Thread: 12-14 mpg

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  1. #1 12-14 mpg 
    GTX Level Member Toofastgs's Avatar
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    What the hell gives?

    Plugs are new (104s)
    Oil not that old will change this weekend
    Fuel filter 6months old. Will change this weekend as long with PVC
    Tires at 34cpsi what is recommended is 30cpsi
    My foot is not in the gas.
    Now a few months ago i did remove my thermostat to help keep car cool but it did not affect the mpg I will add before i leave today.

    This just started yesterday out of the blue.

    PS. I do not run any gas with eth in it.
    00' GTP 350/420 - Retired
    98' GS - Sold
    Current - Lexus ES300
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  2. #2 Re: 12-14 mpg 
    GXP Level Member Zef_66's Avatar
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    Quote Originally Posted by Toofastgs View Post
    What the hell gives?

    Plugs are new (104s)
    Oil not that old will change this weekend
    Fuel filter 6months old. Will change this weekend as long with PVC
    Tires at 34cpsi what is recommended is 30cpsi
    My foot is not in the gas.
    Now a few months ago i did remove my thermostat to help keep car cool but it did not affect the mpg I will add before i leave today.

    This just started yesterday out of the blue.

    PS. I do not run any gas with eth in it.
    Start by putting that t-stat back in. Taking that out can only cause you trouble.

    Also, make sure you are running a stock t-stat if you are concerned at all about mileage.

    Start there. But also consider plug wires and O2 sensor.
    2001 GSE
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  3. #3 Re: 12-14 mpg 
    GTX Level Member a98gtp4u's Avatar
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    what mods do u have?
    3.4 pulley, 3" catless dp (ubend deleted), 3" exhaust split to 2.5 dynomax mufflers (no res), zzp plog, 4" spectre intake, alt rewire, under/overdrive pulleys, intense pcm, 3/4" zzp tb spacer, al 104's, 180* stat, msd coils/8.5mm wires, heatwrapped crossover, flipped db's, optima red top, sunpro st boost gauge: boosting 11lbs.
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  4. #4 Re: 12-14 mpg 
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    Why did you remove the T-stat?

    Put it back in. The engine is designed to make its best power and fuel mileage, once it has gotten to the proper running temp. Your car now is not getting into open loop and stuck in closed loop. I always get them confused, open and closed, but either way your car is not getting to the one and stuck in the other. Computer controlled cars need to get to temp, not like cars years ago that were not computer controlled.

    A couple other things are, change your oil and check your air filter.
    Last edited by toolguy; 10-28-2009 at 12:25 PM.
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  5. #5 Re: 12-14 mpg 
    GTX Level Member Toofastgs's Avatar
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    Well i just put the tstat back in. Went a head and did fuel and pcv while i was at it.

    I forgot how to tell if pcv is bad, but the fuel when i took it off and blew threw it it was hard and some black colored gas came out :-/

    So well see what happens.
    00' GTP 350/420 - Retired
    98' GS - Sold
    Current - Lexus ES300
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  6. #6 Re: 12-14 mpg 
    Needs A Turbo BoostJunki3's Avatar
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    Quote Originally Posted by Toofastgs View Post
    Well i just put the tstat back in. Went a head and did fuel and pcv while i was at it.

    I forgot how to tell if pcv is bad, but the fuel when i took it off and blew threw it it was hard and some black colored gas came out :-/

    So well see what happens.
    if your pvc is bad ..with the oil cap off place your hand over the hole if it sucks your hand then the pvc is ****....

    00 Silvermist GTP
    E85|GenV|3.2|#65's|1.95 YT RR w/105's|Pacesetters|N*/LQ4|PRJ rewire/255lph
    13.2 @ 104. No Cam No IC.
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