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2G Idle, boost gauge, power feels low

Posted by Sjd6795, May 7, 2020

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  1. Sjd6795

    Sjd6795 Proven Member

    422
    101
    Joined May 14, 2014
    Wilsonville, Oregon
    Been tackling a few issues I've solved some things and others still havent figured out yet.

    At high RPM at 15 psi my car would hit what feels to be fuel cut. So I rewired and installed a walbro 190 and it still seems to have the same issue.

    Sometimes usually when the car is warmed up it will die if I push the clutch in to pull up to a stop sign. Other then that idle is perfect both cold and warm.

    My boost gauge is an autometer I havent changed anything from the previous owners install. It seems he uses a hard nylon type line but it's small maybe an 1/8th. The issue is sometimes it stays stuck at 0 psi during idle when it should be reading vacuum. Boost reads fine but then it just drops back down down to 0 when idle.

    Car just doesnt pull that hard like it use to, timing is fine, boost leaks are fine, could this be related to heat soak? I have a fmic so that seems unlikely though and outside temps are 70s. Could this issue be why my boost gauge reads 0 at idle could the wastegate be stuck or anything?
     

    Street Build 493  11

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
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  2. ThunderChild

    ThunderChild Supporting VIP

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    Rathdrum, Idaho
    What about your BOV or turbo condition?
     

    Street Build 733  3

    1990 Plymouth Laser N/T
    fwd · manual · 1G DSM

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    1987 Toyota Pickup/Hilux
    awd · manual · Misc Vehicles

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

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    1992 Eagle Talon TSi AWD
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    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  3. Sam's GSX

    Sam's GSX Proven Member

    176
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    Joined Jun 10, 2018
    Hohenwald, Tennessee
    With my situation, it was the spark plug wires, I tried to find what was doing it for a year, but that just applies to the high rpm fuel cut like behavior
     

    Street Build 404  3

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  4. Sjd6795

    Sjd6795 Proven Member

    422
    101
    Joined May 14, 2014
    Wilsonville, Oregon
    New tdo5 small 16g just put on, new gaskets and everything was torqued to specification no leaks around the manifold or anything. And BOV is being recirculated and sounds fine nice noise when letting off gas and nothing tees into the line it has it's own seperate vaccuum source.

    Right after install it pulled hard then got weaker. Car was previously tuned at 15 psi on a 14b so I dont think 15 psi on a 16g would change a whole lot I did rewire fuel pump and upgraded to a walbro 190 to compensate.
     

    Attached Files:

    Street Build 493  11

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  5. Sjd6795

    Sjd6795 Proven Member

    422
    101
    Joined May 14, 2014
    Wilsonville, Oregon
    I just installed new NGK BPR7ES and NGK plug wires thinking it was the issue but it wasn't =/
     

    Street Build 493  11

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  6. Sam's GSX

    Sam's GSX Proven Member

    176
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    Joined Jun 10, 2018
    Hohenwald, Tennessee
    Ok good so that's not it, unfortunately there are so many things that can cause that, I know because I tried almost all of them before fixing it.
    Its odd that it wasn't happening at first, I was thinking maybe your running out of fuel, I believe that's about 107% injector duty cycle on stock injectors, (at least it was for me on a cxracing 20g at 15psi)
     

    Street Build 404  3

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  7. Sjd6795

    Sjd6795 Proven Member

    422
    101
    Joined May 14, 2014
    Wilsonville, Oregon
    So possibly injectors next.. My car is also a 2.3l stroker I don't know if that would make things much different. a 20g at 15 psi flows a lot more then a small 16g at 15 psi. I can turn boost down to like 12-13 and see if it does it I guess.
     

    Street Build 493  11

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
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  8. Sam's GSX

    Sam's GSX Proven Member

    176
    23
    Joined Jun 10, 2018
    Hohenwald, Tennessee
    That sounds like a good idea, and anyone else can chime in, I'm definitely not the expert on fixing this problem haha
     

    Street Build 404  3

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  9. pauleyman

    pauleyman DSM Wiseman

    5,441
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    Joined Nov 19, 2011
    oklahoma city, Oklahoma
    You have some misinformation. Fuel cut has nothing to do with lack of fuel. Adding a fuel pump and rewire will not change anything if its fuel cut. If you're on stock injectors 16g and a front mount you are very likely out of fuel. Biggest fuel pump you can find still won't fix it. Fuel cut is based on airflow.
    As far as boost gauge get rid of that nylon line. It leaks. That won't be the cause of your problem. Likely, if it's always done this, the line is plumbed into the fuel pressure vacuum line and if so its on the wrong side of the solenoid. You will boost, get off throttle and the gauge snaps back to zero. Sound familiar?
     

    Street Build 3K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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    ThunderChild likes this.
  10. Sjd6795

    Sjd6795 Proven Member

    422
    101
    Joined May 14, 2014
    Wilsonville, Oregon
    It doesn't always stay at zero it's 50/50 sometimes it goes to zero other times its around 17-21 vacuum. It's installed correctly, but I will replace the nylon line when I can I will have to get barb fitting as well as the autometer gauge has the swagelok style nuts for the nylon line.
     

    Street Build 493  11

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
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  11. pauleyman

    pauleyman DSM Wiseman

    5,441
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    Joined Nov 19, 2011
    oklahoma city, Oklahoma
    In my experience the gauge will read zero when the car is cold. So. Take a look where it is hooked up.
     

    Street Build 3K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  12. Sjd6795

    Sjd6795 Proven Member

    422
    101
    Joined May 14, 2014
    Wilsonville, Oregon
    Most of the time cold starts it reads vacuum not much about 10 then usually when warm after a few pulls is when it starts reading 0.
     

    Street Build 493  11

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  13. pauleyman

    pauleyman DSM Wiseman

    5,441
    1,231
    Joined Nov 19, 2011
    oklahoma city, Oklahoma
    Just verify the gauge has a direct line to the manifold.
     

    Street Build 3K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  14. jed344

    jed344 Supporting VIP

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    Joined Jan 10, 2008
    Waterville, Iowa
    So this car is a 2.3 stroker with bigger turbo on stock ecu? Do you have something to tune with and a wideband?
     

    1K  38

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  15. Sjd6795

    Sjd6795 Proven Member

    422
    101
    Joined May 14, 2014
    Wilsonville, Oregon
    No it has a black box ecu that had previously been tuned by english racing who also did the 2.3l install.
     

    Street Build 493  11

    1997 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
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