ALH TDI wont start?!?

Discussion in 'VW Mk4 Jetta, Golf, New Beetle, Passat TDI forum' started by mason097, Nov 25, 2016.

  1. mason097

    mason097 New Member

    Joined:
    Nov 25, 2016
    Messages:
    3
    Car:
    1999.5 Jetta TDI
    Location:
    Central Texas
    New to the forums. Hello. I have experience with engine in a strictly mechanical sense (chevy v8s) and trying to learn more about electrical systems. My ALH doesn't want to start after sitting overnight. On 2 occasions in the past week the engine had taken 4 or 5 turns of the key to turn start, but once it did it kept going all day and restarted fine. This morning the car did not start. Just kept cranking, no fires what so ever. Its not cold here (60* F) so glow plugs don't seem like the cause. Recharged my battery and it still wont start. Car has been giving me a P1248 code for awhile but I don't think it is related. Any suggestions on how to diagnose? Thanks, Mason
     
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  2. Vwman2015

    Vwman2015 Member

    Joined:
    Oct 3, 2015
    Messages:
    292
    Car:
    Vw golf, mk5 2005 sdi, bkd engine
    Location:
    Clacton
    Injection timing perhaps or injector connector/wire fault


    Sent from my iPhone using Tapatalk
     
  3. Keithuk

    Keithuk Super Moderator

    Joined:
    Aug 29, 2010
    Messages:
    6,877
    Car:
    2010 Golf GTD (170) CBBB
    Location:
    Stoke on Trent, England
    VAG Error Code: 17656/004680

    EOBD II Error Code: P1248

    Fault Location:
    Start of Injection Timing Regulation - Control Deviation

    Possible Cause:
    Loss of Power at high Engine Speeds.
    Engine difficult to Start.

    Start of Injection Timing Regulation not OK.
    Injection Pump Control Range blocked/dirty (e.g. by Metal Particles).
    Engine has stalled/ran out of Fuel recently.
    Wiring/Connector(s) from/to Injection Valve (N108) faulty.

    Possible Solutions:
    Check/Adjust Injection Start. See TDI Timing Checker
    Check Fuel Supply.
    Check/Replace all faulty Wiring/Connector(s).
    Run Output Tests.

    Special Notes:
    Might by stored with other codes like 17654/P1246/004678.
    When stored in the VW (9M/1J) Golf/Jetta or (1C) Beetle with the ALH engine code Tech Tip 23-02-03 may be helpful. The summary involves removing power at idle to the Cold Start Injector (N108) (Fuse 34 on those body styles) while monitoring Basic Setting group 000.2 which is shown under "Timing" when using the TDI Timing Checker. When power is removed from Cold Start Injector (N108) the live reading should change to 255.

    TDI VE Start of Injection

    As taken from my new Free EOBD II Error Codes software
     
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  4. mason097

    mason097 New Member

    Joined:
    Nov 25, 2016
    Messages:
    3
    Car:
    1999.5 Jetta TDI
    Location:
    Central Texas
    FOUND THE PROBLEM! Checked all the fuel lines and they were empty. Got a new filter and lines and replaced/purged everything. Started right up. BUT the fuel is leaking out of the injection pump. Thats where the air came from I guess. It seems to be leaking from the middle bolt (center of the 4 metal injector lines) on the driver side, can I just tighten this bolt or should I re-gasket everything? Thanks for all your responses.
     
  5. diep

    diep Member

    Joined:
    May 21, 2013
    Messages:
    52
    Car:
    VW Bora TDI, 1999
    Location:
    Germany, Frankfurt am Main
    Mods:
    ECU tuning, Firad DSLA 150P 502 nozzle , EGR deleted
    You can try to tighten the bolt if loose but I would prefer a new gasket set.
    4 cuper rings an the gasket for the center bolt are what you need.
    edit: lube the gasket before installation. It can break.
     
  6. mason097

    mason097 New Member

    Joined:
    Nov 25, 2016
    Messages:
    3
    Car:
    1999.5 Jetta TDI
    Location:
    Central Texas
    Thanks diep, but I fixed it about a month ago. I was able to recreate both of the anti-tamper bolts, installed the bosch gasket set and was good to go.
     

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