DPF question
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From: Florida
DPF question
I have a 2015 F250 diesel. I'm relatively new to diesel and I am learning about DPF. I see a message telling me it's going into cleaning mode. When it does, my mileage drops off noticeably. When it's done, I would expect the mileage to pick back up. (Instantaneous mileage). It never seems to do that until I shut off the engine and restart. I figured I just hadn't driven long enough. Today it did it for over and hour on the highway until I got where I was going. It never increased mileage until I went on my next trip. It seems to go into cleaning mode every 300 miles or so. I drive mixed highway and city. Most trips are under 30 minutes. There is some idling waiting for kids at school.
Should it pick back up the mileage on its own? Does the frequency seem too often?
Thanks.
Should it pick back up the mileage on its own? Does the frequency seem too often?
Thanks.
Lead Driver
Joined: Nov 2005
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The mpg readout isn't instantaneous, it is the average of all miles since it was last reset so it takes a while after the regen process before it starts to climb back up. Since your fuel economy doesn't start to pick back up until after a restart then the regen cycle probably hadn't been completed before you shut the truck off.
And new trucks that are run the way you use yours do active regen more often as the EGT's don't stay high enough for passive regen. The longer you run down the highway the better for lowering active regen frequency.
The reason for the big fuel economy drop under active regen is that extra fuel is being injected into the exhaust stream to cause a burn off of the soot in the DPF. Passive regen occurs when the continuous load on the exhaust, like you get on extended highway running, makes the temp in the DPF to be high enough to burn off the soot without needing the extra injection of fuel.
And new trucks that are run the way you use yours do active regen more often as the EGT's don't stay high enough for passive regen. The longer you run down the highway the better for lowering active regen frequency.
The reason for the big fuel economy drop under active regen is that extra fuel is being injected into the exhaust stream to cause a burn off of the soot in the DPF. Passive regen occurs when the continuous load on the exhaust, like you get on extended highway running, makes the temp in the DPF to be high enough to burn off the soot without needing the extra injection of fuel.
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New User
Joined: Oct 2014
Posts: 12
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From: Florida
DPF
The mpg readout isn't instantaneous, it is the average of all miles since it was last reset so it takes a while after the regen process before it starts to climb back up. Since your fuel economy doesn't start to pick back up until after a restart then the regen cycle probably hadn't been completed before you shut the truck off.
And new trucks that are run the way you use yours do active regen more often as the EGT's don't stay high enough for passive regen. The longer you run down the highway the better for lowering active regen frequency.
The reason for the big fuel economy drop under active regen is that extra fuel is being injected into the exhaust stream to cause a burn off of the soot in the DPF. Passive regen occurs when the continuous load on the exhaust, like you get on extended highway running, makes the temp in the DPF to be high enough to burn off the soot without needing the extra injection of fuel.
And new trucks that are run the way you use yours do active regen more often as the EGT's don't stay high enough for passive regen. The longer you run down the highway the better for lowering active regen frequency.
The reason for the big fuel economy drop under active regen is that extra fuel is being injected into the exhaust stream to cause a burn off of the soot in the DPF. Passive regen occurs when the continuous load on the exhaust, like you get on extended highway running, makes the temp in the DPF to be high enough to burn off the soot without needing the extra injection of fuel.
Lead Driver
Joined: Nov 2005
Posts: 8,450
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I have a lowly XL that doesn't have that high falutin' lcd display on the dash with all those fancy colored bars and such...
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From: Florida
Yeah but I don't have the cool travel trailer. I'll trade!
-Craig
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