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Street Build 1998 GST 6 bolt

Year:
1998
Model/Trim:
Mitsubishi Eclipse GST
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  1. ThunderChild

    ThunderChild Supporting VIP

    3,738
    1,093
    Joined Jan 5, 2012
    Rathdrum, Idaho
    The gss341 is still a genuine walbro, the logo has been updated. The 392 has the old style logo still.
     

    Street Build 926  3

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

    883  8

    1987 Toyota Pickup/Hilux
    awd · manual · Misc Vehicles

    Street Build 1K  7

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

    2K  0

    1992 Eagle Talon TSi AWD
    manual · 1G DSM

    Street Build 3K  10

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  2. Sniffbooger

    Sniffbooger Proven Member

    215
    72
    Joined Apr 12, 2020
    Torrance, California
    To be clear, this was supposed to be a genuine Walbro 255lph pump #GSS342. It is correctly stamped with this part number on the housing, but the the logo is not designed right. The logo is faded from bottom to top, like a bad hand stamp rather than a hydraulic press, and the notch is missing from the bottom of the logo in the 'W'. It is also too squared at the bottom corners. Compare pics...
    IMG_20200617_082042310_LL~2.jpg
    Here is the real one...
    Screenshot_20200617-084937~2.png
    There are many other clues to spotting a fake. Another big one is the fake one has plastic gears seen inside the inlet tube. The real one has metal gears.
     

    Street Build 341  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  3. Sniffbooger

    Sniffbooger Proven Member

    215
    72
    Joined Apr 12, 2020
    Torrance, California
    Just picked up a new in box AEM 340lph E-85 compatible fuel pump locally for $100. Just in case I ever go that direction....
    IMG_20200617_124912963_LL.jpg
     

    Street Build 341  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  4. Sniffbooger

    Sniffbooger Proven Member

    215
    72
    Joined Apr 12, 2020
    Torrance, California
    Had an oil leak at the turbo return line where it connects to the oil pan. Today I replaced it with a custom AN line that is flexible. The AN couplings are a little more restrictive than the inner diameter of the OEM metal line. I may order a larger diameter one in the future when I upgrade the turbo for better oil drainage. Good for now. No more leaks!!

    IMG_20200622_162410480.jpg

    IMG_20200622_143504045.jpg
     

    Street Build 341  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  5. Sniffbooger

    Sniffbooger Proven Member

    215
    72
    Joined Apr 12, 2020
    Torrance, California
    Replaced the front sway bar end links today. With no car lift. What a pain!
    IMG_20200625_111806747~2.jpg
     

    Street Build 341  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  6. Sniffbooger

    Sniffbooger Proven Member

    215
    72
    Joined Apr 12, 2020
    Torrance, California
    Today I wet sanded my headlights with 800/1000/2000 grit and cleaned with rubbing alcohol prior to spraying a new polyurethane clear coat. Much better! IMG_20200630_145051126_LL.jpg

    After!
    IMG_20200630_150315093~2.jpg
     

    Street Build 341  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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    TK's9d2TSi likes this.
  7. Sniffbooger

    Sniffbooger Proven Member

    215
    72
    Joined Apr 12, 2020
    Torrance, California
    Installed my black leather wrapped GSX steering wheel today! The old crappy sponge vinyl wheel came off pretty easy.
    IMG_20200705_183123474.jpg IMG_20200705_183702321.jpg IMG_20200705_183430962.jpg
     

    Street Build 341  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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    TK's9d2TSi likes this.
  8. Sniffbooger

    Sniffbooger Proven Member

    215
    72
    Joined Apr 12, 2020
    Torrance, California
    Finally got my boost leak testing started today...it wasn't good...I knew it didn't run right (idle issues) and wouldn't hold boost but it wouldn't even hold 1psi on the test gauge when we pressurized the system...it was hissing loudly and leaking out the intake manifold gasket! Damn...tried tightening up the bolts but didn't help....so now I need to order a new gasket and replace it...
    IMG_20200720_184636923.jpg
     

    Street Build 341  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  9. Sniffbooger

    Sniffbooger Proven Member

    215
    72
    Joined Apr 12, 2020
    Torrance, California
    I ordered a premium intake manifold gasket that is metal with a sealing ridge and installed it today. I removed the coil wires, fuel rail, injectors and upper engine harness to access the upper manifold bolts easily. I reached underneath the manifold, on the driver side with a combination wrench to access the bottom manifold bolts.
    IMG_20200903_104744620_LL.jpg IMG_20200903_110020206_LL.jpg

    After disconnecting some vacuum lines, throttle cable, harness clips, and throttle body bolts, I easily lifted the manifold out of the bay.
    IMG_20200903_113713802_LL.jpg

    I carefully scraped the old paper manifold gasket off with a razor blade from both surfaces. I noticed the old gasket was too large did not fit properly. It was from a 1g! Idiots....there is NO way it could seal. I want to go punch the imbecile who installed it....This was the cause of my major boost leak. This also explains why I could never get the car to idle properly!
    IMG_20200903_121139936.jpg

    The NEW metal 2g gasket looks like this:
    IMG_20200903_121645924.jpg
     
    Last edited: Oct 4, 2020

    Street Build 341  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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    TK's9d2TSi likes this.
  10. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

    6,747
    2,958
    Joined Nov 14, 2013
    Independence, Kansas
    You never know what you will find on these machines. I ordered some 2g intake gaskets (and 1g at the same time) from a well known vendor and got only 1g gaskets for different #'s. The gaskets were identical and definitely 1g.
    Glad to hear there is positive progress!!!
     

    Street Build 5K  29

    1992 Eagle Talon TSi AWD
    14.74 @ 117.04 · 1G DSM

    2K  14

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    888  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 1K  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 6K  14  25

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

    Sniffbooger Proven Member

    215
    72
    Joined Apr 12, 2020
    Torrance, California
    Thanks! It's understandable if you order something and they send the the wrong part... or if the part you ordered is not described correctly, and does not fit your application. However if someone gets a 1G intake manifold gasket and then proceeds to install it on a 2G head they're an imbecile. The difference is plain as day. The 1g gasket will not even seal the 2g manifold due to it's larger sized portholes. Now it is fixed. While the manifold was off, I also noticed a frayed positive battery cable that is bolted to the starter. I'll need to replace that too.
     
    Last edited: Sep 4, 2020

    Street Build 341  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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  12. Sniffbooger

    Sniffbooger Proven Member

    215
    72
    Joined Apr 12, 2020
    Torrance, California
    So it turns out my intake manifold gasket was not the only source of the boost leak. With further testing I also discovered the fuel injector seals were all leaking, as well as the throttle body shaft seals, and the power brake vacuum hose from the intake manifold was also leaking pressure... It's a wonder I got this thing to run at all! So I ordered some new fuel injector seals and throttle body seals and I replaced the fuel injector seals today. So far, I have increased the idle vacuum from 8 PSI pre repair, to 15 PSI at idle.. It idles a little smoother now and I'm sure it will be even better once I replace the throttle shaft seals. Now it is actually boosting pressure up to 10 psi when driving. But I know that is still not high enough even for the factory setting. I will update soon!
     

    Street Build 341  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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