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2G Choppy idle on first start up

Posted by eclipsemf, Sep 16, 2019

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  1. eclipsemf

    eclipsemf Proven Member

    212
    2
    Joined Jun 10, 2010
    Glen, New Hampshire
    I just got done getting my 2g gsx ready for inspection, Replaced o2 sensors, did new hard IC pipe, fixed an exhaust leak and rebuilt the 14b on the car, Nothing else has changed with it and only had bolt ons right now. I drove it 200ish miles after all of this was done with no issues, now when I start the car for the first time in the morning it stumbles at idle dropping to as low as 200rpm and is running super lean on the wideband so lean it just shows ---. Once I put it in gear and drive just enough to get it in to 2nd its fine and goes away for the rest of the day and runs great. I have done a Boost leak test and thats good and it wont even throw a check engine light, turbo is still great.

    I just cant seem to figure it out and its just getting super annoying. I do have a basic scan tool I can pull some info from if any of it will help. Any advice or thoughts are wlcome ill try anything at this point. Car has just over 100k on it.

    Thanks
     

    633  0

    1997 Mitsubishi Eclipse GSX
    · 2G DSM
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  2. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Hoover, Alabama
    So this only happens when it's cold? If you start it and the temperature is warm then it's fine?
     

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  3. eclipsemf

    eclipsemf Proven Member

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    Joined Jun 10, 2010
    Glen, New Hampshire

    Cold as in only if the car hasnt been started that day, outside temperature doesnt seem to have an affect on it yet. Once I drive it during the day and come back out to drive it its fine
     

    633  0

    1997 Mitsubishi Eclipse GSX
    · 2G DSM
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  4. BLACK'98DSM

    BLACK'98DSM Proven Member

    631
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    Hoover, Alabama
    Yes, I was referring to the engine temp, not the climate LOL
     

    Road Race Build 2K  15

    1998 Mitsubishi Eclipse N/T
    fwd · manual · 2G DSM

    292  3

    2012 Murray Explorer Dune
    rwd · automatic · Misc Vehicles

    204  6

    2009 Troy Bilt Bronco
    rwd · automatic · Misc Vehicles
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  5. eclipsemf

    eclipsemf Proven Member

    212
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    Joined Jun 10, 2010
    Glen, New Hampshire
    Im from New England so temps can be 20 at night and get in to the 70s during the day right now so wanted to make sure that was clear LOL
     

    633  0

    1997 Mitsubishi Eclipse GSX
    · 2G DSM
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    BLACK'98DSM likes this.
  6. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

    4,243
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    Joined Nov 14, 2013
    Independence, Kansas
    Fuel pressure coming right up as soon as the car starts?
     

    Street Build 3K  27

    1992 Eagle Talon TSi AWD
    awd · automatic · 1G DSM

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    awd · manual · 1G DSM

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    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
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  7. Vegas smith

    Vegas smith Proven Member

    2,637
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    Joined Dec 2, 2002
    Houston, Texas
    Check for a check engine light (pun intended) and report back. I wonder if you have an FIAV air leak. Sometimes an FIAV can cause a vacuum leak at certain temps. Is yours blocked or modified?
     

    Street Build 3K  10

    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  8. eclipsemf

    eclipsemf Proven Member

    212
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    Joined Jun 10, 2010
    Glen, New Hampshire

    I have to check on the fuel pressure, that actually kinda seem like the issue, If I rev it around 2000 rpm its usually come out of it then once driving its gone, ill have to check that when i head to the post office later.

    Also no check engine light I have driven it about 250 miles so if it was major something should have thrown already. As for the FIAV everything there is stock and untouched
     

    633  0

    1997 Mitsubishi Eclipse GSX
    · 2G DSM
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  9. eclipsemf

    eclipsemf Proven Member

    212
    2
    Joined Jun 10, 2010
    Glen, New Hampshire
    Also with the fuel pressure this car sits all winter so there is a chance it could be a leaky injector allowing some air to get in to the fuel lines that would cause the hesitation until it all clears out
     

    633  0

    1997 Mitsubishi Eclipse GSX
    · 2G DSM
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  10. eclipsemf

    eclipsemf Proven Member

    212
    2
    Joined Jun 10, 2010
    Glen, New Hampshire
    Just finishing this off here. I finally got a check engine light to come on after about 600 miles of this! Turns out it was the upstream o2 sensor was being a little funky. Should have the new on here in a day or 2 and will be good to go!
     

    633  0

    1997 Mitsubishi Eclipse GSX
    · 2G DSM
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