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Power Strokes
6.0 Tech
Surging turbo
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[QUOTE="KCTurbos, post: 979135, member: 13852"] I am unsure of what to tell you at this point. It gets really hard to diagnose this stuff sometimes through the forums. I know exactly what you are talking about. I had it do it on my truck before. It was weird because I could tell it was doing it just by the sound of the turbo while cruising even with the cruise control on at 65mph on flat ground. I could hear the whistle in the exhaust note kept changing and when I looked over at boost I could see it going up and down slightly... Then i did a complete overhaul with new sensors, new turbos, new injectors, etc... and the problem went away. I never really found out what was happening. There is a slight chance that there is slop in the unison ring and vanes. This would cause the computer to command the vgt to a certain point... but because of the slop it would be slightly off and the ebp/map would read high/low so the computer would compensate by adjusting the vanes... but then the slop would go back the other way and reverse the problem. That is the only thing mechanically I can think of... other than that I would think it would be a sensor malfunctioning somehow [/QUOTE]
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