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2004 f350: neutral..throttle..turbo low boost..position sensor…

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2004 f350 diesel 6.0 ///...
2004 f350 diesel 6.0 /// @ 2200 rpm in neutral sound great,, until you let off the throttle,, then it sound like you have hit a Jake Brake on an 18 wheeler ,, and the sound comes through the air intake box where the filter is. We have checked the turbo,, Looks great !!! we have checked and replaced the waste gate, this did not fix the issue,,  cheched for leaks around pipe couplings,,none were found;;,  when we remove the turbo from the intake the truck runs perfect @ high idle or low idle.  Codes pulled were exhaust relief valve high,,, turbo low boost,,, egr valve,, and the cam shaft position sensor.  We really don't want to start replacing random parts,, would love to replace one part for a fix.  Can someone please help.
Submitted: 8 years ago.Category: Ford
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Answered in 1 hour by:
6/16/2010
Ford Mechanic: Steve S, Ford Technician replied 8 years ago
Steve S
Steve S, Ford Technician
Category: Ford
Satisfied Customers: 1,867
Experience: 10 years in Ford Dealership, Certified in: Auto Trans, Diesel Engines, Climate Control, Electrical D
Verified
Hi there. Have you removed the Egr valve and looked at it? You have a code for Exhaust backpressure sensor correct>? Can I have your VIN to see if the truck has the latest pcm calibration installed?
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