New ISX motor ?

[Rawze]

(05-08-2019 )Camstyn Wrote:  A few questions, this is the only Cummins I’ve owned besides the 870.

Is 32psi oil pressure normal at operating temp, 1500rpm?

Is it normal for the turbo to continue to make close to 10lbs boost for a while after you’ve let off the throttle and started coasting? Feels like it’s putting resistance on the engine. Does not do it all the time.

Jake is weak, like weaker than my Paccar MX. You can hear/feel the difference between the 3 jake settings so 3rd stage is definitely activating. What could cause this in a brand new truck? It also shakes the truck (not violently) when it gets down to 1300rpm and under.

32 psi oil pressure sounds a bit low unless your oil temp is upwards of 230+ degF.


other than that, assuming it is not a de-mandated truck and still has factory programming,.. everything else you describe sounds normal. - How else is the engine supposed to keep the SCR can at 600+ degrees, or warm it up rapidly when it cools off too much?. The factory programming places a load on the engine (depending on what engine run mode it has chosen) with the turbo by choking the exhaust whenever it sees the exhaust cans getting cooled off too much.