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04-17-2017, 05:21 PM
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Registered User
Join Date: Apr 2017
Location: CO
Posts: 58
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possible turbo going out?
My parents have a 2002 GMC 3500 with the duramax. At highway speeds theres a rather high pitched whine that changes with how much your pressing on the throttle. It doesn't seem to make any boost till it hits about 2000rpm either but I can't confirm that as there isn't a boost gauge yet. The oil pressure seems unusually high as well around 70-75psi when cold. It does have 249k miles on it.
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