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99 GSX air/fuel ratio tuning

Posted by Meark, Mar 15, 2019

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  1. Meark

    Meark Proven Member

    44
    3
    Joined Nov 25, 2016
    gastonia, North Carolina
    Okay so I have a 1999 Mitsubishi eclipse gsx, it has a 95 computer with a ecm tuning chip (like that when I got the car).
    Right now everything mechanically and electrically seems good. But my air to fuel ratio is all over the place (has a gauge).
    Right now it's hard to start, and it has NO power.
    Will a simple tune fix this? If so how.
    I do have the cable to hook the car to my laptop and the ecmtuning software downloaded.
     

    Street Build 205  6

    1999 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  2. Vegas smith

    Vegas smith Proven Member

    2,716
    1,290
    Joined Dec 2, 2002
    Houston, Texas
    It's impossible to say given how little we know about the car. Hook your laptop up to the car and get a log of the car idling while warmed up and post that. Also make a profile listing all mods to the car.
     

    Street Build 3K  10

    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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    1990TSIAWDTALON likes this.
  3. GPLaserRS

    GPLaserRS Proven Member

    229
    25
    Joined Aug 23, 2005
    Grosse Pointe, Michigan
    What brand AFR gauge is it and is it a wideband?
     

    Street Build 639  4

    1992 Plymouth Laser RS Turbo AWD
    manual · 1G DSM
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  4. pauleyman

    pauleyman DSM Wiseman

    5,146
    1,007
    Joined Nov 19, 2011
    oklahoma city, Oklahoma
    You do understand that at idle and cruise air fuel is supposed to go all over the place? It is the nature of closed loop. Only at WOT will you see it steady out. You need to log the car.
     

    Street Build 3K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  5. Meark

    Meark Proven Member

    44
    3
    Joined Nov 25, 2016
    gastonia, North Carolina
    AEM, wideband.
     

    Street Build 205  6

    1999 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  6. Meark

    Meark Proven Member

    44
    3
    Joined Nov 25, 2016
    gastonia, North Carolina
    How exactly do I log it.
     

    Street Build 205  6

    1999 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  7. pauleyman

    pauleyman DSM Wiseman

    5,146
    1,007
    Joined Nov 19, 2011
    oklahoma city, Oklahoma

    Street Build 3K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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