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Thread: Poor Gas Mileage...

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  1. #1

    Poor Gas Mileage...

    well I have my car running great and the problem turned out to be clogged fuel injectors and alot of crud in the tank.

    I filled up, drove around for 100 miles and filled it back up to get my mileage and it took 6 gallons of gas, thats 16.6 MPG, not good at all.

    I am getting my "check engine light" every once in a while but it never stays on for more than a few seconds.

    My O2 sensor is new so I know thats not the problem.

    Any idea where to start? Coolant temp sensor maybe?
    If there isn't a Z or an X in the cars name I don't want it!

    1983 Datsun 280ZX
    1978 Datsun 280Z Turbo
    1990 Mitsubishi Galant GS-X

  2. #2

    Re: Poor Gas Mileage...

    Quote Originally Posted by MaineGSX
    Any idea where to start?
    simple. how about all the recomended maintenance for the car. did u do all that?

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  3. #3
    Yeah, new plugs, wires, filter, pcv, fuel pump, fuel filter, cleaned gas tank, O2 sensor, clenaed injectors, changed oil, coolant system flush....
    If there isn't a Z or an X in the cars name I don't want it!

    1983 Datsun 280ZX
    1978 Datsun 280Z Turbo
    1990 Mitsubishi Galant GS-X

  4. #4
    You are here entirely tooo much!! 4-G-rim's Avatar
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    07-20-2003
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    Orlando, FL
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    Could be possibly EGR related. You could replace the EGR valve..or just eliminate with a $14 blockoff plate. It could be a failing MAF sensor..but I haven't had one go bad on me or known anyone that has to be the cause of it. I am assuming it because the MAF sends signals to the ECU to help determine air/fuel mixture.

    1991 Galant VR4 1948/2000_________1996 Galant "S" 5 speed 2.4L turbo

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