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Turbo Issues. PLEASE HELP!
So i welded the exhaust ends of my EGR cooler and re-installed everything. Ever since, I have had weird problems with the turbo. When i start the truck up, it sounds like a intermittant whine, than gradually fades away. When the engine is quickly reved there is a sqreech sound. If i let the truck idle for 5 minutes, the squeeling will come back, change tones, and fade away. I dont think the turbo is operating. When i pull the VGT plug, the sound changed a little bit. I lost my exhaust wooosh sound, it just sounds like a big V8 ideling. Here is what i have checked so far.
-Removed the turbo and cleaned vanes, housing, unisom ring, etc. Verified everything was ok.
-Removed VGT solenoid from a friends truck and installed, same outcome.
-Replaced EBP sensor and cleaned tube.
-Tested MAP sensor
-Tested plug at turbo all the way back to PCM and Ohmd out.
-Tested voltage to hot and pulse signal to ground on VGT plug
-Removed oil supply line from top of turbo, removed FICM relay and bump started to test oil flow, OK
-Replace IC elbows and tightened
-Replaced tube to MAP sensor and intake manifold.
-Removed Turbo SIX TIMES to verify everything was OK
-Triple checked for exhaust leaks
I am ready to shoot myself. Me and my shop full of techs can not figure this out! My trucks been down a week and i probably have 50 hours of labor trying to trouble shoot. the engine idles smooth, the only issues is the turbo. I know the turbo is ok? Any suggestions?