Dpf temps

[Soulreaver0102]

(01-07-2020 )JimT Wrote:  Just a few more thoughts based on your posts.

You mentioned smelling diesel fuel when regening. likely cause is exhaust leak between doser and dpf, which you might have fixed already.

The soot build-up on your DPF is uneven. It's possible you have liquid getting in a causing higher build-up in those spots or maybe some of the passages in the DPF are getting clogged up. When was the last time you sent it out to be cleaned and flow tested? If I removed the DPF in your situation that would have been one of my courses of action. Helps to eliminate a possible issue.

Question, have you rebuilt the fuel pump? Are you getting good fuel pressure? One of the pictures you posted of the data monitor showed a maximum measured pressure of 9172 psi. I could be wrong, but that seems low compared to the other data displayed in that picture (attached to post 2). Also, low fuel pressure could contribute to the injector performance test failure. I am by no means an expert here, just commenting on what I see in the pictures. Maybe someone else knows where the fuel pressure should be during a parked regen?

Also, check the doser for soot build-up. If the fuel pressure is too low or there's too much soot built up it might not spray properly.

Two things not mentioned are the DOC and the SCR. Have you checked these for exhaust restrictions? DOC face plugging? Build-up in the SCR decomp tube? Ash in the SCR can? These could all cause higher exhaust pressures tricking the computer in to thinking that the DPF is full.

Finally, when I monitor engine data I usually check both commanded and measured values for things like EGR valve, fuel pressure, turbo actuator. Maybe you simplified it for the picture, but it's good info to compare.

Again, I'm far from an expert here, but I've done a good share of trouble shooting along these same lines recently. Hope this helps.

Fuel pump as a whole was replace 20,000 miles or so ago. That went out on me the very first day I got the truck lol. My luck lol. Decomp was clean. I did fix most all of the exhaust leaks when I replace gaskets and clamps but still seems to have one leaking somewhere under truck. I got to climb under when it’s doing a regen to see where it’s coming from cause only does it during regen. Doc looked good. Not sure about scr. I thought about cleaning the filter but figured I’d give the gaskets a shot first cause filter was replaced before I got the truck. Not that it means diddly sh$t in the world of DPFs. No. I didn’t simplify anything for the pics. I’ll keep that in mind next time. I appreciate all the info bud. Thank you.