DPF Regeneration driving me crazy...

[Reddogs]

Your not doing something correct. My l3901 has 1 regen in 124 hours

I drove my JD 790 yesterday after I got my hydraulic cylinders back, and noticed something. I never take it off idle, unless I take it on the road, or need to lift a huge object. I must uncounciously be doing the same on the L3301...

 

[deserteagle71]

I never take it off idle

^ The whole problem in a nutshell.
I wouldn't even do that to my 60 year old John Deere diesel. Not good for it!

 

[Reddogs]

^ The whole problem in a nutshell.
I wouldn't even do that to my 60 year old John Deere diesel. Not good for it!

I know my Toyota Tacoma manual says not to leave on idle, but why is my question, does something melt or overheat..?

 

[ljjhouser]

Are we talking gas or diesel engines? Tacoma, I presume gas. Even gas engines do not reach expected performance at idle and probably become prone to fouled plugs if idled for extended periods regularly.

 

[jyoutz]

My diesel VW Golf regenerates, it smells like a tire fire. Honestly the first time, at a Home Depot parking lot, when it was new, I thought I had burned off the alternator belt! So, once I understood, okay, I can live with it - except that the car goes in the garage every night. I pulled in in once, smelled the tire fire, and pulled it right back out to sit in the cold overnight! I wish that the instrument panel gave me a message saying: "You really don't want the car in the garage for the next XX minutes, while it makes a stink!". Yesterday, after a day of driving, I stopped at my daughter's first... sure enough, regenerating. Have at it, you're outside anyway! A good excuse to stay for dinner, as if I needed one anyway!

My VW Passat had a light on the dash during regeneration.

 

[jyoutz]

I think thats whats happening, I am trying to drive it like my John Deere 790 with turf tires, much lighter tractor and easier to manage.

I sure liked those old 790s: steel everywhere and cast iron transmission cases and axles. I wish they still sold JDs like that.

 

[ericm979]

I know my Toyota Tacoma manual says not to leave on idle, but why is my question, does something melt or overheat..?

For a diesel it's the opposite- it stays too cold.

Diesels don't have throttles to restrict air flow. They're wide open all the time. The power is varied by changing the amount of fuel only. This means that diesels are cold when they are idling. That's probably not good for a non DPF engine but it's really bad for the DPF. First off because idling produces more soot for the DPF to deal with, and second because the DPF does not get hot. It needs to reach a certain temp for regen but even when not running a regen the hotter it is the more soot it burns off even without the regen.

 

[jyoutz]

For a diesel it's the opposite- it stays too cold.

Diesels don't have throttles to restrict air flow. They're wide open all the time. The power is varied by changing the amount of fuel only. This means that diesels are cold when they are idling. That's probably not good for a non DPF engine but it's really bad for the DPF. First off because idling produces more soot for the DPF to deal with, and second because the DPF does not get hot. It needs to reach a certain temp for regen but even when not running a regen the hotter it is the more soot it burns off even without the regen.

But if the diesel has a turbo, it needs to be idled before shutdown.

 

[deserteagle71]

I know my Toyota Tacoma manual says not to leave on idle, but why is my question, does something melt or overheat..?

Wet stacking - Wikipedia

en.wikipedia.org

 

[ericm979]

But if the diesel has a turbo, it needs to be idled before shutdown.

Yes the turbo need to cool down for shutdown if it was spooling hard. But the OP was asking about idling all the time.

Many modern turbo engines have after run coolant pumps specifically to cool the turbo after shutting the engine down so you don't need to let it idle.