Ok, so I have all the emissions intact. I run b20 bio. During a regen, is it better to kick it out of overdrive and run at slightly higher rpms? I've tried this and didn't notice much of a difference in fuel mileage. I try and let the truck run down the interstate until it's done. I usually don't have to make a special trip as I drive a lot to the track and errands.
I'm a light footed driver. I usually make a conscious decision to lay into the throttle at least once or twice a tank just to clean out the system. Would it be best to do this during the regen?
I have no scientific data to add to this, just what I have done, which is nothing really. I have almost 70k on my 2012, all stock. Knock on wood, I have never had any emissions issues. I get a regen per tank, like clockwork, but I don't always let it finish. I usually am in a hurry so more often than not if I am mid-regen I just shut it off and it will continue the next time I drive it. I realize not the best idea, but it is what it is.
Yeah the last time my truck had a regen, I floored it on take off and it blow out a cloud of white smoke . I don't know if this is normal or not???? when regen was done it was fine.
I wasn't sure if the "punch it" a couple of timed during the regen is good or bad. Like I said, I'm typically a light footed driver, so I do this a few times a tank. Maybe not always matted for a long period of time. Just enough to blow out the system. Since I'm doing it anyway, I figured why not during a regen. Just wordered if this would be more harm than good.
The white cloud is not soot ash, its unburnt diesel fuel. Lots of people report this and I find mine does it more often if I am in regen around town babying it. Tends to load the DPF up with diesel that clears out when you stomp on it
What I dislike is a regen when I am in stop and go traffic. About the only time I recall seeing white smoke was when it was cold outside, less than 30 degrees. One day I was in traffic and stomped on it at a green light because I was the first person and swoosh a cloud of white smoke. I swear I couldn't see the car behind me. I bet they were mad as h***. Those da** diesel trucks. I haven't seen it do that this winter so far.
Good info guys about unburnt fuel. Kinda justifies my thought process. Doesn't cost much fuel to try and drive it to complete the regen. Especially if I'm already on the interstate. I just go for a little joy ride if time permits.
Trust me it gets old after a while especially if you have a truck that regens as often as mine does. I use to do this but no longer extend my trips. Just let it do its thing because at the end of the day it will just regen again in another 150-200mi regardless of how hard/long I run it in its current regen cycle.
Before I deleted I would usually try to go for a joy ride during regen to let it complete it. I would step on it once or twice during regen and get the white/grey cloud then hop on the highway and cruise at 70 for a while. I believe the smoke is ash from the dpf because my buddy was behind me once and he said it smelled like a burnt smell not like fuel. I gained 4mpg average after deleting and save a ton of fuel by not going out of my way for regens
Regen is still occurring and soot is being burnt off so yes its still going to smell(like something burning...). The white cloud IS unburnt diesel fuel, not ash.
I couldn't find anything in the manual telling me to rub its lower back while in regen mode. AKA I drive my truck and turn my brain off in regards to regens.
@Sandman_73 I was having short regens like you and eventually my truck never pulled out of regen. I had to limp it to the dealership and medium story short, the 9th injector was clogged. Now my regens seem to be getting farther apart pushing 330-350 miles between regens now. I do mixed freeway, 75-80, and city driving.
Unfotunately my truck wont go into limp or throw a CEL so I am stuck between a rock and a hard place. With no CEL GM just tells you its "working as designed" and will do nothing to try and diagnose.
Oh trust me, once I'm out of warranty or the thing is paid off, which ever occurs first, the emissions crap is gone. However, I'm currently getting over 400 miles between regens and I'm trying to keep it that way.
Drive it like you would any other vehicle and let it do its deal.If you were to shut it off during a regen,it will start back up from were you left off.
Regens are best completed before shutting off the engine which makes sense as it takes time and fuel to get the DPF up to the necessary temperature and going half way and then letting it cool down and then start all over again is going to waste fuel.
I have two gas powered cars that I use for short trips like going to the grocery store. I use my diesel powered truck for hauling items that will not fit into the cars or to go off-road or to tow. It takes roughly 20 minutes for a diesel engine to get to a fuel efficient operating temperature and shorter trips waste fuel and generate more contaminants in the motor oil and the related problems. Not a smart approach unless you have money to burn.
Driving only for a regen wastes the fuel plus the fuel to do the wasted driving plus it wastes the drivers time (which is likely worth more than the fuel).
Ignoring regens MIGHT mean the regen takes longer, but it doesn't waste the fuel for the extra driving and it doesn't waste the drivers time.
Life became simpler after choosing to ignore regens.
(as GM intended)
Ok guys I am new here and new to the diesel trucks. This may be a dumb question but how do you know it's doing a regen? I just got a service exhaust system message and the light came on along with the engine light with code P20B9. I filled up the fluid but it didn't take much and the lights are still on and the message is still displayed.
Ok guys I am new here and new to the diesel trucks. This may be a dumb question but how do you know it's doing a regen? I just got a service exhaust system message and the light came on along with the engine light with code P20B9. I filled up the fluid but it didn't take much and the lights are still on and the message is still displayed.[/QUOTE
If you are idling at a stoplight you will see RPM's are increased more than normal and a burned rubber smell if your windows are down.Now if you are driving the only way to tell is if you have a CTS monitor.The best thing to do with a regen is drive the truck like if you would any other vehicle and it will let you know if something is wrong like your engine light now.
Yup, idle is around 750 during regen. I always keep the dash screen on the mpg screen. I know I'm in regen on the interstate when my mpgs drop to a rough 14-16 mpgs (non towing).
was told it did a better job of regeneration at idle than it did while running down the highway something about deeper cleaning have no idea myself just know mine does it about every second or third tank of fuel usually in the morning on way to work have the cts and it shows regin also fuel millage falls into the 14 mpg range I just leave it in cruse at 55 and it is finished by the time I have to be slowing down for town driving
That is not correct. The DPF needs heat and exhaust flow across the catalyst to remove the soot. Too much idling can lead to a situation where the DPF cannot effectively clean itself.
From the owner's manual:
Under certain driving conditions,
such as stop-and-go traffic, the filter
cannot clean itself. The CLEANING
EXHAUST FILTER KEEP DRIVING
UNTIL MESSAGE IS CLEARED
message comes on when the DPF
is dirty and needs to perform a self
cleaning.
For the filter to clean itself, the
vehicle must be driven above
50 km/h (30 mph) until the
CLEANING EXHAUST FILTER
KEEP DRIVING UNTIL MESSAGE
IS CLEARED message goes off.
This will take about 30 minutes.
I have been tracking my regens for a while now using the Edge CTS, in 2015 my average length to do a regen was 37 miles. My truck goes about 533 miles between them and it takes on the average 1.2 hours of run time to complete them and I loose about 1.0 MPG while they are happening. I have tried many things with mine to see if I can help them any way and I have found the best thing to do is work your truck and forget about it, it is what it is and unless you want to or can delete its really a nonissue. Of course your results may vary just my $0.02 worth.
Rush hour traffic means there is often days when I am under 30 mph the whole time. This means driving to the next town in order to prevent nasty messages on the DIC. I guess GM engineers never heard of the word "gridlock". So much for my carbon footprint.
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