Join Date: Jun 2008
Location: Brampton, Ontario, Canada
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VGT = Variable Geometry Turbine
The only way to diagnose this concern, is to have Ford's IDS diagnostic scan tool connected, while monitoring VGT duty cycle, RPM, EBP (exhaust back pressure), MGP (manifold gauge pressure) and MAP (manifold absolute pressure) under the condition in which it occurs.
With that said, short of removing the turbo and having a look inside at the turbo vanes and unison ring (which I DO NOT recommend if you are inexperienced), you are better off just driving VERY cautiously until you can bring it in.
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Ford Diesel/Senior/Master Tech who placed 2nd overall in Ontario on the Fix-It-Right-First-Visit score for 2010
....who works at a dealership that now employs SOME half decent looking female employees since they overhauled most of the administrative staff
....but STILL loves hot women with big boobies
....and STILL hates working on E-Series with 6.0L