Question about 2000 Pontiac Grand Prix

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Just moved from New Mexico to Florida and the gas mileage in my 2000 Grand Prix and dropped to about 10 to 12 mpg. Is it the change in elevation?

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  • cindy_irwin Jun 26, 2009

    Thats what I had thought but everyone told me the computer should adjust. What did you do to solve the problem?



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I just dealt with a similar issue.I moved from Florida to Missouri and yes there is a difference from elevation and the humidity in the air and gas mileage.

Posted on Jun 26, 2009


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1 Answer

Drop in gas milage with drop in altitude

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Still a big drop in mpg

If you ever moved, you may need your computer software
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I would guess the MAF Sensor was out of it's range

Check to see if any codes were stored
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Could my MAP sensor be faulty? My gas mileage has gone down to 10 mpg since I moved to Florida?

replace air filter .change spark plugs and wires.transmission slipping .check tranny fluid.if you got manual transmission.clutch could be slipping.low tire pressure.brake could be dragging.high speed driving and a lot short runs.stopping and going burn a lot of gas.scan it to check oxygen will cause fuel consumption.

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I'm not sure I have a solution to this but the change in altitude should cause a change in mpg. However, the car was not put in a box and shipped there, it was driven...and should have adjusted gradually to the change. (computer should re-calibrate). The only item that may be affected would be the map sensor. Possibly, since it has always worked at one altitude, it may have worn in that area and is hanging up and unable to adjust.
If the trip was made quickly, the computer may not have re-calibrated itself yet (depending upon how long it's been in Alaska) You may want to try disconnecting the battery and then re-connecting it, or it may need to be manually re-calibrated using a scan tool. The computer likely is working properly though otherwise with that kind of mpg you should be blowing a bit of black smoke out the back. Only other thing I can think of is to check the air filter to make sure it's clean and not restricted.
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While changing all the filters and things, did you change the fuel filter? It could have just been poor quality fuel which can be caused by getting fuel from the bottom of the barrel so to say. If the station you got the gas at was getting low there is a chance that there was water in the fuel. Normally this would cause the vehicle to run a little bit rough, but not always. I would run another tank of fuel through it and see what you get on a second tank.

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