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Old 10-06-2022, 09:03 AM   #24
hatzie
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Join Date: Oct 2008
Location: Wentworth, NH
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Re: Duramax/Allison downshift?

Quote:
Originally Posted by 1976gmc20 View Post
Thanks. Last I heard she was just going to take it home and drive it. She's thinking about hooking up the gooseneck with a load of horses or something and go drive up the nearby eleven thousand foot mountain pass to see if she can replicate the symptoms.
Don't think I'd take a trailer full of live animals on a drive like that without a backup tow machine following me.

If she got a slug of bad fuel it's entirely possible to have strange symptoms from the PCM frantically modifying parameters to fix it.
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RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.
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