NX4510 CEL and limp mode

[Kioti Dave]

Have 330 hours on tractor. Regens every 50 hours give or take since new. About 12 hours ago started to regen every 3 hours. 2 auto regens and 2 manual regens. At beginning of last manual regen CEL came on, regen stopped and went into limp. Searching other threads leads me to believe a bad injector?? Other ideas as to cause? Will be contacting dealer in am.

 

[rademamj1]

KiotiDave, your probably right about the injector. It appears to be the most common cause of an over rich diesel fuel mixture, leading to short regen cycles and eventually a plugged DPF and that causes the CEL coming on. Only a dealer can handle the emissions issues related to bad injectors, and diagnose which injector is defective from running tests. Sorry it happened to your tractor.

 

[todd92]

Not all dealers are going to be competent diagnosing and fixing this.

 

[Kioti Dave]

Dealer came to look at tractor. They are 1 hour away, and came by lunch the day I called. Hooked up laptop and the codes that came up all pointed to DPF. They went through a checklist to ensure everything was functioning. No obvious culprits. Informed them of issues that other owners had like bad injectors. Had a really hard time getting it to regen manually. Finally 3 hours later and one successful regen, they said to give it a try. If it doesn't work, next step is to replace DPF canister. Sure enough, 0.8 hours later, tractor calls for manual regen. Did not go into limp mode, so will go out again to see what happens. Miss the days of pregnancy emissions.

 

[Kioti Dave]

Dealer came to look at tractor. They are 1 hour away, and came by lunch the day I called. Hooked up laptop and the codes that came up all pointed to DPF. They went through a checklist to ensure everything was functioning. No obvious culprits. Informed them of issues that other owners had like bad injectors. Had a really hard time getting it to regen manually. Finally 3 hours later and one successful regen, they said to give it a try. If it doesn't work, next step is to replace DPF canister. Sure enough, 0.8 hours later, tractor calls for manual regen. Did not go into limp mode, so will go out again to see what happens. Miss the days of pregnancy emissions.

PRE emissions

 

[justman777]

PRE emissions����

Oh, the times and fun we can have with that statement...:laughing:

 

[Kioti Dave]

New update. Dealer came back today and we found oil in hose going from turbo to intake. So turbo seal leaking. Did injector test and the values on each injector not even close. So it seems I have both problems that others have found on this forum. They will forward photos and the numbers to Kioti and wait for parts. Dealer has been very responsive. They have come to my place twice in the last 3 days (1 hour away) and will pick up tractor when parts are in. Dealer does make a big difference

 

[justman777]

I think with all the issues we've resolved on this forum, we could start our own database of issues and be one-up on Kioti technicians. So now we know if we're having issues to pull the hose going form the turbo to the intake to see if it has an excessive amount of oil in it. And knowing is half the battle!

 

[rademamj1]

Amazing that all three injectors were running a rich fuel mixture. That most likely accounts for your emmissions system short regen cycles and DPF plugging, and also probably explains the oil in your Turbo. Its really unburned diesel condensing in your Turbo exhaust system, another indication of rich fuel mixture.

 

[Kioti Dave]

Amazing that all three injectors were running a rich fuel mixture. That most likely accounts for your emmissions system short regen cycles and DPF plugging, and also probably explains the oil in your Turbo. Its really unburned diesel condensing in your Turbo exhaust system, another indication of rich fuel mixture.

My thoughts also. Unfortunately, Kioti software does not give technicians the range it is supposed to be in?? They tested a new machine off the lot before they came to my place. All 3 injectors on the new engine gave a value of about 14.5. Mine were 8, 10 and 12.5. I think these were shutdown values. Am waiting to hear what Kioti will replace.

 

[rademamj1]

My thoughts also. Unfortunately, Kioti software does not give technicians the range it is supposed to be in?? They tested a new machine off the lot before they came to my place. All 3 injectors on the new engine gave a value of about 14.5. Mine were 8, 10 and 12.5. I think these were shutdown values. Am waiting to hear what Kioti will replace.

I remember hearing a range of 12 to 17 is acceptable for most diesel fuel injectors, with the factory preset at 14.5 ohms. Definitely two injectors are showing bad, with a 3rd injector trending bad. You have a good Kioti dealer, trained, caring and motivated to customer support. Best of success in resolving the problem.

 

[Kioti Dave]

So dealer called and said injector #1 will be replaced. Now waiting for parts.

 

[justman777]

Seems like a lot of driving to test if a single injector would solve an issue. But hey....so long as it's their money and not yours.

 

[Kioti Dave]

Seems like a lot of driving to test if a single injector would solve an issue. But hey....so long as it's their money and not yours.

Yes. Very thankful for warranty. Hope I can resolve all issues before it expires. Sometimes wish I had bought a low hour pre tier IV used unit.

 

[JoelD]

Agree on the pre-emissions machines Dave. One big reason (and of course money) why I’m happy to keep my 2004 machine.

 

[Kioti Dave]

Agree on the pre-emissions machines Dave. One big reason (and of course money) why I知 happy to keep my 2004 machine.

Yes, working on the old 2003 Kubota B7800 was a breeze! Still have 3.5 years emissions warranty. If these problems persist, may have to look for an older machine.

 

[rademamj1]

I just realized that every single tractor 25.5hp and above, sold in the USA is required by the EPA to have a manufacturer emissions warranty of 5 years or 3000 hours on the tractor. The emissions warranty must be fully honored by each manufacturer, as required by law, except in cases of altered emissions or owner negligence.

All along I thought each manufacturer was just trying to be nice to its customers with these long Warranty periods on emissions.

 

[Kioti Dave]

I just realized that every single tractor 25.5hp and above, sold in the USA is required by the EPA to have a manufacturer emissions warranty of 5 years or 3000 hours on the tractor. The emissions warranty must be fully honored by each manufacturer, as required by law, except in cases of altered emissions or owner negligence.

All along I thought each manufacturer was just trying to be nice to its customers with these long Warranty periods on emissions.

Yes. Kioti has a 2 year 'bumper to bumper', 5 year emissions and 6 year powertrain warranty. One of the reasons I went new. Hopefully can work out all the bugs.

 

[Kioti Dave]

UPDATE; dealer came and replaced injector #1. Took about 4 hours. Tractor seemed to be running good, until about 5 hours in and it went into auto regen. Ran regen fine, so will have to see how long until the next regen. I think there was more than 1 bad injector. Fortunately, the dealer is great and comes to my place to fix tractor. No complaints there. Just hope we can get this sorted out soon.

 

[rademamj1]

Well that is really good news. And so your original thoughts a month ago, on it being a bad injector was correct. Let's hope to see the automatic regens continue.