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NSSGTO · 06-29-2021, 02:59 PM

Which model Duramax? I have had that issue on LLY's and it is usually the relief valve. Replacing them seems to help for a short time. I have found shimming the original with a .040-.060 washer works well.

06-29-2021, 02:59 PM	#4
NSSGTO Junior Member Join Date: Feb 2010 Posts: 53 Likes: 9 Liked 24 Times in 17 Posts	Re: Duramax towing “engine reduce power” Which model Duramax? I have had that issue on LLY's and it is usually the relief valve. Replacing them seems to help for a short time. I have found shimming the original with a .040-.060 washer works well.