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1g tsi miss fire

Posted by Mark E Brooks, May 31, 2020

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  1. Mark E Brooks

    Mark E Brooks Probationary Member

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    Joined Mar 23, 2020
    Waynesboro, Virginia
    I cant figure out this miss i put spark plugs wires cleaned the injector i did a compression test it was 119psi just a hair under 120 that seems pretty good to me i have a guy that has built alot of these motors he says thays past the service point the car did sit for about 8 years when i got it in February i did a tune up oil changed check the timing belt everything was good ran great now it stutters when it hits about 6-8 pounds of boost only does it under boost it seems did a fuel pressure test it was 30 psi with regulator vacuum on 40 off what am i missing or am i wrong to think that 119 120 on the compression test is good please help
     

    98  1

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

    Vegas smith Proven Member

    3,147
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    Joined Dec 2, 2002
    Houston, Texas
    Damn, that was a long sentence. Sounds like a clogged fuel filter. Fuel pressure should be 37.5 with vacuum line removed.

    edit: if the cylinders are indeed hitting 119 then that's below the service limit and a likely cause.
     
    Last edited: May 31, 2020

    Street Build 4K  10

    1993 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  3. Sniffbooger

    Sniffbooger Proven Member

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    Joined Apr 12, 2020
    Torrance, California
    120 seems really low, i would recommend a cylinder leak down test...that will show where the problem is...a leaky head gasket could cause a misfire under boost...had the same thing happen to my '87 Toyota turbo pickup...I ended up doing a coolant block test with the liquid and it showed combustion byproducts in the coolant... replaced the head gasket and fixed it! The reason i chose that coolant block test initially was because I suspected it might be a head gasket...took off the radiator cap and it smelled like combustion vapors a little bit...
    You can also check the engine oil...is there any coolant in the oil? Take off the oil cap and if it looks milk chocolate color thats a problem! However this doesn't always happen with a faulty head gasket...
     

    Street Build 257  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
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    Mark E Brooks likes this.
  4. Mark E Brooks

    Mark E Brooks Probationary Member

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    Joined Mar 23, 2020
    Waynesboro, Virginia
    Thanks ill check that today
     

    98  1

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
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  5. ThunderChild

    ThunderChild Supporting VIP

    2,945
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    Joined Jan 5, 2012
    Rathdrum, Idaho
    Compression is quite low. And do a boost leak test you have classic symptoms.
     

    Street Build 722  3

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

    698  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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