he didn't have the DOC serviced. I did a regeneration analyzer test about a week ago with INSITE and it passed. Let me know your thoughts on how to find the cause of frequent regens and blinking the regen lite.

Regards and thanks a bunch

wrench buster

(08-20-2025 )Rawze Wrote:
(08-20-2025 )wrench buster Wrote: ...
The DPF was cleaned a couple of weeks ago. It is doing re-gens about every 10 hrs. according to Insite. Thanks for your reply. Let me know what to look for in the aftertreatment history if possible.

Was the DOC unit cleaned as well?.

How was the DPF cleaned?.

Did anyone bother to do a DPF replacement procedure in Insite when the clean one was installed?.

Was the Decomp tube inspected for clogging?.
info: https://rawze.com/forums/showthread.php?...07#pid1807

You said it was a new egr cooler.. is it an OEM unit?, or after-market?.

Does the turbo calm down when the DPF, temps etc. reach above 450-f so?.

What is the turbo position and engine rpm sitting at when its acting up?.

Saw the article on Decomp. tube , Very good point a will check it out today. Thanks

wrench buster

(08-20-2025 )Rawze Wrote:
(08-20-2025 )wrench buster Wrote: ...
The DPF was cleaned a couple of weeks ago. It is doing re-gens about every 10 hrs. according to Insite. Thanks for your reply. Let me know what to look for in the aftertreatment history if possible.

Was the DOC unit cleaned as well?.

How was the DPF cleaned?.

Did anyone bother to do a DPF replacement procedure in Insite when the clean one was installed?.

Was the Decomp tube inspected for clogging?.
info: https://rawze.com/forums/showthread.php?...07#pid1807

You said it was a new egr cooler.. is it an OEM unit?, or after-market?.

Does the turbo calm down when the DPF, temps etc. reach above 450-f so?.

What is the turbo position and engine rpm sitting at when its acting up?.

Thanks for your input, I came to find out the shop had the DPF cleaned, however the DOC was not. Come to find out the guy cleaned the DOC with a steam cleaner? Not a good idea. I removed the DOC yesterday and took it to get professionally cleaned. The guy told me it gets cleaned with hi air pressure (no chemicals) . I also noticed and he did too, that the engine is running rich and lots of soot on the inlet side of DPF. He said possible face plugging going on. There is a diffuser on the inlet side so I really could not see the actual DOC face material. I believe I am getting close to finding the cause of frequent regens and regen blinking lites. I now have a CAC coller test unit and going on the theory of over-fueling, lack of air causing excessive soot in the aftertreatment system. Let me know your thoughts and thanks again for your advice and I also am going to check the SCR diffuser for blockage.

wrench buster

(08-19-2025 )tree98 Wrote: The ECM commands all kinds of different pressure through the EGR circuit to the intake. You have no way of knowing how much is to much at any given time. I think your chasing your tale and following a rabbit hole with no end.

You said you have a code for high DPF differential pressure so start there. When is the last time the DPF was baked? What does aftertreatment history look like when connected with insite?

Thanks for your input Tree, come to find out the DOC was Not cleaned, and there are signs of excessive soot entering it. I believe I'm getting close to the root problem. Excessive fuel and or inadequate air entering the engine.

Rawze

(Yesterday )wrench buster Wrote: Thanks for your input, I came to find out the shop had the DPF cleaned, however the DOC was not. Come to find out the guy cleaned the DOC with a steam cleaner? Not a good idea.
...

If they used a liquid process to clean the units, it cuts their lifespan in half or less, and you have noting but issues after that. - ANY liquids washes out the precious metals, and then its problem city with them.

some older posts that talk more about this...
ref: https://rawze.com/forums/showthread.php?...3#pid73753
and...
ref: https://rawze.com/forums/showthread.php?...6#pid68776

wrench buster

(Yesterday )Rawze Wrote:
(Yesterday )wrench buster Wrote: Thanks for your input, I came to find out the shop had the DPF cleaned, however the DOC was not. Come to find out the guy cleaned the DOC with a steam cleaner? Not a good idea.
...

If they used a liquid process to clean the units, it cuts their lifespan in half or less, and you have noting but issues after that. - ANY liquids washes out the precious metals, and then its problem city with them.

some older posts that talk more about this...
ref: https://rawze.com/forums/showthread.php?...3#pid73753
and...

Thanks Rawze, This is a learning process for me and I love it, I enjoy the challenge of figuring out things and getting them to operate AS designed. I am finding out these engines run on a FINE LINE and if one thing is out of specs, look out. I am hoping to wrap this project up this weekend.

ref: https://rawze.com/forums/showthread.php?...6#pid68776