Turbo problem
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Freshman User
Joined: Feb 2011
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Turbo problem
I have a 05 f250 not making much boost 13 psi at full throttle. It is not the cat because it is straight piped. I cleaned the turbo and the unison ring moved freely. It will get really hot 1250+ really fast. My truck has been studded and egr is deleted.i was looking at the vgt% it is almost always 15-18% wile driving down the road no matter what. I unplugged the Vgt solenoid and it jumped to 85%.
Posting Guru
Joined: Feb 2009
Posts: 1,170
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From: Moyock, NC
You never want 15% or 85% while under throttle (sure 85% is okay while idling if you have a zero restriction exhaust....but thats it).
You either have a VGT that is commanded closed or open, but without variation.
If you cleaned it and the unison ring and vanes were free moving, then I'd say you have a failed VGT valve. Have you checked the VGT electrical connection?
You either have a VGT that is commanded closed or open, but without variation.
If you cleaned it and the unison ring and vanes were free moving, then I'd say you have a failed VGT valve. Have you checked the VGT electrical connection?
Logistics Pro
Joined: Dec 2004
Posts: 4,138
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From: South Weber, Utah
What are the MAP, BARO and EBP sensors reading at KOEO? They should all be within .5 PSI of one another. You can do some house cleaning and pull the MAP sensor hose and blow the hose out and the nipple at the intake to make sure they are clear, the map sensor is located just above the evaporator housing on the passenger side and is connected to the passenger side of the intake via a rubber hose. Next pull the EBP sensor and run a piece of weed whacker line through the tube that connects the EBP sensor to the drivers side exhaust manifold, the EBP sensor will be located just below the FICM and is connected to the drivers side exhaust manifold via a steel tube. With the VGT being commanded to 15% it is trying to get the boost up and is not getting the expected response from the MAP or EBP sensor. You can try unplugging the EBP sensor while it is running and see if you get a change in the tone of the engine.
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