Just a quick up date on the low power and black smoke.
Cummins Pacific put my motorhome on their dyno this week.
The tech said the rig was blowing black smoke and he felt like it was down on power when he was pulling the RV into the bay.
Shut it off while he was hooking everything up including a date logger so he could document the dyno run.
Started the run on the dyno and took it up to 90% load. The data logger showed the turbo was putting out 42 lbs. of boost, and there was now no black smoke. Everything was performing just as it should.
I went to pickup our RV and asked if I could take it for a ride before we settled the bill. On this drive the RV was down on power and was blowing black smoke again. Took it back to Cummins Pacific and settled up on the bill.
Left there and now no black smoke and she is running as she should.
No one seems to be able to pin point what the problem is, I've asked if it could be an o2 sensor or a map sensor but was told no, that it would throw a code and the check engine light would light up.
Sorry to be so long winded, just very frustrated no one can fix our problem.
