I have a 2008 LEU 613 with the MP7 engine. It hesitates when building boost. You have to throttle at 100%. It builds to 10psi. It will buck a few times when boost goes to 15 or 20 psi. It may fall back to 10 psi, then all of a sudden it will build full boost and go. There are no codes. I replaced EGR. It does have a whistling noise coming from that aggravating pipe at the EGR cooler. Replaced it a couple times already. About two months earlier, I had to replace the EGR cooler, loosing coolant excessively into exhaust. Also replaced the turbo at the same time. There is one thing I noticed, the inlet exhaust temp stays at 32 degrees. I unhooked the exhaust pipe at the muffler. As soon as I did that, it took off like it's suppose to for about 200 feet. I stopped to try again and it was back to same way.....the soot level in DPF is at 65%....Any ideas?
