The rockers were all bad, i found on the forums that this is a common problem for cummins ISX
we did an overhaul, keeping same injectors
when we started the engine,it was running good.
but when pulling the trailer even empty, it runs tight.
It feels like somethings holds on the turbo or the wheels, it does not pull like before.
Yesterday In Oh for example, just south of Dayton claiming the big hill @ mm 40-ish, did not go better than 30 mi/h. that with a 80k lbs load.
Is this tight something normal until breaks in? i have a 475 HP ISX , turned to 525 by dr Diesel.
thanx for the imputs.