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10-20-2021, 05:54 PM
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#1
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Member
Join Date: Sep 2021
Location: Lillian AL
Posts: 93
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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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10-20-2021, 09:34 PM
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#2
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Registered User
Newmar Owners Club Ford Super Duty Owner Freightliner Owners Club Retired Fire Service RVer's
Join Date: Jan 2019
Location: Rosemary Farm, Northern Ca
Posts: 5,444
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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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10-21-2021, 04:35 AM
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#3
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Senior Member
Join Date: Jul 2014
Posts: 35,349
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Never heard of a doser valve, maybe a closer valve as in exhaust brake ?
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10-21-2021, 07:59 AM
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#4
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Member
Join Date: Sep 2021
Location: Lillian AL
Posts: 93
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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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10-21-2021, 08:05 AM
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#5
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Senior Member
Join Date: Jul 2015
Posts: 1,881
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Quote:
Originally Posted by Retired tom
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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Your 2007 has a DPF? I thought 2008 was the start date for those.
__________________
2010 Phaeton 40QTH on a PG Chassis.
2017 Lincoln MKX.
Air Force One brake system and Blue OX Towbar.
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10-21-2021, 08:44 AM
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#6
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Senior Member
Join Date: Jul 2017
Posts: 202
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Quote:
Originally Posted by Retired tom
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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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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10-21-2021, 09:19 AM
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#7
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Registered User
Newmar Owners Club Ford Super Duty Owner Freightliner Owners Club Retired Fire Service RVer's
Join Date: Jan 2019
Location: Rosemary Farm, Northern Ca
Posts: 5,444
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Quote:
Originally Posted by Caliber
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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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:
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10-21-2021, 02:24 PM
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#9
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Member
Join Date: Sep 2021
Location: Lillian AL
Posts: 93
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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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10-21-2021, 05:10 PM
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#10
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Registered User
Newmar Owners Club Ford Super Duty Owner Freightliner Owners Club Retired Fire Service RVer's
Join Date: Jan 2019
Location: Rosemary Farm, Northern Ca
Posts: 5,444
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Quote:
Originally Posted by Retired tom
Coach is 2008, engine is 2007 with dpf. I thought it may have post injection but wasn't sure. Thanks
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Are you having problems with it? Or with the DPF?
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10-21-2021, 06:26 PM
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#11
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Member
Join Date: Sep 2021
Location: Lillian AL
Posts: 93
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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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10-21-2021, 06:45 PM
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#12
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Senior Member
Entegra Owners Club
Join Date: Mar 2020
Location: Lubbock, TX
Posts: 124
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Quote:
Originally Posted by Retired tom
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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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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John & Pam Prosser - Lubbock, TX
2019 Anthem 44W - 2015 Jeep Grand Cherokee
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10-21-2021, 07:58 PM
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#13
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Member
Join Date: Sep 2021
Location: Lillian AL
Posts: 93
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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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10-21-2021, 10:11 PM
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#14
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Registered User
Newmar Owners Club Ford Super Duty Owner Freightliner Owners Club Retired Fire Service RVer's
Join Date: Jan 2019
Location: Rosemary Farm, Northern Ca
Posts: 5,444
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Quote:
Originally Posted by Retired tom
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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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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