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2005 Chevrolet Express 1500 Question: Poor gas mileage



jaco, 5.3L V8, Mandan, ND, January 16, 2011, 14:15

What do I do to find out how to address the problem?

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  • Answer #1

    ZeeTech January 16, 2011, 17:00

    Get a diagnostic. A good tech will see why is the air-fuel mixture is rich when monitoring the live data.
    Could be a simple thing like a stuck open thermostat.


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