Bad VGT Control Valve symptoms - Ford Powerstroke Diesel Forum
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Old 07-05-2011, 05:40 AM
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Bad VGT Control Valve symptoms

Diesel mechanic suggested I might have a VGT Control Valve going bad or it is already shot. At highway speeds at 2,100 to about 2,300 rpms under loads such as over passes and long grades towing a 3,500 lb. boat, it sounds as if the turbo is dumping boost...like waste gates do, Makes a <<chew, or chew chew chew>> noise and is felt as minor bucking or momentary loss of power. No problems off the line or anytime while heavy on the accelerator. If the VGT Control Valve was bad, what would the symptoms be? Anyone else ever have an issue such as this?
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Old 10-18-2011, 08:31 PM
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My '05 has the exact same symptoms under the same circumstances. I have been suspecting a bad valve for a couple days now. Interesting to hear if anyone else has had this issue and what was done to correct
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Old 10-18-2011, 08:36 PM
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It certainly sounds like you are losing boost somewhere along the line. Just to be clear, you can not repeat the same effect using the exact same boost pressure and RPMs under other conditions? It would seem that you should be able to duplicate the effect without pulling anything just by matching the boost pressure and RPMs if the VGT control valve were the problem.
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Old 10-18-2011, 09:17 PM
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I have had the same symptoms empty going over the mountain pass. It doesn't happen all the time, but have noticed that it happens when the truck is working harder and at 18-20 lbs boost. Cant ever recall it doing it at normal cruising speed under normal load. It will go away if the motor kicks down to a lower gear and boost goes up higher.

Last edited by joker1271; 10-18-2011 at 09:25 PM.
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Old 10-19-2011, 04:10 AM
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I had my problem check out by a very good 6.0 mechanic. The problem was a "frozen" unison ring which controls the pitch of the vanes in the turbine. If the vanes do not get actuated through out their entire travel range frequently they can become rusted or froze in a particular position. Had him go through the turbo, no wear damage at all. I believe there is a lubricate that they apply to the sliding surfaces that is supposed to help prevent this in the future. The best way to keep this from happening is frequent use and periodically running it hard to fully actuate the turbo vanes.
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Old 10-19-2011, 05:04 AM
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Had the same problem in 08 with my 05. Dealer rebuilt the turbo and told me it was because the truck sits too much. I use it mainly to pull my fifthwheel. The VGT turbos are very suseptible to freeze up if they aren't run regular and farily agreesively now and again to keep the tiny rust particles and soot from building up.
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