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Thanks for getting back so soon. To answer your questions there isn't very much soot in the tailpipe. Hasn't been a complaint of low power. When I had the DPR off a month ago the inlet pipe was pretty normal no excess sludge from turbo leaking. But I do like your injector theory when I started...

I'm working on a model 236 hino. 08 ym. A month ago the truck had to have the DPR regenerated several times a week toward the end twice a day. I removed the DPR and had it cleaned at the local Kenworth dealer. It was fine for a month now were back to daily regens. No check engine light or...