2012 MP8 Cycling Regen

[Goddy454]

here is the pic when the injector is activated to heat up the DPF, injector switched back and forth between 0 and 7% duty cycle

[Goddy454]

in this pic the injector is dosing and dpf is heating up, about 5-10 mins into regen

[Goddy454]

here is when the regen kicks out at about 10 mins in, DRV closes

[Goddy454]

here is the pic of the regen kicked out, i see in previous pic DRV is still activated, might have posted wrong pic

[Goddy454]

this pic is when the regen restarts itself

[Goddy454]

here is a pic of the temp graph

[Goddy454]

regen has completed and the soot level has not changed, I even exited and re-entered the test to see if value had reset itself, which it did not

[Goddy454]

I do see a change in the differential pressure but why not in the soot ratio? there is only a 1% change there. I am trying a crystal sublimation to see if the same situation occurs.

[Goddy454]

A crystal sublimation is doing the same thing as the regen.

[Onyx610]

Are you able to reset the soot ratio 

[Onyx610]

@Mackpro @Vmac3

[Onyx610]

I’m not gonna suggest anything extensive before these two read over the info. You have done a great job with your report. 

[Goddy454]

I can do a soot level reset, have done it before but only lasts for a day or 2 till it climbs back up.

[steeler]

That outlet temp looks suspicious to me. Usually, not always, but usually when I see that the outlet temp is that much higher than the inlet I find the filter is clogged. Especially if it ran for awhile with the gunked up doser. 

So, the soot level will reset for you manually? 

 

 

[Onyx610]

20 minutes ago, steeler said:

That outlet temp looks suspicious to me. Usually, not always, but usually when I see that the outlet temp is that much higher than the inlet I find the filter is clogged. Especially if it ran for awhile with the gunked up doser. 

So, the soot level will reset for you manually? 

 

 

Agreed, I think you should consider taking a look at the filter. I think you will find it face plugged. 

Edited June 6, 2023 by Onyx610
Spelling

[Goddy454]

I will drop the filters and check them out anyhow but wouldn"t the truck lack power from the excessive back pressure if that was the case? And yes I have had no problem resetting the soot ratio.

[steeler]

1 hour ago, Goddy454 said:

I will drop the filters and check them out anyhow but wouldn"t the truck lack power from the excessive back pressure if that was the case? And yes I have had no problem resetting the soot ratio.

I've had them almost completely face plugged and run fine power wise, just won't regen properly. Sometimes when that happens, you do a regen and the outlet temp skyrockets quickly from the excess soot basically "catching fire". 

You may not actually see anything at all, but the filter could still be clogged. I'd either have it and the doc checked, or replaced. 

[Goddy454]

OK thats what I will do, and when they are down I will keep you posted. Thanks

[Onyx610]

17 minutes ago, Goddy454 said:

OK thats what I will do, and when they are down I will keep you posted. Thanks

I think that’s the best next step to take. Hopefully you find a lot of soot.

[fjh]

2 hours ago, Onyx610 said:

I think that’s the best next step to take. Hopefully you find a lot of soot.

There was an issue with the insulation coming loose in that accordion tube as well best look at that DPF as stated these guys got you covered! If you find fluff on top change out that tube as well!

[Goddy454]

ok so here is what i got, don't have a pic of inlet side of DOC because you wont see anything anyhow, but looking the the screen i can see it is face plugged

[Goddy454]

here is the outlet of DOC

[Goddy454]

here is the DPF inlet and outlet

[Goddy454]

I meant looking through the round holes in DOC inlet screen I can see its caked up really good. Only see a couple little spots where I can see the honey comb pattern.

[steeler]

That's good news. I'm sure the clogging is from the problem you already fixed. That explains the whacky temps you had.