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Re: Drone go away please help
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If aftermarket exhaust fixes it why don't Ford pay for it.
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Because that is not Ford's fix although they know it helps because an aftermarket exhaust re-tunes the system. I believe the problem started when a change was made to the turbo pedestal and the mentioned TSB addresses the issue. Sometimes you can affect a drone by simply loosening all of the exhaust clamps enough to allow them to move, drive the truck and get the system hot and then shut it down. After it cools, re tighten all clamps and fasteners from front to back. That method of "neutralizing" the system does not always work however, but it's worth a try.
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Ford Master Diesel Technician 
Diesel Technician Society
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