br549 Posted January 20, 2015 Share Posted January 20, 2015 Driver said he done 4 or 5 regen and lighting bolt came on. Hook up tech tool and shows mid128 ppid fmi 0, mid128 psid 47 fmi 12, both shows active. soot level show 144%. Started regen with computer it ran about 45 minutes, soot level did not go down and shows 6 regens now. Temp got to about 900 degrees. Diff pressure only shows 0.37. Before when regen would not finish it was 7th injector clogged up. It completes the regen but soot level does not go down. Any ideals? Quote Link to comment https://www.bigmacktrucks.com/topic/38528-2008-cxp-regen-mp8-425/ Share on other sites More sharing options...
farmer52 Posted January 20, 2015 Share Posted January 20, 2015 DPF might have face plugging. If so, you will need to "bake" it. Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment https://www.bigmacktrucks.com/topic/38528-2008-cxp-regen-mp8-425/#findComment-275196 Share on other sites More sharing options...
turckster Posted January 21, 2015 Share Posted January 21, 2015 There is really not enough info, but for what you've given so far I'd say there is not enough temperature. If 900 deg is the highest it got (pre DPF temp) and the outlet was below this then your temps are too low. On a face plugged DPF/catylist the outlet temp will pass the pre DPF temp and continue to rise during the regen. Face plugging is caused by a dirty 7th injector-when the adaptive factor is near the top end of the chart. Are you sure the 7th inj. is flowing properly? Did you reset the adaptive factor for the 7th inj.? During a regen, what is the 7th inj. duty cycle %?, If it is 20+% then it is a sign of becoming clogged or poor flow. More Info needed 1 Quote Link to comment https://www.bigmacktrucks.com/topic/38528-2008-cxp-regen-mp8-425/#findComment-275241 Share on other sites More sharing options...
br549 Posted January 21, 2015 Author Share Posted January 21, 2015 pulled the 7th injector this morning and it was clogged, cleaned and regen. temp got to 1150 degree and when done soot level went down to 6% and dpf diff was .07thanks 2 Quote Link to comment https://www.bigmacktrucks.com/topic/38528-2008-cxp-regen-mp8-425/#findComment-275295 Share on other sites More sharing options...
turckster Posted January 22, 2015 Share Posted January 22, 2015 pulled the 7th injector this morning and it was clogged, cleaned and regen. temp got to 1150 degree and when done soot level went down to 6% and dpf diff was .07thanksGlad you figured it out Quote Link to comment https://www.bigmacktrucks.com/topic/38528-2008-cxp-regen-mp8-425/#findComment-275368 Share on other sites More sharing options...
Mackpro Posted January 23, 2015 Share Posted January 23, 2015 Also a regen will "time out" after 45 min. Without VCADS/Techh tool you wont know if the soot level dropped or if the regen was good. Quote Link to comment https://www.bigmacktrucks.com/topic/38528-2008-cxp-regen-mp8-425/#findComment-275500 Share on other sites More sharing options...
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