Question about Chevrolet Impala

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I am contacting you for a friend who is trying to get better gas milage with his 2003 chevy impala. He changed the down stream and up stream oxyen sensors, Put in new plugs and wires ,changed gas and fuel filter. Put in new PC valve, air filter and the gas milage has not improved. He doesn't know what else he can do.

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3.4 19 city 29 hwy 3800 17 city 27 highway check hose to map sensor

Posted on Apr 01, 2011

  • honeymokey
    honeymokey Apr 01, 2011

    If it's a 3800 the sensor is over pcv valve and remember to replace o-ring around pcv valve. Some people leave it off and that will make it run poor.

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Make sure tire pressures are up (specs listed on drivers door label), consider synthetic oil, diff fluid add a good fuel system cleaner occasionally and avoid cheap gas.

Posted on Apr 01, 2011

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