2012 Kenworth T800 with Cummins isx15 cm2250. Had a problem with chuffing and boost going up and down at idle and of course rough idle as a result. Took actuator off the turbo and checked the actuator lever on the turbo and couldn't move it, so I removed the turbo, cleaned it and got lever moving freely. When reinstalled I lighted up the lever to the right and actuator gear to 22.5 degree mark. Reinstalled everything and truck ran great no issues, but it gave me actuator fault code. Had a buddy with insite come me to me and recalibrate the actuator and now it's having same issues as before, chuffing, boost up and down, rough idle. Has anyone ran into this before? I am thinking calibration recalibrated the actuator out of alignment...
Pull the exhaust pressure sensor out and make sure the tube feeding it isn't plugged, I usually blow through it with a blow nozzle. Not a bad idea to replace the sensor either, they do tend to bias over time.
Make sure you are doing the procedure correctly. On insite, its a 2 step process. you do the install procedure with the actuator plugged in but off the turbo, then the calibration procedure once installed on the turbo. Do not turn the keyswitch off between steps. For a 2250, the sector gear(turbo) should be rotates toward the compressor housing, the "install position" should be stamped on the turbo. Never move the actuator gear once the "install" procedure is started on insite. You will see the actuator gear rotate back in forth as it goes through the process(install procedure before bolting onto the turbo). Once it completes, when you bolt it onto the turbo, do your damnest not to rotate it when trying to line up on the sector gear of the turbo. Ensure sector gear has FULL travel across entire range before installing. The actuators also can be kind of junk. But, never had much luck bringing a turbo back to life if it was initially found with a binding sector gear. You can also use the hysteresis test on insite. another poster brought up the exhaust gas pressure sensor as well -- verify a correct reading key on engine off(ambient air pressure, not fluctuating) as well as the tube not blocked.
