ISX 500 Won't PULL

Take it to another shop. If the boost is that low either the lines are kinked, (easy to happen with the metal lines), or they could be clogged, the turbo is bad , or the seals are leaking, thats the whole job of the turbo is to give you that boost.

 

It's a cummins nuff said in my opinion. No JK take it somewhere else like a pete dealer and see what they say....if it's still under warranty then I guess you'll have to duke it out with cummins

 

my 585 only rund 32psi so i would say thats about in line for a 500..

 

Seems low to me.......I think you should see close to 40psi under a hard pull. Like musicimaker said check your air lines to the actuator on the turbo for restrictions. I have also seen lots actuators leak air around the rod and not have enough pressure to hold open the actuator. Also have your CAC tested for leaks. Any codes?

 

Cummins are great motors, in the proper application:

they are great on boats, however never saw one in a road tractor that was very impressive.........

Good Luck, hope you get her fixed !!!

 

Great for boats as anchors.

 

I had a same problem with mine. No power boost would not go past 25psi. Replaced fuel filters and problems fixed. Driver filled up and fuel clogged the filters. Not saying this is the problem with your truck.

I would take it to another Cummins dealer. Some new mechanic only can fix problems when the "Check Engine Lite" is on and their repair manual tells them what's wrong.