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Old 05-23-2022, 09:19 PM   #1
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Dpf question

I have Cummins ISL 8.9 400 hp that has the dpf an not def. Wondering when refueling or stopping for a quick lunch, is it okay to leave engine idling rather than shutting engine off? Not sure about clogging up dpf filter idling.
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Old 05-23-2022, 09:35 PM   #2
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when refueling? Absolutely Not..
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Old 05-23-2022, 10:14 PM   #3
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Yes it will clog your DPF.
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Old 05-24-2022, 01:45 PM   #4
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Never ever let a late model emission controlled diesel engine idle any longer than absolutely necessary, it will cause very expensive problems.
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Old 05-24-2022, 01:57 PM   #5
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The only time you’d want to keep it running, preferably driving at speed under light to moderate load, would be when the DPF is going through the regeneration cycle. From what I’ve heard, this most commonly occurs just as you reach your destination.
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Old 08-01-2022, 12:21 AM   #6
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Common question: where is the DSP manual regeneration switch on Tiffins? Is it hidden?

Yes, there is a hidden DPF regeneration switch on Tiffins in order to conduct a manual diesel particulate filter regeneration. The switch is hidden under the dash at or about the driver’s left knee, just to the left of the steering wheel.

You will need to position yourself on the floor of the coach, looking up under the dash, and look to the left of the steering column. You will find 2 wires connected via a plastic connection and marked “regeneration.”

While the engine is turned on, the coach is parked and not moving: you need to disconnect the connection for at least 4 seconds (so says Freightliner) and then reconnect the wire connection.

This will force a “manual DSP regeneration.” Your engine RPM will rise slightly (perhaps to 1,000 rpm or so), and your gauge cluster will illuminate an icon that tells you that you are in manual DSP recreation or put a warning icon on your dash warning of high temperature exhaust: this confirms that you are in DSP regeneration.

You must allow the regeneration to occur and complete before putting the RV into gear or turning it off. The regeneration process will generally take 30-50 minutes.

After the regeneration is completed the engine RPM will drop back down to a normal idle (700 rpm or so) and you are now ready to drive again.
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Old 08-01-2022, 07:15 AM   #7
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Quote:
Originally Posted by Tonester View Post
Common question: where is the DSP manual regeneration switch on Tiffins? Is it hidden?

Yes, there is a hidden DPF regeneration switch on Tiffins in order to conduct a manual diesel particulate filter regeneration. The switch is hidden under the dash at or about the driver’s left knee, just to the left of the steering wheel.

You will need to position yourself on the floor of the coach, looking up under the dash, and look to the left of the steering column. You will find 2 wires connected via a plastic connection and marked “regeneration.”

While the engine is turned on, the coach is parked and not moving: you need to disconnect the connection for at least 4 seconds (so says Freightliner) and then reconnect the wire connection.

This will force a “manual DSP regeneration.” Your engine RPM will rise slightly (perhaps to 1,000 rpm or so), and your gauge cluster will illuminate an icon that tells you that you are in manual DSP recreation or put a warning icon on your dash warning of high temperature exhaust: this confirms that you are in DSP regeneration.

You must allow the regeneration to occur and complete before putting the RV into gear or turning it off. The regeneration process will generally take 30-50 minutes.

After the regeneration is completed the engine RPM will drop back down to a normal idle (700 rpm or so) and you are now ready to drive again.
On our farm tractors that have that system, the regeneration process takes 10 min. If the regen warning displays, we always try to let it complete the process. Every now and then, it gives you a message that it can’t regenerate automatically and you have to force it into regenerating.

I understand different systems may operate in a different manner including regenerating times.
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Old 08-01-2022, 07:38 AM   #8
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The earlier versions of the DPF filters may or may not have the regeneration function.

I see by your profile you have a 2008 Monaco. You should check your manual on the DPF system and whether it has a regen function.



In ~2006-9 I worked at a mining complex with 3 mines and was responsible for the maintenance department. During this period the engine manufacturers were starting to install this equipment to reduce emissions, some new equipment didn't come with them, and we also had to retrofit older equipment with the DPF systems.

It was an expensive endeavor, we spent millions on these systems. We initially tried to retro fit all the equipment that didn't have the DPF systems but found that only the larger engines that were operated at high loads for extended periods of time were successful.

We had monitoring equipment and every oil change the info was downloaded. It basically showed the DPF slowly clogging with the soot, the exhaust back pressure would build but on the equipment that was run hard it would be at a much slower rate. Some of the equipment did regen and you could see that happen over a period of time. Equipment that wasn't run hard would clog quickly.

We invested in a high temp furnace and DPF filter cleaning machine. After the filter was baked the filter was mounted in the machine that would vibrate the filter and compressed air nozzles would blow the soot out (this was in a large sealed type container with filtering system so none of this went to the environment).



So my advise is to not idle the engine, and when you run it run hard. Push it so the engine gets up to temp. This will help your system.

Diesel engines rely on high combustion and heat to run efficiently.
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Old 08-02-2022, 06:25 PM   #9
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Quote:
Originally Posted by jacwjames View Post
The earlier versions of the DPF filters may or may not have the regeneration function.

I see by your profile you have a 2008 Monaco. You should check your manual on the DPF system and whether it has a regen function.



In ~2006-9 I worked at a mining complex with 3 mines and was responsible for the maintenance department. During this period the engine manufacturers were starting to install this equipment to reduce emissions, some new equipment didn't come with them, and we also had to retrofit older equipment with the DPF systems.

It was an expensive endeavor, we spent millions on these systems. We initially tried to retro fit all the equipment that didn't have the DPF systems but found that only the larger engines that were operated at high loads for extended periods of time were successful.

We had monitoring equipment and every oil change the info was downloaded. It basically showed the DPF slowly clogging with the soot, the exhaust back pressure would build but on the equipment that was run hard it would be at a much slower rate. Some of the equipment did regen and you could see that happen over a period of time. Equipment that wasn't run hard would clog quickly.

We invested in a high temp furnace and DPF filter cleaning machine. After the filter was baked the filter was mounted in the machine that would vibrate the filter and compressed air nozzles would blow the soot out (this was in a large sealed type container with filtering system so none of this went to the environment).



So my advise is to not idle the engine, and when you run it run hard. Push it so the engine gets up to temp. This will help your system.

Diesel engines rely on high combustion and heat to run efficiently.
You are so correct. Before we learned the regen process, when our tractors were new, we called the Case/ International folks at least 3 times because of the codes it was throwing. The one thing they finally told us is to never run this system for an extended period of time under 1000 rpm. We run hard and the equipment responds.
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Old 08-02-2022, 06:49 PM   #10
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Anytime you are idling you should be using the high idle setting.
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Old 08-02-2022, 08:43 PM   #11
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As others have said, if you have to idle, set your high idle. If you get to where youre having worrisome dpf filter lights, drop it down a gear or two, and run it hard to build as much heat as you can to clean up the filter. We had that issue earlier this year, it took about 40 miles to get it cleaned up.
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