rough idle bad milage weak jakes

[Rawze]

(09-01-2019 )shawnkw Wrote:  2011 cm2250 isx15 symptoms are a really rough idle, bad mileage down to 5.5 from 6.7, and the jakes aren't as strong as they used to be. truck is a day cab local fuel hauler. I idle a lot pumping off but I pump at 900rpm.

I know I need to have the overhead ran. Should I also check the cam as well?

Those descriptions are pretty vague ...

kinda point towards a stuffed up exhaust of intake ... or a clogged up IMAP, or possibly an EGR valve opening too far.

Any check engine lights?

Does it pass a rail leak test?

Injector cut-out tests?

you say you put a re-man DPF on it ... what about the DOC and SCR elements? For all you know, the DOC could be getting face plugged?.


You have an engine that requires software to work on it... Invest in the software and an older windows7 laptop --- learn how to do things yourself.