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Message:: [QUOTE="highside, post: 3060533, member: 38745"]The pyrometer sensor that was left out after your turbo was installed is only there to run the gauge. The ECM does not use it. It is a useful gauge to have, but it is not absolutely necessary. Your low boost problem could be caused by a number of things - from a leaky after cooler, to a bad sensor. Without being able to actually lay hands on the truck, all I can do is guess. Guessing gets expensive. You could even have a plugged muffler causing a derate due to excessive exhaust backpressure. If you have your EGR unplugged, that could be part of the problem. There have been reports of ISX's going into silent derate when the EGR is unplugged. I'm a big fan of the EGR deletes, along with removing the components and blocking everything off. The EGR valves can work their way open, and blocking everything off is the only sure way to make sure the EGR is completely disabled. On a side note, when you ask Cummins what could be wrong, they're assuming you have a functioning emission system. When you unplug/delete the emission system, you have to take that into consideration with your troubleshooting, as the dynamics are changed. Your low fuel pressure could be one of the two pressure regulators in the fuel housing, it could be your gear pump, or even air in the fuel. I do not think the actuators would cause low fuel pressure. Again, all I can do is guess.[/QUOTE]