Exhaust Filter Cleaning
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New User
Joined: Jun 2014
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From: Phoenix, OR
Exhaust Filter Cleaning
The Exhaust Filter
- What triggers the automatic Exhaust Filter Cleaning?
- When it does, how long does it take to do the cleaning?
- How often is it supposed to do the cleaning?
- What triggers the automatic Exhaust Filter Cleaning?
- When it does, how long does it take to do the cleaning?
- How often is it supposed to do the cleaning?
Super Moderator
Joined: Aug 2008
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From: Frederick, MD
two types of cleaning.
Passive: Where the engine is working hard enough and hot enough to burn the soot off on its own. This is the best as it does not use any fuel, just the heat that is generated.
Active: This is the one where you will see the brief message. It can vary as to well this is called for. depends upon the soot level in the DPF. Unless you have something you can monitor it with you will not know the exact duration, but estimate 5-10 miles at most.
Also an active message is the mandatory drive to clean exhaust message. This happens when there has been too many interruptions of the cleaning cycle. When this occurs the message usually will stay present till completed. This message is rare though.
Passive: Where the engine is working hard enough and hot enough to burn the soot off on its own. This is the best as it does not use any fuel, just the heat that is generated.
Active: This is the one where you will see the brief message. It can vary as to well this is called for. depends upon the soot level in the DPF. Unless you have something you can monitor it with you will not know the exact duration, but estimate 5-10 miles at most.
Also an active message is the mandatory drive to clean exhaust message. This happens when there has been too many interruptions of the cleaning cycle. When this occurs the message usually will stay present till completed. This message is rare though.
Laughing Gas
Joined: Feb 2007
Posts: 950
Likes: 6
From: Waco, Texas
On my 2011, at normal driving, the Active regen process will run right at 12 minutes. I have timed it over and over. Now, pulling my 5er, it seldom does an active regen, maybe once every 500-600 miles. Also I am seeing that using Chevron Texaco diesel it regens more often that if I use WalMart or Flying J. Why you are thinking? I think it has to do with the Bio content. Chevron is saying 5 percent or less on the pump and WalMart and J's are now posted as B20 or 20 percent or less. That is my take.
Cargo Master
Joined: Jan 2007
Posts: 1,945
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From: Wasaga Beach, ON
I can tell when mine is doing a burn even if I miss the message. The fuel usage goes through the roof. Saturday it regen'd and it too about 25kms or so to complete. Fuel usage went from 12L/100km to 21L/100km
Senior User
Joined: Nov 2006
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Mine did a regen for the first time today. I am at just over 600 miles and it seemed to last somewhere between 5 and 10 miles. The instant fuel mileage indicator was showing way lower than it usually does on the highway. My average mpg before and after stayed at 15.0, so it didn't seem to affect my fuel mileage too much.
Lead Driver
Joined: Nov 2005
Posts: 8,466
Likes: 4,962
Lots of highway miles lowers the frequency of regens and the duration.
The pcm senses the soot load in the dpf and that tells it when a regen is needed.
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From: Phoenix, OR
Thanks, I've experienced the Active type and it seems like it does it for about 10 minutes.
When this happens, I thought maybe downshifting or accelerating to encourage hotter combustion, might be a good assistant to helping it burn off the soot faster, without wasting fuel. Also, I use the combination of AMSOIL Cetane Boost and Injector Cleaner to boost the combustion too.
Are there any other ways to get it hotter to help burn the soot, not use extra fuel and keep it as clean as possible?
When this happens, I thought maybe downshifting or accelerating to encourage hotter combustion, might be a good assistant to helping it burn off the soot faster, without wasting fuel. Also, I use the combination of AMSOIL Cetane Boost and Injector Cleaner to boost the combustion too.
Are there any other ways to get it hotter to help burn the soot, not use extra fuel and keep it as clean as possible?
two types of cleaning.
Passive: Where the engine is working hard enough and hot enough to burn the soot off on its own. This is the best as it does not use any fuel, just the heat that is generated.
Active: This is the one where you will see the brief message. It can vary as to well this is called for. depends upon the soot level in the DPF. Unless you have something you can monitor it with you will not know the exact duration, but estimate 5-10 miles at most.
Also an active message is the mandatory drive to clean exhaust message. This happens when there has been too many interruptions of the cleaning cycle. When this occurs the message usually will stay present till completed. This message is rare though.
Passive: Where the engine is working hard enough and hot enough to burn the soot off on its own. This is the best as it does not use any fuel, just the heat that is generated.
Active: This is the one where you will see the brief message. It can vary as to well this is called for. depends upon the soot level in the DPF. Unless you have something you can monitor it with you will not know the exact duration, but estimate 5-10 miles at most.
Also an active message is the mandatory drive to clean exhaust message. This happens when there has been too many interruptions of the cleaning cycle. When this occurs the message usually will stay present till completed. This message is rare though.
Last edited by BigF350; Jun 17, 2014 at 06:32 PM. Reason: stripped amsoil links
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Thread Starter
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New User
Joined: Jun 2014
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From: Phoenix, OR
I've been wanting to time it also, but they seem like less than 10 minutes before the Instant Mileage Indicator goes back to normal.
It must be working harder and hotter when pulling a load and doesn't need to go to Active mode. I agree with your Chevron review. I use Pilot, Loves, or the lowest price non-bio. When Active starts for me, it must be because it doesn't get up to a hot enough temp from not moving a heavy load.
To help it burn the carbon in the Exhaust Filter, I use AMSOIL Cetane Boost to increase the fuel combustion, along with their Injector Cleaner to help keep it as clean as possible.
It must be working harder and hotter when pulling a load and doesn't need to go to Active mode. I agree with your Chevron review. I use Pilot, Loves, or the lowest price non-bio. When Active starts for me, it must be because it doesn't get up to a hot enough temp from not moving a heavy load.
To help it burn the carbon in the Exhaust Filter, I use AMSOIL Cetane Boost to increase the fuel combustion, along with their Injector Cleaner to help keep it as clean as possible.
On my 2011, at normal driving, the Active regen process will run right at 12 minutes. I have timed it over and over. Now, pulling my 5er, it seldom does an active regen, maybe once every 500-600 miles. Also I am seeing that using Chevron Texaco diesel it regens more often that if I use WalMart or Flying J. Why you are thinking? I think it has to do with the Bio content. Chevron is saying 5 percent or less on the pump and WalMart and J's are now posted as B20 or 20 percent or less. That is my take.
Last edited by BigF350; Jun 17, 2014 at 06:31 PM. Reason: stripped amsoil links
Thread Starter
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New User
Joined: Jun 2014
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From: Phoenix, OR
Exhaust Filter Cleaning
Thanks. I've noticed that PCM must be sensing the soot load in the DPF and triggers the Active DPF cleaning. I've seems to happen on short term driving, a 50-50 combination of town and freeway driving, and not very often on longer freeway driving. For this, using AMSOIL Cetane boost must help it by adding to the diesel's combustion, and get the best mileage possible.
Last edited by BigF350; Jun 17, 2014 at 06:30 PM. Reason: stripped amsoil links
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New User
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From: Phoenix, OR
I bought mine 2 months ago and by using Cetane Boost and Injector Cleaner, I increased my average MPG by a little more than 2 MPG. I'll try going the next 2 tanks without any additives to find out what my average MPG goes to.
My next step is to change my tires from All Terrain to Highway Terrain tires, to go towards my goal of 23+ average MPG at 65 mph. I recently made the tire air psi to the recommended amount from 5 psi less for a smoother ride, and the MPG went up by almost 1 MPG.
My record so far is 705 miles on less than 35 of gal. diesel when the low fuel light came on.
Lead Driver
Joined: Nov 2005
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Measure any increase in fuel economy over many tanks of fuel and average it out. Too many variables happen going down the road to compare one tankful to another, and even more so unless you are traveling the same route each time you check.
Then you have to figure out if the cost of the additives is really offset by the mileage difference and hassle factor or if you are just trading dollars.
The tire changes are a definite thing to do to up the mileage. When you change, look for Low Rolling Resistance tires, save even more fuel. Mine has definitely improved since I got rid of the BFG A/T's.
Then you have to figure out if the cost of the additives is really offset by the mileage difference and hassle factor or if you are just trading dollars.
The tire changes are a definite thing to do to up the mileage. When you change, look for Low Rolling Resistance tires, save even more fuel. Mine has definitely improved since I got rid of the BFG A/T's.
Fleet Mechanic
Joined: Jun 2009
Posts: 1,346
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From: Connecticut
Measure any increase in fuel economy over many tanks of fuel and average it out. Too many variables happen going down the road to compare one tankful to another, and even more so unless you are traveling the same route each time you check.
Then you have to figure out if the cost of the additives is really offset by the mileage difference and hassle factor or if you are just trading dollars.
The tire changes are a definite thing to do to up the mileage. When you change, look for Low Rolling Resistance tires, save even more fuel. Mine has definitely improved since I got rid of the BFG A/T's.
Then you have to figure out if the cost of the additives is really offset by the mileage difference and hassle factor or if you are just trading dollars.
The tire changes are a definite thing to do to up the mileage. When you change, look for Low Rolling Resistance tires, save even more fuel. Mine has definitely improved since I got rid of the BFG A/T's.
FTE Leadership Emeritus
Joined: May 2004
Posts: 18,787
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From: Melbourne, Aus
I'd recommend Michelin Highway tires (MS2) if looking for good quality, long lasting, low rolling resistance tires.
If you haven't already - and you live in an area where you can get away with it - you may want to consider doing a DPF delete.
If you haven't already - and you live in an area where you can get away with it - you may want to consider doing a DPF delete.