Nov-13-2017 11:17 AM
Dec-09-2017 12:30 PM
Dec-09-2017 02:41 AM
moleary wrote:
We've owned our 2012 Winnebago Tour for 2 years and traveled roughly 15000 miles. We purchased it with 17000 miles. I have yet to experience a DEF re-gen cycle. Isn't there a dashboard light to notify that the cycle is occurring? Ninety percent of our travels are at interstate speeds and conditions(if that makes any difference). I thought it would have called for a re-gen at least once during this time.
Everything is running fine, just wondering why.
Dec-08-2017 06:19 PM
Nov-14-2017 12:04 PM
bullydogs1 wrote:
DEF has to be consumed all the time as it turns exhaust to water and a harmless gas...My regen light in my old coach used to go on about once every 5000 miles or so (once a year) and go off after about a half hour...Present coach has 10000 miles on it and it has not gone on once...Fuel mileage is better with the setup too..And although the door is on the right side..Im perfectly OK with adding the 2.5 gallon jug I buy and putting it in..not a big deal..The only coach I have ever seen with both the fuel door and the DEF port right next to each other is a Prevost...Even the driver side port for most coaches is on the rear of the coach...so you have to go back in and move the coach anyway.
jplante4 wrote:Mile High wrote:
So DEF is consumed if when not in Regen?
Yes. There's a typical EPA story here. They mandated a reduction in NOX which was met by recircing the exhaust gases like they did in cars in the 70s.
This in turn decreased the exhaust gas temps (EGT) and cause some unburned fuel to get passed through which caused diesel particulate matter (soot). The DPF removed the soot, but increased the NOX. Injecting DEF allowed the builders to cut down on the amount of recirc and increase the EGTs to reduce the soot and turning the NOX into water and N2,
The DPF and the SGR (where the DEF is injected into) are separate chambers that look like mufflers.
DEF is injected all the time. Regen increases the temp of the exhaust to "burn" off the soot in the DPF.
Confusing enough?
Nov-14-2017 08:13 AM
Nov-14-2017 07:52 AM
Mile High wrote:
So DEF is consumed if when not in Regen?
Nov-14-2017 07:03 AM
Nov-14-2017 05:49 AM
Nov-14-2017 04:49 AM
11178adm wrote:
as stated in another post the DEF system does not regen but the diesel particulate filter (DPF) does. if the regen occurs when driving there is no effect on the engine operation and no indicator light unless the vehicles speed drops below about 7 mph during the regen then a high exhaust temp light will come on until the DPF and SCR catalyst cools down or the vehicle speed goes back up, if the high exhaust temp light is on it is a good idea to not shut the engine off until the light goes out. I am assuming it is probably a ISL cummins if it is next time you are in a cummins shop and they are plugged into the ECM ask them to print out the regen history, it might surprise you how often I happens.
Nov-13-2017 06:05 PM
Nov-13-2017 06:03 PM
Nov-13-2017 05:23 PM
Nov-13-2017 04:47 PM
Nov-13-2017 03:47 PM