H1 with Duramax Runs rough on and off

H1 (Hummer) & HMMWV Specific Information

H1 with Duramax Runs rough on and off

Postby Dbdelight » Sat Sep 03, 2016 2:44 pm

Have a low mile H1 with a Duramax, it will run fine then won't hardly run, can't get over 40 mph. Was low on fuel just filled it up. Had fuel filter changed 400 miles back.
When it starts running bad dumps black smoke
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Re: H1 with Duramax Runs rough on and off

Postby Ian Ward » Sun Sep 04, 2016 10:41 pm

The forum message boars takes a bit to refresh postings.
From your very limited explanation of the issue this sounds electrical to me. get the truck scanned and post your trouble codes and we may be able to help. If it runs fine sometimes it probably is not a fuel delivery issue. Where are you located?


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