Turbo problems

[Mikesuburban1]

(05-04-2017 )Rawze Wrote:  * Pressurize the engine and look for leaks.

* clean out the EGR, Delta-P, and other piping and verify the EGR valve is not sticking.

* replace the Intake pressure sensor, Delta-P sensor, and exhaust pressure sensor if they are old.


* verify the turbo is calibrated properly.

* Never worked on a ISM. If the turbo controller is air driven like in the CM870's, make sure the pressure supply line is at full air pressure by checking it with a gauge.

Just some places to start.

Thanks for the advice. Egr is not sticking and egr tubes are clear. I have replaced all sensors except delta p sensor cummins shop says its reading normal. No boost leaks full boost on mechanical gauge is 37-40 psi but noticed sensor will only read 31.5psi sometimes and that boost sensor is new and clean. The truck only revs to 2100 rpm and full boost is not until 1600rpm then i have to shift its almost like the truck has no bottem end. I hear a manifold leak sound that sounds like its comming from the turbo. Like i said before cannot see any soot or smell exhaust that would indicate a exhaust leak