2001 Chevrolet Express Logo
Posted on Jul 17, 2010
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2009 chevy express van 6.0 gas 1 ton. It runs perfect until you climb above 7000-plus feet then in starts losing power and eventually stops running. It will start after cooling down climbs a little further stalls again. after decending to below 7000 ft it resumes normal driving? took to dealer it shows no codes. Many blogs report same problems all the way back to 2003 models. Help I work in Colorado and cant drive across mountain passes.

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  • Posted on Jul 17, 2010
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I read about this in popular mechanics, because of the thinning air the map sensor doesn't read enough vacuum and leans the fuel mixture back, one of the solutions is to run higher octane fuel, try contacting popular mechanics automotive dept, to see if there is any other cure
hope this helps

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