Question about 2003 Pontiac Grand Prix

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NOT GETTING GOOD GAS MILEAGE - 2003 Pontiac Grand Prix

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If you haven't had a recent tune up done, it should be done.
Change the plugs, maybe plug wires,
fuel filter
air filter, that should help a little.

Posted on Jul 31, 2009

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Here are a couple of different problems that will cause bad fuel mileage. first is air filter, still getting low mpg. then the pcv valve. clean fuel system. the cost of filter about $20 pcv was $12 and the fuel system cleaning and pcv is easy to do. when cleaning the fuel system,clean the injectors the fuel rail and the throttle body be sure that you have them change the oil or that you do it after they work on it. Notice whether the oil smelled like fuel then your engine needs platinum plugs for best spark they can run as much as $8 each.

Posted on Jul 31, 2009

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landsend
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SOURCE: Truck does not get good gas mileage

check your thermostat and the engine cooant sensor.

Posted on Mar 15, 2009

  • 7 Answers

SOURCE: not getting good gas mileage var has 50,000 on it

also, have the fuel filter replaced.

Posted on Feb 12, 2010

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