Thread: Out of the blue crappy gas mileage.

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  1. #1 Out of the blue crappy gas mileage. 
    GrandPrix Junkie Bluemagic's Avatar
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    Ok as of late my gas mileage has been dreadful. Like 11.1 mpg bad. So I'm looking for some guidance with this issue and maybe it connects to my other issues I'm having as well. I drive a 99 GTP. I have new plugs new wires new air filter somewhat new fuel filter.

    Usually I get like 14.7 in the city with is still crappy but it's the city so I amount it to that.

    Around the time my torque converter starting acting funny this started happening as well. I unplugged the maf and it didn't seem better but I didn't keep it unplugged for long.

    What else could it be? Also my fuel sender is bad. Is that the issue?

    Also I'm starting to think my torque converter isn't bad because my motor is shifted lower on the passenger side because of a failed motor mount.

    Any help will be greatly appreciated. Thanks guys.
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  2. #2 Re: Out of the blue crappy gas mileage. 
    Moderator dsmuts's Avatar
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    Exhaust leaks? Which plugs did you use? Any mods?
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  3. #3 Re: Out of the blue crappy gas mileage. 
    GrandPrix Junkie Bluemagic's Avatar
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    I'm thinking exhaust leak. Exhaust has been kinda raspy.

    104 plugs and 3.4 pulley with supporting mods.
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  4. #4 Re: Out of the blue crappy gas mileage. 
    Moderator dsmuts's Avatar
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    Headers?
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  5. #5 Re: Out of the blue crappy gas mileage. 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    I would be looking at what the car is saying, as in sensors.

    Though for some that is not always possible.

    SMGPFC Member #1
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  6. #6 Re: Out of the blue crappy gas mileage. 
    GrandPrix Junkie Bluemagic's Avatar
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    Yea I'm thinking a sensor is bad. I have the torque app. So maybe I can do some type diagnostic. What should I look at?
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