TimB Posted July 11, 2011 Share Posted July 11, 2011 Vehicle returns with codes p246c and p2463 for soot accumulation. Previously replaced exhaust system and dpf sensor (would not regen at the time, said too clogged). DPF load= 45% Dist since last regen = 92 miles. avg regen =336 miles. soot_inf =1.799. DPF voltage = .49 at idle and spike to 4 volts while raising rpm. Instrument cluster reads "filter 0% full" Any Ideas? Quote Link to comment Share on other sites More sharing options...
cbriggs Posted July 12, 2011 Share Posted July 12, 2011 Are they still using the maf sensor as a critical input to dpf load calculations? If so it caused alot of problems on a few 6.4s I've seen. Quote Link to comment Share on other sites More sharing options...
TimB Posted July 26, 2011 Author Share Posted July 26, 2011 After several conversations with hotline, I was finaly informed that the auxillary coolant bottle leaks onto the air filter box contaminating the air filter and mass air flow sensor causing erratic readings. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted July 26, 2011 Share Posted July 26, 2011 Say what? Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted July 27, 2011 Share Posted July 27, 2011 Agreed, 'splain yoself mister! Quote Link to comment Share on other sites More sharing options...
Matt Saunoras Posted July 27, 2011 Share Posted July 27, 2011 did you confirm this actually happened? Quote Link to comment Share on other sites More sharing options...
TimB Posted July 28, 2011 Author Share Posted July 28, 2011 Fluid in coolant bottle was low. Found some residue on air filter. Swapped mass air flow sensors, did notice a difference in MAF readings. After replacing sensor DPF readings are more consitent, before they would go from 40% to 420% within the same day. Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted July 29, 2011 Share Posted July 29, 2011 Gonna have to bear with me for a minute here, I'm having trouble wrapping my head around this idea. Don't pay no never mind to them arrows in this photo. But looking at the photo, I am trying to figure out how a leaking secondary cooling system at any point and especially at or near the bottle (which is closest to the air box) could allow the air intake system to pull air born antifreeze into itself and wreak havoc. At any rate I would be more concerned about a leaking cooling system first rather than a skewed maf reading. Just thinking out loud, I have heard and read some very odd things concerning diagnosis of these new engines. Trying to take it all in (weed it out) and catalog it for future ref. Quote Link to comment Share on other sites More sharing options...
cbriggs Posted July 29, 2011 Share Posted July 29, 2011 I wonder if it could be from the overflow hose. There is no bottle on the secondary overflow, just a small hose elbow that dumps coolant besided the air box. Quote Link to comment Share on other sites More sharing options...
lmorris Posted July 29, 2011 Share Posted July 29, 2011 That hose goes down beside the part of the filter pulls air from under the hood. If the filter was slightly plugged or the foam was removed, I could see it sucking in coolant under a high load. Now to figure out why the secondary system would have purged coolant in the first place. Quote Link to comment Share on other sites More sharing options...
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