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I have a MP8 not completing a regen, doser on 540 degreesdpf…

Customer Question
I have a MP8 not...
I have a MP8 not completing a regen,
doser on 540 degrees
dpf inlet 750 degrees
dpf outlet 750 degrees
When it reaches these temp the doser shuts off
new doser, new dpf, cleaned doc, new ambient air temp sensor
mack vin#8N001449
Submitted: 7 years ago.Category: Medium and Heavy Trucks
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Answered in 2 hours by:
3/7/2015
Technician: Andy, Truck Diagnostic Technician replied 7 years ago
Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3,030
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter
Verified
Hi there ! Sorry to hear you are having trouble! My name is ***** ***** I would like to try and help if I can ! Can you tell me what the mileage and hours are too please ? Is this the original DOC ? Have you ever had coolant go through the exhaust? Also how long doe the regen run before it cancels out ?
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Customer reply replied 7 years ago

290000 miles this is the original doc no coolant through exhaust

as soon as the temp gets up to 595 doc 750 dpf inlet 750 dpf outlet

about 15 minuts, then it shuts off doser

Technician: Andy, Truck Diagnostic Technician replied 7 years ago
The DOC 's job is to react with the fuel as it is coming through the exhaust to raise the temperature high enough to burn the soot into harmless gases and ash . It is of a honeycomb shaped ceramic material inside coated with a precious metals coating which is what reacts with the fuel . Since you have already replaced the doser, cleaned both the DOC and the DPF , I believe the fix will be to replace the DOC . The ECM expects to see a certain rise in temperature at the DPF inlet once it starts injecting fuel into the exhaust stream . If it doesn't reach the desired temp by a certain amount of time , it should spit out a code and cause a warning lamp to come on . Eventually , your exhaust system would plug up as it cannot clean itself out . I have seen DOC's lose their efficiency completely .
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Technician: Andy, Truck Diagnostic Technician replied 7 years ago

Hi there DOC! I see you viewed my last post ! Is there anything else I can help with ? Let me know ! Happy to help!

Pleae don't forget to rate my service to you at the end of this session . That is the only way that I am rewarded on here . Thanks.

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Technician: Andy, Truck Diagnostic Technician replied 7 years ago

Hi there ! Just looking for an update on this ! How are we doing ? Let me know if you need anything else .

Please don't forget to rate my service at the end of this session . That is how I am rewarded at all on here . Thank you .

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Andy
Andy
Andy, Truck Diagnostic Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3,030
3,030 Satisfied Customers
Experience: International and Isuzu trucks , International, Maxxforce, Cummins and Isuzu engines, Diagnostic and electrical troubleshooting specialist , Hvac and truck /trailer refrigeration troubleshooter

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