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1995 talon tsi starts dies after 2 seconds

Posted by EaglesTalon, Aug 13, 2020

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  1. EaglesTalon

    EaglesTalon Probationary Member

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    Joined Aug 13, 2020
    Parker, Colorado
    1995 talon tsi replaced short block, forged internals, rebuilt head, all stock except 14B turbo and 255 fuel pump, been 10 years to get it back together. Engine starts, runs 2 seconds and dies. Replaced fuel filter, replaced fuel pump with 255 walbro,jumped fuel pump, pump works, verified timing, replaced Cam angle sensor, after all this same problem. Disconnected crank angle sensor, engine no start, reconnected crank sensor, engine starts runs 2 seconds checked FPR no fuel leak from vacuum side, disconnected MAF engine will stay running but stumbles, reconnect MAF engine dies in 2 seconds. swapped in known good MAF same problem. Cleared codes and restart, no codes on scanner,
    all grounds connected on engine
    Kicked left front tire still no difference, Anyone have a possible answer thanks
     
  2. Strengthega

    Strengthega Probationary Member

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    Joined May 24, 2017
    Waukesha, Wisconsin
    Check your iac, possibly is stuck. Disconnecting the battery and letting the ECU relearn fixed this same problem for me once.
     
  3. luv2rallye

    luv2rallye DSM Wiseman

    7,795
    703
    Joined Jun 7, 2003
    Minneapolis, Minnesota
    Might still be the fuel regulator (on the end of the fuel rail) leaking fuel back to the tank. The pressure should stay for hours/days in the rail when the engine is turned off. But if the regulator is leaking it's gone in seconds. You could temporarily pinch off the return line with a clamp/fingers to see if it stays running. Or just buy a new one as they are cheap.
     

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  4. EaglesTalon

    EaglesTalon Probationary Member

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    Joined Aug 13, 2020
    Parker, Colorado
    Thanks for the reply's . Disconnected battery ,then reconnected battery same problem, disconnected iac electrical connector, same problem, Installed afpr, set pressure @ 43 psi while running with maf disconnected (runs but stumbles) reconnected maf engine still dies in 2-3 seconds. reconnected iac made no difference, did notice fuel pressure gauge goes to 0 after engine dies but back to 43 psi upon start, if maf disconnected with engine running.
    Still stumped if anyone one has any other input would be great
     
  5. Strengthega

    Strengthega Probationary Member

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    Joined May 24, 2017
    Waukesha, Wisconsin
    Have you done a boost leak test? Worth a shot to check ecu as well. If it runs with the maf unplugged.. could be alot of things.
     
  6. EaglesTalon

    EaglesTalon Probationary Member

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    Joined Aug 13, 2020
    Parker, Colorado
    with the engine dying in 2 seconds did not even consider boost leak as it s not running long enough to build boost.Engine will rev up with maf disconnected but have noticed some back firing type noise in manifold when revving it up. All connections are tight its all newly installed never been off the jack stands yet
     
  7. Strengthega

    Strengthega Probationary Member

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    Joined May 24, 2017
    Waukesha, Wisconsin
    Better safe then sorry. With a big enough leak after the maf under vacuum unmetered air could be entering the intake and could cause something like this. Would explain why it runs without the maf plugged in.
     
  8. EaglesTalon

    EaglesTalon Probationary Member

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    Joined Aug 13, 2020
    Parker, Colorado
    tested and cleaned iac, tested good and operates as advertised. Haven't performed boost leak test yet will try to complete this weekend.Took a break from it for the last week Open to any other ideas to check or test thanks
     
  9. spyderdrifter

    spyderdrifter Freelancer

    4,963
    555
    Joined Jul 11, 2009
    Fountain, Colorado
    You're supposed to kick the right rear tire.... ROFL

    A boost leak test can be done without the engine running, just gotta use a compressor to pump air into the engine.
     

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  10. EaglesTalon

    EaglesTalon Probationary Member

    5
    0
    Joined Aug 13, 2020
    Parker, Colorado
    Sorry for the long delay been busy. Purchased a new MAF and installed. Tightened and re-clamped all intercooler piping, engine now starts but will not idle, can feather the gas pedal to keep it running but runs bad ,backfire thru intake occasionally running very rich . Pulled plugs all firing but covered in black soot, tested injectors with ohm meter all @ 2.7-2.8 ohms, connected snap-on code reader but has no codes, not sure what else to test. Was thinking possible coolant temp sensor to test next, Any ideas would be great thanks
    Right rear tire was off so after kicking it I noticed no difference, so kicked them all, as well as my other cars tires, still no luck
     

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