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2G Crank no start/ what I’m I overlooking

Posted by miliman13, Aug 8, 2019

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  1. miliman13

    miliman13 Proven Member

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    F4386FAB-A652-483F-81F7-BFB9CA62A651.jpeg


    here’s a lill history because I know it will come up

    I’ve built the car over 10yrs now
    2 summers ago she made 530hp blah blah
    I’m obsessive; so I’m very meticulous

    This why I haven’t had to touch her in two years now for anything.

    I have verified the following
    Spark
    Fuel
    Fuel pressure
    Compression
    Mechanical timing
    Ignition timing

    I still changed out plugs / coils/ power transistors/
    Speed density sensor

    And nothing...

    So it’s something else not so common; that’s what I need help investigating
    Thanks all.


    “””Ps she went from perfect, to this over night while parked”””
     
    Last edited: Aug 8, 2019

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  2. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Check the coolant temperature sensor.
     

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  3. miliman13

    miliman13 Proven Member

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    Please elaborate I’ve stumbled upon this very same
    Exact
    Statement.....

    What and how does this work within my circuit ?

    I was under the impression this is a 1g thing only
     

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  4. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Last edited: Aug 8, 2019

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  5. greddy_1700

    greddy_1700 Proven Member

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    Condition of capacitors in ECU? Recently had caps that were just starting to leak produce a no start condition.
     
  6. miliman13

    miliman13 Proven Member

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    Well mines is working fine from what I can test through link
    85f on a 85f day
    Doesn’t show the -40f


    For redundancy I measure 1.86 Ko
     
    Last edited: Aug 8, 2019

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  7. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    I say for sure that the CTS is not a problem on your car, that is pretty cut and dried.
     

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  8. miliman13

    miliman13 Proven Member

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    image.jpg image.jpg Looks as good as day ecmlink did maintenance on it ....
     

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  9. greddy_1700

    greddy_1700 Proven Member

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    Being that you mentioned speed density, I assume you have verified that both the IAT and MAP sensors are working properly in link?

    Also, stupid question, but just to rule it out, all of your settings in Link are still uploaded to the ECU? Just confirming that link didnt somehow reset to factory, and that its expecting speed density, plug wire inversion, etc?
     
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  10. Vegas Smith

    Vegas Smith Proven Member

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    Can you post a log?
     

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  11. miliman13

    miliman13 Proven Member

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    So I ran a test
    Unplugged all the injectors
    And jumped the circuit in the starter from engine bay while spraying starting fluid into a vac line...

    It ran rough

    So I had another idea..

    I disconnected my fuel line from the filter and then held it up and injected brand new gas ethanol free I use for my tractor into the line.

    Of course I disconnected the fuel pump as well..

    With a syringe amount of gas that I injected into the fuel line ; it instantly ran...


    Meaning that the gas has gone bad..
    Or it’s bad gas idk....
    And I thought wawa was legit
    .....


    So in conclusion it was intact the gasoline that was preventing the car from igniting and idleling..
     

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  12. miliman13

    miliman13 Proven Member

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    Nope drained gas put new in;
    Starts for a few secs and dies w/3
    Cool lawn ornament I guess .
     

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  13. ThunderChild

    ThunderChild Supporting VIP

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    Have you verified you have good and proper fuel pressure/flow? Also, are you're injectors possibly shelacqued from sitting so long?
     

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  14. motomattx

    motomattx Proven Member

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    I had critters crawl up inside my muffler overnight one time and cause a no start, took me a week or so to figure that one out, try pulling your o2 sensor just for the heck of it and see if it tries to run.
     

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  15. pauleyman

    pauleyman DSM Wiseman

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    How did you verify fuel. I dont think you're getting any. If it ran the day before it isnt the gas
     

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  16. jakk220

    jakk220 Proven Member

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    Sounds like a pump issue if it ran when you put gas in it at the fuel filter line. Are you 100% sure that your pump is kicking on and getting fuel to the rail?
     

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  17. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    Fuel pump rewire fuse??
     

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  18. miliman13

    miliman13 Proven Member

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    9A576D70-1F16-4069-BB47-0094406EADCB.jpeg 6BF2859D-3411-4F2A-9D50-5704FB7032A9.jpeg For the above questions
    Yes I have fuel flow and pressure
    I have sensors that log on link
    I have also seen it with my own eyes
    When I had to drain the whole tank
    This bottle filled up in the time it took me to look up and shut off pump from link


    It has a few times actually reved
    When playing with throttle at crank
    But shuts down right after ....
    I can’t keep it on .
     

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  19. Vegas Smith

    Vegas Smith Proven Member

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    A log could be helpful to double check settings and such.
     

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  20. tsiawd90

    tsiawd90 Supporting Member

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    If you have fuel to the rail, spark, and you have verified ignition timing, I would look into the injectors. Check the connectors and pull injectors and have them cleaned.
     
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  21. miliman13

    miliman13 Proven Member

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    thanks everyone sorry its taken so long, im back again trying things like a mad man.
    i swapped out the starter and MPI relays out; Nothing........

    she still cranks, but wont ignite and stay on .
    if i floor it while cranking it will idle for seconds at a very low rpm .

    im hoping someone has any similar experiences....
     

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  22. miliman13

    miliman13 Proven Member

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    Have been using link to
    Check the functionality of my sensors

    It is very useful.
     

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  23. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    This is sounding more like a tune issue as mentioned earlier. Check your global and deadtimes, injector offsets, etc. Just to be sure something doesn't look funny. What is the wideband telling you for fuel? Rich, lean, cant tell?
    Plugs wet/dry or fouled after attempting to start?
     

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  24. miliman13

    miliman13 Proven Member

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    Nope
    It’s the same settings as before
    I’ve keeped logs for comparison .

    Plugs are fine ; and new as well


    Again the car can’t idle more than 3-5 seconds at max

    Not enough time for any data to be meaningful.

    Even tried a new CAS even though I never suspected it ...

    Not gonna lie in all my years this one event has had me down longer than anything before.

    When you build your car from ground up , you become very familiar with it.

    And in the past it’s taken me minutes to resolve issues ...

    Not this time .....
     

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  25. boostdawd

    boostdawd Supporting Member

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    How did u verify spark? U may be getting it on all cylinders but may be weak ok some. I had this happened on my talon. Spark was present on 2,3 but not as bright as 1,4. Coils were in spec. Swapped different coil packs on 2,3 for the heck of it and ran great afterwards. Mine was experiencing similar issues as yours.
     

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