Turbo problems

[Rawze]

(05-04-2017 )Mikesuburban1 Wrote:  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

In that case, i will re-phrase my suggestions..

* Pressurize the engine and look for leaks - USING BLOCKING PLATES AT THE INTAKE AND EXHAUST WHILE IT IS OFF!

* clean out the EGR, Delta-P, and other piping and verify the EGR valve is not sticking. -- sounds like you did this, also check the crossover tubes for Delta-P.

* replace the Delta-P sensor if it is old, I don't care what someone says!.

* 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.


* Check the "engine state" parameter to see if it is in a derate while it is acting up.

* Check the fuel pressure and make sure it is not starving for fuel at high torque.


Just some places to start.
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There, that is better.