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2G Top end sputter under heavy acceleration

Posted by LilRedSpyder, Aug 2, 2019

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  1. LilRedSpyder

    LilRedSpyder Probationary Member

    17
    2
    Joined May 2, 2019
    Livingston, Louisiana
    So I swapped my trans a while back and the car started missing bad. Since then I’ve replaced the following: spark plugs, fuel filter, fuel pump, maf & air filter(adapter-cone). Car has a new fuel tank and I’ve jow ran a cpl bottles of injector cleaner and use only 93 octane fuel. Checked all vacuum lines and checked that I’m not losing fire thru my wires anywhere that I can see in total darkness.
    It’s only sputtering on the upper end of my gears and under hard acceleration, if I lift off the pedal and ease into it she runs strong. I also bypassed my fuel pressure regulator temporarily to rule it out as the problem and nothing changed. Anyone had this problem or have any idea what could be causing it?? Any help is appreciated.
     

    Street Build 162  1

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM
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  2. Mello

    Mello Proven Member

    872
    190
    Joined Jul 4, 2003
    Albuquerque, New Mexico
    Start with the simple. What brand plugs & what's the gap?
     
  3. LilRedSpyder

    LilRedSpyder Probationary Member

    17
    2
    Joined May 2, 2019
    Livingston, Louisiana
    Ngk .40 I believe is what they’re factory gapped
     

    Street Build 162  1

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM
    Loading...
  4. Mello

    Mello Proven Member

    872
    190
    Joined Jul 4, 2003
    Albuquerque, New Mexico
    Turbo is smaller gap. Try gapping to .028" at the most & even smaller if you still have some missing. You want as big a gap as possible without misfires. Factory spec for turbos is .028"-.031".
     
    LilRedSpyder likes this.
  5. LilRedSpyder

    LilRedSpyder Probationary Member

    17
    2
    Joined May 2, 2019
    Livingston, Louisiana
    gapped to 028 and still doing the same thing. It does seem to be smoother on top end of pedal tho
     

    Street Build 162  1

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM
    Loading...
  6. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

    4,020
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    Joined Nov 14, 2013
    Independence, Kansas
    If your FPR is unhooked then it isn't rising with boost at a 1:1 ratio, did you hook it back up? If not the car is running lean in boost since it only see's base fuel pressure.
    Turbo cars run a rising FPR, so for every pound of boost, the fuel pressure increases the same amount in pounds of fuel pressure. 10 pounds of boost will raise the fuel pressure by 10 more pounds.
     

    294  17

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 409  4

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 3K  21

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

    Street Build 5K  11  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM

    4K  24

    1990 Eagle Talon TSi AWD
    13.612 @ 107.760 · 1G DSM
    Loading...
  7. Vegas smith

    Vegas smith Proven Member

    2,530
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    Joined Dec 2, 2002
    Houston, Texas
    Considering we know absolutely nothing about what parts are on the car, my guess is it's fuel cut or you're running out of fuel pump.
     

    Street Build 3K  10

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

    Mello Proven Member

    872
    190
    Joined Jul 4, 2003
    Albuquerque, New Mexico
    Knowing what turbo would be nice. Filling a thorough profile would be fantastic. Running around like an ostrich with our heads up our butts is almost a waste of time.
     
    LilRedSpyder likes this.
  9. motomattx

    motomattx Proven Member

    1,659
    466
    Joined Dec 9, 2010
    wampum, Pennsylvania
    It sounds like it could be a tune issue if its been reworked at all, for that matter the 2g seems to have an issue in the factory tune with the knock sensor being very/overly sensitive in certain areas of the map.
     

    Drag Race Build 2K  16

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
    Loading...
  10. Evo joe

    Evo joe Probationary Member

    15
    7
    Joined Jul 20, 2019
    FREEMANSBURG, Pennsylvania
    Have you boost leak tested it? Surprised no one has said this yet!
     

    22  1

    2005 evolution 8 MR
    awd · manual · Lancer Evolution
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    Mauispyder and LilRedSpyder like this.
  11. LilRedSpyder

    LilRedSpyder Probationary Member

    17
    2
    Joined May 2, 2019
    Livingston, Louisiana
    Thanks for the info. I did hook it back up, only drove like 6-7 miles and saw no change so I put it back the way it was.
     

    Street Build 162  1

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM
    Loading...
  12. LilRedSpyder

    LilRedSpyder Probationary Member

    17
    2
    Joined May 2, 2019
    Livingston, Louisiana
    Updated my vehicle profile, cars all stock minus the intake. I got a new oem fuel pump and new filter that are literally 2&3 days old.
     

    Street Build 162  1

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM
    Loading...
    Mello likes this.
  13. LilRedSpyder

    LilRedSpyder Probationary Member

    17
    2
    Joined May 2, 2019
    Livingston, Louisiana
    It didn’t have this issue until after I changed the trans. 4th gear was gone in my old one, swapped with another exact trans w/96k miles. I really don’t believe the trans is causing the problem tho. And I may be new in the dsm world but definitely not auto mechanics.
     

    Street Build 162  1

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM
    Loading...
  14. LilRedSpyder

    LilRedSpyder Probationary Member

    17
    2
    Joined May 2, 2019
    Livingston, Louisiana
    I actually haven’t! That’s something that I will be doing asap. Hopefully I’ll have time after work tomorrow.
     

    Street Build 162  1

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM
    Loading...
    Evo joe likes this.
  15. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Independence, Kansas
    Auto or stick car? If auto, the end clutches and seals are needing replaced. If you are a mechanic, it is easy. Done a couple. Need to put a IPT end clutch kit in mine also but 4th is still working. That will probably change when it see's the Holset HX40 OMG
     

    Attached Files:

    Last edited: Aug 4, 2019

    294  17

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 409  4

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 3K  21

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

    Street Build 5K  11  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM

    4K  24

    1990 Eagle Talon TSi AWD
    13.612 @ 107.760 · 1G DSM
    Loading...
    Vegas smith likes this.
  16. motomattx

    motomattx Proven Member

    1,659
    466
    Joined Dec 9, 2010
    wampum, Pennsylvania
    Where did I say it was a transmission issue???
     

    Drag Race Build 2K  16

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
    Loading...
  17. 19gsx91

    19gsx91 Proven Member

    948
    289
    Joined Apr 20, 2011
    Walworth, New York
    Assuming car is all stock, and he did in fact only swap transmissions that would leave me to wonder a few things...

    A. Please show us an underhood picture so we can get an idea if it is actually all stock.
    B. Do you know how much boost you are currently running?
    c. If the car is 100% stock and it was recently torn apart and was running perfectly fine before the transmission swap then my money is on a large boost leak, probably around the BOV or thottlebody.

    Marty stop showing off that HX, I just picked up a billet one.. waiting for it to come in so I can send you some pictures ;)
     

    Street Build 3K  16

    1992 Mitsubishi Eclipse GSX
    292 whp · 264 lb/ft · 1G DSM
    Loading...
    Mauispyder likes this.
  18. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

    4,020
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    Joined Nov 14, 2013
    Independence, Kansas
    I'm sorry Joe, do you want me to delete it so you feel better?
    I guess I can't help it...
    I'll try to keep them in my build thread from now on!!!!
     

    Attached Files:

    Last edited: Aug 4, 2019

    294  17

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 409  4

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 3K  21

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

    Street Build 5K  11  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM

    4K  24

    1990 Eagle Talon TSi AWD
    13.612 @ 107.760 · 1G DSM
    Loading...
    19gsx91 likes this.
  19. Vegas smith

    Vegas smith Proven Member

    2,530
    1,156
    Joined Dec 2, 2002
    Houston, Texas
    Mods, please delete irrelevant photos whos only purpose is to show off.
     

    Street Build 3K  10

    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
    Loading...
  20. LilRedSpyder

    LilRedSpyder Probationary Member

    17
    2
    Joined May 2, 2019
    Livingston, Louisiana
    Cmon now, who doesn’t enjoy a lil turbo porn...
     

    Street Build 162  1

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM
    Loading...
  21. Vegas smith

    Vegas smith Proven Member

    2,530
    1,156
    Joined Dec 2, 2002
    Houston, Texas
    Mods, ban all members who question me.
     

    Street Build 3K  10

    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
    Loading...
  22. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

    4,020
    1,575
    Joined Nov 14, 2013
    Independence, Kansas
    Ok.
    Your banned.
    :p
    That's Vegas for ya.
    Love you man! We've had alot of fun!!!!
     

    294  17

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 409  4

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 3K  21

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

    Street Build 5K  11  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM

    4K  24

    1990 Eagle Talon TSi AWD
    13.612 @ 107.760 · 1G DSM
    Loading...
  23. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

    4,020
    1,575
    Joined Nov 14, 2013
    Independence, Kansas
    Now, BACK to this top end sputter, any other things that the OP can look over you guys? All input is always welcome!
     

    294  17

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 409  4

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 3K  21

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

    Street Build 5K  11  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM

    4K  24

    1990 Eagle Talon TSi AWD
    13.612 @ 107.760 · 1G DSM
    Loading...
    LilRedSpyder likes this.
  24. LilRedSpyder

    LilRedSpyder Probationary Member

    17
    2
    Joined May 2, 2019
    Livingston, Louisiana
    It’s a stick
    Again, car is completely stock minus a cone filter,
    No clue how much boost it’s making, I haven’t had time to buy and install a boost gauge yet.
    I plan on getting the items needed to do a boost leak test asap. Between work and more work I’ve hardly got time for anything short of sleep. I appreciate all the feedback and I’ll be updating as progress is being made.
     

    Street Build 162  1

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM
    Loading...
  25. E85evo

    E85evo Probationary Member

    2
    5
    Joined Aug 4, 2019
    Gold Coast, Australia
    Could be a boost leak and the car is leaning out, but you said you can creep on throttle and it’s fine?
     

    Street Build 84  3

    1995 CC lancer
    12.6 @ 119 · 4G63t Swapped
    Loading...
    LilRedSpyder likes this.

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