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Fuel heater grid?

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2008 68rfe P0775 P0846 Help

P0776

Thanks, Not to start a fight, just trying to get the dynamics of how it works. Answer to another post says EGR recircs to intake track which goes to plenum and back across grid heater right? does the EGR have the soot cleaned from DPF or is that some how channeled separate to the exhaust system?

Nooo, all that nasty soot goes right into the plenum and creates a mess. Has been speculated that the soot and resulting acids it creates on the grid heater is potentially responsible for the failures on that stud. Worse yet, the EGR gas is cooled so the soot precipitates out easier. The DPF is way downstream of the turbo and any of the EGR system parts, they are in no way connected. The DPF attempts to filter the soot of out exhaust stream which stoich rich from the programming to limit NOX emissions, a never perpetual cycle of patches to address the EPA regs.
 
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