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Old 10-20-2021, 06:54 PM   #1
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Exhaust doser

Anyone know where the exhaust doser valve is located on a 2007 Cummins 400 isl
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Old 10-20-2021, 10:34 PM   #2
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Ive never heard of it referred to as exhaust doser valve, but if you mean the DEF dosing unit, it is only found on 2010 and later diesels so equipped - you wont find one on a 2007 chassis.
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Old 10-21-2021, 05:35 AM   #3
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Never heard of a doser valve, maybe a closer valve as in exhaust brake ?
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Old 10-21-2021, 08:59 AM   #4
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The doser injector sprays fuel into exhaust to create heat to do a regen, this is an active regen, not passive. This gives you the high exhaust symbol when doing an active regen. I think some engines use a different method.
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Old 10-21-2021, 09:05 AM   #5
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Quote:
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The doser injector sprays fuel into exhaust to create heat to do a regen, this is an active regen, not passive. This gives you the high exhaust symbol when doing an active regen. I think some engines use a different method.
Your 2007 has a DPF? I thought 2008 was the start date for those.
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Old 10-21-2021, 09:44 AM   #6
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The doser injector sprays fuel into exhaust to create heat to do a regen, this is an active regen, not passive. This gives you the high exhaust symbol when doing an active regen. I think some engines use a different method.
The ISL uses in cylinder post injection from the injectors to add fuel. There is no doser. The ISX series uses a doser.
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Old 10-21-2021, 10:19 AM   #7
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The ISL uses in cylinder post injection from the injectors to add fuel. There is no doser. The ISX series uses a doser.
But neither should be found on a 2007. If you do have a DPF, the injector would be easy to locate, installed somewhere down stream from the turbo on the exhaust piping or on the DPF itself.

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Old 10-21-2021, 12:17 PM   #8
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But neither should be found on a 2007. If you do have a DPF, the injector would be easy to locate, installed somewhere down stream from the turbo on the exhaust piping or on the DPF itself.

Looks like this:
Are you sure????

U.S. EPA 2007/2010 Heavy-Duty Engine and Vehicle Standards and Highway Diesel Fuel Sulfur Control Requirements | MECA
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Old 10-21-2021, 03:24 PM   #9
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Coach is 2008, engine is 2007 with dpf. I thought it may have post injection but wasn't sure. Thanks
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Old 10-21-2021, 06:10 PM   #10
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Coach is 2008, engine is 2007 with dpf. I thought it may have post injection but wasn't sure. Thanks
Are you having problems with it? Or with the DPF?
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Old 10-21-2021, 07:26 PM   #11
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My dpf keeps putting me in limp mode, I don't know why it won't do an active regen before it puts me into limp mode
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Old 10-21-2021, 07:45 PM   #12
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My dpf keeps putting me in limp mode, I don't know why it won't do an active regen before it puts me into limp mode
Most any truck service shop will have a diag programmer tool to force a regen on your coach. This is the second thing a Cummins shop will do, first being read all active codes and then do a force regen.
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Old 10-21-2021, 08:58 PM   #13
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I can do a forced regen myself, but you shouldn't have to do that, the engine should do that on its on before it goes into limp mode, but it doesn't
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Old 10-21-2021, 11:11 PM   #14
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I can do a forced regen myself, but you shouldn't have to do that, the engine should do that on its on before it goes into limp mode, but it doesn't
In a perfect world it should but since it depends on driving conditions it doesn't always work that way. Unless operating conditions are conducive to an active regen its not going to happen, or at best it will initiate but not complete the process, and the passive regen process isn't sufficient long term. OTR Diagnostics recommends that you do a forced regen monthly as a matter of maintenance if you do a lot of local driving.

I find that I often interrupt an active regen by getting off the freeway because I have no way of knowing its occurring until Ive interrupted it. So when this happens I either get back on the highway and drive it hard enough, long enough, or do a forced regen.

Its also a good idea to remove and inspect the DOC and DPF at some point. Im thinking 50-60k miles. A common recommendation is annually or every 1000 hours. That seems a bit excessive if you are doing plenty or sucsess full regens. Other sources recommend a 200,000 mile cleaning interval and Ive read that ISX systems can go 500k. But Ive also read about replacements needed under at 60k. There are a lot of variables.

One of the nice things about OTR diagnostics is that I can use it to read my percent soot load. So as long as my regens can return it to zero, Im not going to get too concerned about it. All my experience is with later model systems but Im guessing my DOC and DPF are about the same as yours.
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