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Thread: Audi A8 4.0 TDI 2004 Starting issue

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  1. Audi A8 4.0 TDI 2004 Starting issue 
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    Good evening !

    Any help or advice would be hugely appreciated. I own an Audi A8 4.0 tdi 2004 model, the car starts well from cold any time if year but it started taking longer and longer to start when it was warm but always started, the first time it failed to start, I replaced the battery and this seemed to help the problem initially for the first 2 wish weeks, then it returned to how it was before. since then around 12 months ago (it really gets used now I work away and cannot rely on the car what so ever) the alternator is charging the battery but I'm unsure on how well it dose, usually sits at 13.2v but if held at 1200 rpm sits at between 14.2v and 14.5v as I would expect. and maintains at least 13.8v to 14.4v when driving.

    I initially thought it was the alternator but i guess it is putting charge back into the battery but is it enough?

    I then thought starter motor as it seems lazy and turning over slow but its fine when its cold. but when boosted (I don't like doing it) it turns over really well and starts perfectly when its hot. I have investigated the location and feasibility of changing the starter motor and it seems like a total pain in the **** job !

    I guess I'm just going round in circles pulling my hair out and this is really ruining the A8 experience. so any help and any info the help me sort this out would be seriously appreciated.

    if any of you could also tell me what the alternator for this model should charge at would be brill.

    Cheers
    Reiss
     
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  2. Re: Audi A8 4.0 TDI 2004 Starting issue 
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    So you have had it fault code read to see if the sophisticated engine management system has picked up something such as glow plug failure, a service item?
    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:
     
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  3. Re: Audi A8 4.0 TDI 2004 Starting issue 
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    To be clear, you don't have problems starting when engine is cold.
    When engine is up to temp and you stop for a short time, when you come to restart the starter turns over slowly as if the battery is drained?

    In several cases, this was found to be the main power cable connection which is just to the right of the driver's right foot behind the carpet/insulation.
    There is a thick cable and a terminal box within a metal and plastic box here.
    People have found signs of overheating, soot on the insulation and inside the box, shrivelled heat shrink, dark insulation.
    People have found this connection feels hot on affected cars.
    When the battery is low and you start the car, the charging current makes the connection hot and doesn't charge the battery very well and then when you come to do a hot restart, the current can't get through to the starter and the battery is still low to make things worse.
    The attempts to start the car make the connection even hotter. Once cooled down for 20-30 mins, it usually starts.
    3.0TDI Hot Start Issue, Very Slow Cranking - A8 Parts Forum

    http://forum.a8parts.co.uk/showthread.php?t=13499

    IMG_1506.jpg
    Last edited by snapdragon; 14-05-2019 at 04:47 AM.
    Audi A8L- 2006 - 3.0TDI
     
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  4. Re: Audi A8 4.0 TDI 2004 Starting issue 
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    Snapdragon I owe you a pint or 10 !!! so I stripped it down (about 10 mins) pull the cabe off and hey presto it was the same as the one photographed !
    I also noticed that the nut on the terminal was plated with something so cleaned that up, crimped and soldered a new end on to the the cable and its been perfect ever since !

    Turns over better and faster and charges at 14.2 amps absolute life saver !

    Thank You
     
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  5. Re: Audi A8 4.0 TDI 2004 Starting issue 
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    Glad you sorted it - that was quick I would have pontificated for weeks.
    I'm just passing on someone else's knowledge!
    Same issue on the Q7 but it's under the brake fluid reservoir...
    #085(6) пайка плюсового кабеля(от акб) Audi Q7,VW Touareg - YouTube
    Audi A8L- 2006 - 3.0TDI
     
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