Ok 2006 6.0 fresh rebuild. Drove 4-5 days everything was fine come out one morning started truck it had a wooing air noise that gets louder with throttle and little to no boost 1-2 pounds at 2000rpm. Took turbo off found some bad fins on turbine wheel so I rebuilt turbo, new wheels, veins, unison rings the whole 9yards. Put it back on still the same problem. Little to no boost wooing noise that builds under throttle. Pressurized cold side found no leaks there. Changed map sensor and cleaned ebp sensor Still nothing. truck starts good and sounds great aside from the wooing sound and almost no boost. Can hear turbo veins cycling as change in the exhaust sound. Any ideas?
Im pretty sure i know what noise youre talking about. If we're talking about the same noise, that is what they sound like with the veins open. So either they are suck open or it's being commanded to open.
So aside from the Vgt being bad what would be commanding it to stay open. I did see earlier as I was surfing threw posts that if the vgt was bad it defaulted to a fully open position, is that correct?
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I'm not sure, I've never really seen that though. The solenoids I've seen go bad just sort of stick wherever they feel like. Anyway, a few things could cause a full command of the vgt. Super high exhaust pressure or a faulty pressure sensor. Super high manifold pressure or a faulty map sensor. A faulty pcm or bad firmware/ bad tunes. A short on the negative side of the solenoid could also cause this. Probably some more that I missed.
I doubt it's a command issue but that's easy enough to check with a scanner or a multimeter of the meter will read duty cycle. Most meters nowadays do.
I can't get any codes to show up. I did clean the ebp tube before the engine went back it. The truck only has about 200 miles on it since rebuild. I could of got the sensor wet when I pulled the degas bottle back off due to 2 of the ficm plugs not being totally plugged in. I have another sensor I'll change it out and look at the wires.