Exhaust trap inlet pressure

If you seek info on this blog is because you work on your own truck... if you go to to dealershipsto have your truck worked on quit what you are doin and go drive for sombody..

 

Okay then, Remove the DOC/DPF and send it to a shop to be cleaned. Then perform a snap throttle test and test the fuel doser.

Is that better?

 

I guess i should have started with step 1.. remove dpf , inspect if you cant see through it its freakin done... its life span is shot... as for the catalyst blow compressed air through it .. if it doesnt make it through its also shot... ive seen alot of scr catalyst go bad after 250 thousand miles... theres is soot cummin out of these engines because of the back pressure... if youre money is funny like mine you can save some by doin this... procedure...

 

That's incorrect.

A visual inspection does not tell you if a DPF is good or not. In fact, if you cannot see through the DPF then the DPF is doing it's job and needs to be cleaned outside of the chassis.

Are you talking about the Diesel oxidation catalyst or the SCR? Because an SCR will not cause a DPF inlet pressure fault. A DOC can, however a plugged DOC is not the cause of a DPF inlet pressure fault. The DOC has a coating on the substrate that causes a chemical reaction with the fuel that is injected into the exhaust. This causes the fuel to burn in the DOC. If the coating is worn off, the fuel will not burn until it reaches the DPF and then you've got issues.

There should not be excessive soot output from the base engine. No matter what.

 

Fyi... look at the inside of a brand new dpf also look at a used dpf that has been cleaned and youll see wat im talkin about... the catalyst after the dpf is wat i was talkin about...

 

I know exactly what you're talking about. I make my living fixing these crappy aftertreatment systems.

Truckers hate them, I love them.

 

Hats off to ya brother... here i thought i was talkin to another driver... i myself have been around trucks and worked on em all my life ... its been my experience that cleaning of the dpfs has been money in the trash can... soot coming out of these engines has always been a mystery there are many variables...

 

Excessive soot (partially burned fuel) output is caused by too much fuel for the amount of air in the combustion chamber or the inability to ignite the fuel (lack of heat, caused by lack of compression). So, either a turbo is not building enough boost (caused by a bad air filter, Clogged CAC, turbo, or VGT actuator), an injector is over fueling, a cylinder with low compression, or of course an EGR issue.

There are variables but they can be diagnosed and fixed.

We've got 180+ tractors, every single one has a DPF. If maintained properly, they rarely have issues that are more than sensor failures.

P.S. don't take your hat off to me. Neither of us would have a job if it wasn't for the other person. I don't want to do your job, to be honest. I'd rather fix em than operate em.

 

Ive had my egr scr cummins well over 5 years now ive cleaned and maintained it myself close to 500 on the odometer the only problem ive encountered was it gets freakin expensive... this lil stunt i did on the dpf and the catalyst has been workin for me well for me well over 150 thousand miles everything on it is functional it regens normally power has been consistent... and best of all no derates...