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Resolved Fuel Pump kills the car

Posted by sleeper1ga, Aug 10, 2017

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  1. sleeper1ga

    sleeper1ga Proven Member

    98
    11
    Joined Oct 4, 2014
    Chicago, Illinois
    When cold the car doesn't seem to mind much about turning the fuel pump on, however once I drive the car for a few minutes it doesn't want to idle with the fuel pump on- it will surge and cause a rough idle- if I turn off the car then it wont run with the fuel pump on unless pedalling it... however if I start the car without the fuel pump and let it run it idles beautiful and doesn't have a problem...

    Suggestions?

    Car is a gvr4 v3 speed density
    Engine:.020" wiseco pistons 8.5:1, std. eagle rods
    Fuel: 1450cc FIC Bluemax Injectors, AEM 380lph External Pump
    Turbo: Godspeed 20g
     

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    My DSM:
    1992 Mitsubishi Galant VR-4

    Street Build

    20g   manual
    1990 Eagle Talon TSi AWD

    Street Build

      automatic
    1990 Eagle Talon TSi AWD (sold)

      manual
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  2. A Sharp

    A Sharp Proven Member

    151
    9
    Joined Nov 18, 2013
    Platteville, Wisconsin
    I'm guessing you are turning the inline pump on and off, while the in-tank walbro is always on. Does your fuel pressure jump way up when you turn the inline pump on?

    EDIT: do you have a wideband (you really should)? If so, what is that reading with the pump on?
     
    My DSM:
    1995 Eagle Talon TSi

    Street Build

    16g   manual
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  3. sleeper1ga

    sleeper1ga Proven Member

    98
    11
    Joined Oct 4, 2014
    Chicago, Illinois
    Went to a fuel cell so it's my only pump, I do have a wideband and when it's surging it varies a good amount
     
    My DSM:
    1992 Mitsubishi Galant VR-4

    Street Build

    20g   manual
    1990 Eagle Talon TSi AWD

    Street Build

      automatic
    1990 Eagle Talon TSi AWD (sold)

      manual
    Loading...
  4. gsxeclipse102

    gsxeclipse102 Proven Member

    482
    105
    Joined Mar 8, 2003
    carmel, New York
    If its your only pump and your turning it off how is the car running?
     
    My DSM:
    1991 Eagle Talon TSi AWD

    Street Build

    GT35   manual
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  5. sleeper1ga

    sleeper1ga Proven Member

    98
    11
    Joined Oct 4, 2014
    Chicago, Illinois
    It can run off the fuel in the lines, at idle you don't burn through gas quickly... pretty sure it's my iac motor just was looking for a second opinion... coils were good but it doesn't move as much as I thought it should so ordered a new one, and hopefully that will solve the problem...
     
    My DSM:
    1992 Mitsubishi Galant VR-4

    Street Build

    20g   manual
    1990 Eagle Talon TSi AWD

    Street Build

      automatic
    1990 Eagle Talon TSi AWD (sold)

      manual
    Loading...
  6. sleeper1ga

    sleeper1ga Proven Member

    98
    11
    Joined Oct 4, 2014
    Chicago, Illinois
    Iac did help stablize my isc position some, but still is surging... here's a log of while hot w/pump on
     

    Attached Files:

    My DSM:
    1992 Mitsubishi Galant VR-4

    Street Build

    20g   manual
    1990 Eagle Talon TSi AWD

    Street Build

      automatic
    1990 Eagle Talon TSi AWD (sold)

      manual
    Loading...
  7. sleeper1ga

    sleeper1ga Proven Member

    98
    11
    Joined Oct 4, 2014
    Chicago, Illinois
    Well it runs much better now, the stock 1g base timing map was too aggressive around the idle area, once I smoothed/retarded the idle range of the timing map it idled great, the surge was just caused by an aggressive timing advance, thanks to dmertz on the ecmtuning forum I was reminded of this... dealt with it on a formula car last year and just forgot about it.... but now it'll be remembered, anyways for my first time tuning on my own I'm not doing too shabby...
     
    My DSM:
    1992 Mitsubishi Galant VR-4

    Street Build

    20g   manual
    1990 Eagle Talon TSi AWD

    Street Build

      automatic
    1990 Eagle Talon TSi AWD (sold)

      manual
    Loading...

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