Thread: miles per gallon?

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  1. #1 miles per gallon? 
    GT Level Member backinblackgtp's Avatar
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    since i have bought the this gtp in late October i have been getting an between 13- 15 mpg city driving, i have minimal mods, and i don't have a heavy foot. Is there something that should be replaced that's causing this? 45 dollars a week driving only 130 miles is alot. thanks in advance
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  2. #2 Re: miles per gallon? 
    donated to get this wow TorqueAutoMotiv's Avatar
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    thats not good with all my mods and a mildly heavy foot im getting 16-17 city right now with a cam code

    maybe time to change out the front o2 sensor fuel filter maybe swapping out plugs depending on how old they are maybe
    How many miles are on your car

    98 gtp sedan forest green ,S1X intense cam,Intense pcm,Magnaflow exhaust, ubend delete,TEP trans 3.29's,3.4 smoothflow mps,Dyno'd 281hp and 371ft #'s of trq at the wheels
    http://www.cardomain.com/ride/3338681
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  3. #3 Re: miles per gallon? 
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    bone stock 04 high 20's city driving 30+ on the freeway,normal driving. After chipping out 4 pistons mileage dropped off to 15ish.
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  4. #4 Re: miles per gallon? 
    GTX Level Member a98gtp4u's Avatar
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    i get 16 city and 27-29 highway with all my mods.
    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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  5. #5 Re: miles per gallon? 
    GPF Mr. President nawarkk's Avatar
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    I get normal 18 city and 23-25 highway..
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  6. #6 Re: miles per gallon? 
    DUI BABY Bio248's Avatar
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    are you getting any codes? the front o2 sensor might be dying.
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  7. #7 Re: miles per gallon? 
    GTP Level Member 2000GTP's Avatar
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    Quote Originally Posted by Bio248 View Post
    are you getting any codes? the front o2 sensor might be dying.
    he lives right near me. he was getting codes for the rear 02. but his SES light is off now. I was thinking the front could be on the way out
    2000 GP GTP Black 2 Door AEM Meth Injection (100% Meth), 3.25" pulley, N* TB, PRJ Wires, Smoothflow Idlers, 42# injectors, Racetronix fuel pump, ZZP Headers, 1.8 Roller Rockers, Custom CAI, NGK TR6 Plugs, 180* Tstat, Custom Tuning by TUNE TIME PERFORMANCE
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  8. #8 Re: miles per gallon? 
    GT Level Member backinblackgtp's Avatar
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    almost 86,000 miles, i just had a high flow cat and resonator put in a month ago, and i know before i bought the car, the carfax said the exhuast system was checked several different times but still, i dont think it could be that? so you all recommend new spark plugs, new front 02 sensor?
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  9. #9 Re: miles per gallon? 
    GTX Level Member cerick08GP's Avatar
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    Yup, plugs and the front O2 sensor are basically the only “tune up” stuff that needs to be regularly replaced on our engines. Each last about 100k, more or less. The only other item that could done is cleaning the MAF sensor.

    Ten years of continuous driving excitement and counting!
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  10. #10 Re: miles per gallon? 
    GT Level Member backinblackgtp's Avatar
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    well i know the MAF sensor has been replaced its not the original one, and the guy i bought it from said it was recently changed. so ill change the front 02 sensor and plugs, gonna be annoying rocking the engine forward for the rear plugs
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  11. #11 Re: miles per gallon? 
    donated to get this wow TorqueAutoMotiv's Avatar
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    Its not that bad
    Im going to be lazy and buy the engine moving tool
    its only 35 bucks at matco tools for students ya its lazy but id use it

    98 gtp sedan forest green ,S1X intense cam,Intense pcm,Magnaflow exhaust, ubend delete,TEP trans 3.29's,3.4 smoothflow mps,Dyno'd 281hp and 371ft #'s of trq at the wheels
    http://www.cardomain.com/ride/3338681
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  12. #12 Re: miles per gallon? 
    SE Level Member mikesarebetter's Avatar
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    having the right tool for the job is never lazy!!
    2003 GTP, pacesetter headers, colder plugs, zzp pcm for now, CAI, 3.5 pulley and 180tstat
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  13. #13 Re: miles per gallon? 
    donated to get this wow TorqueAutoMotiv's Avatar
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    Im actually ordering one when i get my next check i remember the first time i changed plugs i had my 1/2 drive rachet proping the engine forward not smart not safe but it worked

    98 gtp sedan forest green ,S1X intense cam,Intense pcm,Magnaflow exhaust, ubend delete,TEP trans 3.29's,3.4 smoothflow mps,Dyno'd 281hp and 371ft #'s of trq at the wheels
    http://www.cardomain.com/ride/3338681
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  14. #14 Re: miles per gallon? 
    I AM PEWPIN! rynoman03's Avatar
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    Rachet strap from the engine mount to the radiator support area works wonders too and costs less than 5 bux.
    1999 GTPHP Tuned, Ported SC/TB, 42#'s, SSAC's, ZZP Modded 1.9's/LS6 Springs/Manley's, TransGo Shift Kit, Poly Uppers, KYB GR2's/Springtech's. - 231k and traded it in. - Gone
    2000 GTP: XP, P&P'd Heads, N*\Lq4 MAF, GenV, 42#'s, PRJ Rails\FPR, Racetronix, TEP w/ 3.29 Gears, 300m, 7/8" chain, SSAC's. - Collecting dust in my garage.
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  15. #15 Re: miles per gallon? 
    donated to get this wow TorqueAutoMotiv's Avatar
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    theres a chance of bending something that way though i know its slim but still

    98 gtp sedan forest green ,S1X intense cam,Intense pcm,Magnaflow exhaust, ubend delete,TEP trans 3.29's,3.4 smoothflow mps,Dyno'd 281hp and 371ft #'s of trq at the wheels
    http://www.cardomain.com/ride/3338681
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  16. #16 Re: miles per gallon? 
    GT Level Member backinblackgtp's Avatar
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    ill probably have it done at a shop, don't need any more problems with my car than i already have.
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  17. #17 Re: miles per gallon? 
    The Blue One blueguy's Avatar
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    Be a man...change the damned plugs.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
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    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  18. #18 Re: miles per gallon? 
    GXP Level Member BwolfGT's Avatar
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    Mine's been doing the same thing for awhile now, finally threw a code for a bad cat the other day. I'd try that and the o2 sensor, and some injector cleaner.
    1998 GP GT - Topswap - Ported M90 - N* - 4" FWI - Poly Mounts - 3" DP - 180 Tstat - Alt. Rewire - 3.29 gearing - Full Exhaust - Custom Tune
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  19. #19 Re: miles per gallon? 
    GT Level Member backinblackgtp's Avatar
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    yup thanks, just put the injector cleaner in about 2 weeks ago, and ordered the 02 sensor and plugs, really hoping its not something more serious....
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  20. #20 Re: miles per gallon? 
    i pay to play badbrad's Avatar
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    just ell us of the results, i'd like to hear what fixes it.
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