While our truck was already in for service at Thayer, we decided to ask for an in-depth checkout of all of the engine, cooling and drivetrain components. The technician is a Duramax diesel owner and fellow RV’er, so he knows the engine and the lifestyle. He found the probable cause of the failure of the turbocharging system! When the new parts were installed on the engine, he connected up his electronics and took the truck out for a test drive before calling us to pick it up. The tests quickly indicated that the air/fuel ratio was not correct, not even close. So he brought the truck back in and found a fairly large crack in the back/underside of the “Airbox”, and that has its own air filter, the crack was after the filtering thus allowing more air in then should be. It is unclear when the crack occurred, but it was definitely broken and has to be repaired.
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