Join Date: Jun 2010
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I have a stock '05 6.0 with 260k and just about rebuilt (hopefully) everything that there is to rebuild over the last 3 years: EGR delete, air intake, Y pipe, radiator, all injectors, glow plugs, stand pipe, dummy plugs, EBP sensor, ICP sensor, IPR, turbo. I am sure I have missed something but hopefully you get the picture. I have a ScanGuage so can monitor whatever is needed. Last pieces to be replaced are the turbo and EBP sensor 2 weeks ago and I am now left with the following symptoms: I live at 8900' and drive down to work each day to 5000'. Up where I live everything looks and drives great - turbo spools up/down (max BST low 20's with no trailer), VGT cycles from 50% down to 15% at idle, EBP reads from 15-30's. Truck drives normal. When I get "downhill" VGT tends to stay in the 50-60's range and my boost stays at high teens minimum and spools up above 30 (I have seen 35) on the slightest of inclines. The truck doesn't feel like it has as much oomph as normal and struggles to keep to 75MPH. I go to work, let it sit all day then drive home - it drives and acts normal (at least the last couple of days) all the way home - cruises at 75MPH NP. I haven't looked at MAP or the barometric pressure readings but is feels/seems to me like something is not adjusting for the change in altitude? Can the MAP sensor exhibit these symptoms or can the BARO sensor mess things up? I might be completely off so any suggestions are welcome.