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cold start issue tdi 130

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by deanski, Nov 14, 2010.

  1. deanski
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    deanski wax on, wax off

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    [Nov 14, 2010]
    any of you fellas had the following problem?

    The problem only occurs in sub zero temps and its when the car is started in the morning or from a long period of inactivity. The car will crank and catch first time no problem but then for a couple of minutes the car runs really rough and struggles to get up to idle speed but then it's fine. Just wanna get to the bottom of it before the really cold weather starts. I've had the glow plugs changed so far but no use.
    #1
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  3. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Nov 14, 2010]
    It could be fuel pump timing, or possibly the injectors. I think the first thing I would try would be to swap the Coolant Temperature Sensor, they're only £20 but at least you can eliminate that.
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  4. BASS 666
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    BASS 666 BMW aye right dead on..

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    [Nov 14, 2010]
    james if its a 1.9 there is no fuel pump timing but i agree with you on the coolant temp sensor..
    #3
  5. Turkster
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    Turkster Bro.Paul 2.5TDI Quattro Sport

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    [Nov 14, 2010]
    temp sensors from Audi was £43 including the plastic U clip inc Vat, got one the other day for an A3 1.9TDI
    #4
  6. paul20v
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    paul20v Audi fanatic

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    [Nov 14, 2010]
    Hi
    if its running rough like this and clears after a short while when cold it could be the injector loom having a moment
    its caused because the injectors are taking a lot more load to fire more fuel in when cold and as soon as that initial period is over all will be well
    i have had this with a few now and the loom changed and all is well
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  7. simon.m
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    simon.m Active Member

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    [Nov 15, 2010]
    i had this too paul although i just give mine a clean and it was much better but if it comes back then ill put a new one in.
    #6
  8. deanski
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    deanski wax on, wax off

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    [Nov 15, 2010]
    i've changed the loom recently as well.
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  9. simon.m
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    simon.m Active Member

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    [Nov 15, 2010]
    so not that then ;-( the temp sensor is about £24 from euro parts
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  10. deanski
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    deanski wax on, wax off

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    [Nov 15, 2010]
    i'll have a go at that then thanks fellas. are they easy to find/fit?
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  11. simon.m
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    simon.m Active Member

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    [Nov 15, 2010]
    its in the thermosat housing i think it is easy to do but just fiddle mate when mine was done my car was ruf to start and the glow plug light took longer to go out and also the car took for ever to get to 90.c
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  12. paul20v
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    paul20v Audi fanatic

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    [Nov 15, 2010]
    If your on the temp sensor thats round the back of the head exhaust side
    you cant miss it its got a 4 wire plug on it and is held in with a plastic C clip ,
    make sure the engine is cold also make sure you pull the O ring out if it isnt attached to the sensor on the way out
    new sensor and o ring and renew the plastic clip and your done .
    Ps. obviously top the water back up with G12+ when your finished .
    #11
  13. Funkyfin2000
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    Funkyfin2000 Member

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    [Jan 5, 2011]
    Did you get to the bottom of this?

    Plus Paul are you able to give me the part number for loom please? im on an AVF engine 1.9tdi Quattro.

    Cheers

    Rich
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  14. paul20v
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    paul20v Audi fanatic

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    [Jan 5, 2011]
    Sorry mate i havent got a part number i got mine from TPS and i have thrown the box away now .
    #13
  15. Funkyfin2000
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    Funkyfin2000 Member

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    [Jan 5, 2011]
    No worries anyone else got a part number handy, couldn't find it on EKTA at all :(
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