Sorry the gremlin came backHope they sort it out for you @ dealer quickly. My luck with intermittent stuff like that is that it runs 100% perfect at the shop or the tech is here for service call, then back to being boogered shortly thereafter.
Not a big deal, but you might want to leave the loader at home to trailer it. Gives you a few more options for the trailer. Just the tractor, loader, & loaded rears - nothing else - is overweight on my 2x 3500lbs axles utility trailer. I'm fortunate to have a friend close by with a better equipment trailer that he lets me borrow. Even at that, my F150 EcoBoost with tow package dislikes it. Does it, just can't get it parked on trailer to ride well. I'm usually only trailering 10-15 min so no big deal, but if it's a longer ride might be well worth leaving the loader behind.
Just curious.....you said ...at 1600 rpm. Do you typically run that low? Just wondering since I've read here that tier4 engines need to be run at high rpm all the time. I do same and try to be at min rpm to do the work just to cut down on noise, but generally stay at least 2000+ because my ignorance of the DPF filter and that system as a whole has me scared of breaking it prematurely from running at lower rpm. I *think* the low rpm leads to more frequent regen cycles which leads to shorter DPF filter service life. But no idea if there is other harm caused by running at lower rpm as the norm
I run around 1600 when I am just travelling around, not working the tractor. I crank it up over 2000 when putting a load on it and run at PTO speed when using any attachment off the PTO. The dealer I bought this from loaded the trailer with the tractor bucket facing the rear. He pulled forward on the trailer just until the back of my Ram 2500 started to drop a little bit. He then said "tie her down good".
Tier 4 final tractors do want higher RPMs to run all the time, is what my dealer told me when we were discussing the issues with all the emissions stuff. You might want to bump it up closer to 2K all the time- it won't hurt it, but it could keep it from acting up and causing you problems.
Basically to burn clean you have to burn more fuel. That's the crazy way the new ones are designed. Can't have particulate pollution, and we must be good Americans and find then burn more oil! Trump wants to open up Alaska to drill, baby drill! YIKES!
Good luck.
I pulled both 02 sensors today and they are clean as could be. I have a friend lending me his trailer this weekend to drop it off. My tractor does not smoke at all and is never lugged under a heavy load. The exhaust never stinks on it. I did check the terminals again on the ECM. They are clean and watertight. Whatever is going on, I believe that it is electrical.
I wouldn't expect the O2 sensors to be fouled, nor for the tractor to smoke, or for there to be any odor from the exhaust. I tend to agree with you, that the cause is more likely a electrical issue, of an intermittent type controlled/read by the ECM and possibly related to a temp sensor or similar item that may trigger the ECM to function as it appears to do currently, and when it is not fixing itself. Though it may have had a flash upgrade, it may not have taken. You know, bought with ver 1.0, updated to 2.0, now may need 3.0 or higher tweak to get it right.
All this stuff is new to diesel tractors for the most part. Similar to cars from the early 70's where there was a LOT of tweaking to anti pollution devices. Remember air pumps- just about every car with one ended up with it's belt removed....
Cross fingers....
Since you have to drag it 1200! miles, one way, is there no MA dealer you could work with in your area? It seems absurd to have to go that distance for a problem that could, unfortunately, (take a few dealer trips before being fixed permanently?) I'd check with your selling dealer and maybe Kioti corporate before hauling and see if they can work out a satisfactory situation. It's probably a parts swapping deal at this point; not like having to split it to replace a leaking HST or a real time consuming operation. And any dealer can read a code machine and swap in a known good part...