how often should a forced regen be done ... I have been running this truck for two years and had to change the nox inlet sensor and after 30 miles it said I had to do a forced regen ... I have never done one till then but what I've read it could go either way ... some say once a month some say the truck will tell you 2019 Kenworth T680 Paccar MX13
The truck will regen based on it's own demands. Things like short trips and higher soot output from engine will require more frequent regens. Also you'll find that when you start needing forced regens(even with just age), they'll become more frequent due to higher ash loads in the DPF. This eventually will need to be serviced and cleaned.
it asked me to do another forced regen after a full day of running today ... I did that and then stopped for fuel and the engine light came back on with the inlet nox sensor fault again ... any ideas ... is the dpf filter clogged
Went through something similar.. Ended up getting the DPF and Dox? Cleaned at a Peterbilt dealer and everything went back to normal. I idle a lot so for me I should get my DPF cleaned periodically..maybe every 200k. Another thing I do is when it gives me a passive regen every 4 hours of idling I hit the manual regen switch. Sometimes it will put it in a full 45? minute regen..most times not. I only hit the switch if I got time to wait until it completes.
Certain engine faults can inhibit passive regeneration from occurring. Fix your check engine light and then see if the regen request is still occurring too frequently.
Much like goodsnap stated, your truck should be doing passive regens anyways. Another reason on top of codes it won't successfully do this is low DOC temps. This can be caused by a plugged DOC, exhaust leak, etc... Get your nox sensor issue diaged and fixed first.
so I took it to peterbilt and they didnt find any issues at all ... went back to running and for two days not a single issue ... day 3 in the middle of a run it said soot level high so I did a forced regen ... it took 45 min this time (past couple were 25-30 min) ...went the rest of the way to the drop and decided to hook up my OTR ... still no faults but it said the soot level was 70% ... now towards the end of that run it was in town start and stop but I would have thought after doing a regen the soot level would have been low ... driving back home I monitored the soot level ... it stayed at 70% for a while .. even dropped a couple of points to 68% ... had to stop for a phone call and let the truck run ... by the time I got back going it was at 90% but eventually after about 120 miles it finally was way down around 12% ... now I have several questions ... and I never did get a check engine light so I am thinking the nox sensor issue is fixed? 1. does this seem normal ... would city driving make the soot level jump that high 2. does the regens indicate a clogged dpf filter 3. since it did go back to around 12% did it actually clean the dpf filter out 4. is this an indication of bad fuel 5. is there an additive to help clean out the soot ... which one is best 6. should I be doing a forced regen every so often ... how often
I’d say, you’re going to continue with intermittent CEL’s, until you get the DPF cartridge cleaned (MX13 interval is 220K-250K, IIRC). If you own the truck, get the cartridge out, take it to a car wash, soak it in Gunk engine degreaser (not the foam crap, the regular stuff), then, thoroughly wash it, blasting every passageway clear. If you can’t get it completely clean, a new cartridge is ~$3K, IIRC. In addition, I’d replace the DPF sensor assembly (~$200, online). You’ve already replaced the NOX sensor, so it should be good. The DPF maintenance should get it running clean. Everybody has their opinions on additives. However, Hot Shots EDT seems to be one of the known effective additives. I’ve seen an experiment where a fleet owner dosed the fuel and left the truck idle for 8 days. Data showed the truck didn’t perform a single regen. I know a guy who sells their stuff through his diesel repair business. My buddy runs their winter treatment. YMMV.
