br549 Posted April 18, 2014 Share Posted April 18, 2014 Truck running good driver did sitting regen. Truck feels like it is derated, no lighting bolt. Ck for codes found 128 pid173 fmi0 inactive 20x, 140 sid 253 fmi 2 active but no lighting bolt on. clear codes 140 still stays active. Checked soot level at 19%. Drove bobtailing truck about 30 miles turbo pressure would never go over 7 lbs exhaust would go to 800-1000 degree on hill. Came back ck soot level was 30%. Ck DPF pressure and ok. Truck will barely pull itself. Quote Link to comment https://www.bigmacktrucks.com/topic/35461-2008-chu-low-power-after-regen/ Share on other sites More sharing options...
wheeler73 Posted April 19, 2014 Share Posted April 19, 2014 Check for a boost leak. I had one the other day do the same thing and the charge aircooler was split on the top row. Quote Link to comment https://www.bigmacktrucks.com/topic/35461-2008-chu-low-power-after-regen/#findComment-242584 Share on other sites More sharing options...
wheeler73 Posted May 1, 2014 Share Posted May 1, 2014 What did you find? Quote Link to comment https://www.bigmacktrucks.com/topic/35461-2008-chu-low-power-after-regen/#findComment-243905 Share on other sites More sharing options...
br549 Posted May 2, 2014 Author Share Posted May 2, 2014 The recirulating valve in front of turbo had air pressure holding it open. Replaced the control valve on left lower side of the motor that controls it. Been a couple of weeks so far so good. r Quote Link to comment https://www.bigmacktrucks.com/topic/35461-2008-chu-low-power-after-regen/#findComment-243984 Share on other sites More sharing options...
wheeler73 Posted May 2, 2014 Share Posted May 2, 2014 Great. I forgot about that valve. Quote Link to comment https://www.bigmacktrucks.com/topic/35461-2008-chu-low-power-after-regen/#findComment-244001 Share on other sites More sharing options...
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