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I have 2003 f250 6.0, had the turbo rebuilt and I put it back in, my turbo is whistling but I'm also getting a humming noise kinda sounds like a when u down shift at high rpm's idk what's going on, I try and power break as well to build up boost and the tires do not even spin...Any suggestions
Humming may be a harmonic from the exhaust tubes being stressed from poor alignment to the turbo. Whistle can be a poor connection of the boots on the pressure side. Low boost, low power.