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A6 1.9 TDI c5 2004 Won't Start Help

Discussion in 'A6/S6/Allroad forum (C5 Chassis)' started by A6Newbie, Sep 26, 2013.

  1. A6Newbie
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    A6Newbie New Member

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    [Sep 26, 2013]
    Hi, I have this periodic starting problem with my A6. The fuel pump primes, the car turns over, volts are good but doesn't fire up and start. I replaced the t-bar joint for the fuel lines as that sometimes cracks and pulls air in. It was fine but 5 days later same fault?

    Any ideas?
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  3. Administrators
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    Administrators Administrator Staff Member Administrator

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    [Sep 27, 2013]
    Hi A6Newbie

    Have you had a look at the fault codes? are there any ECU blocked etc?
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  4. A6Newbie
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    A6Newbie New Member

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    [Sep 27, 2013]
    No codes! Which is why it's strange. Yesterday at midday I we tout to take dog for a walk and wouldn't start! Later I got it going with some easy start and drive to work. After 10 hours at work went out and started no problems?

    It is very intermittent. My drive is on a slope as is the car park at work. When it's not started it's been pointing upwards! Son think I'm thinking fuel pump fault letting air in?
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    [Sep 29, 2013]
    So it always starts with the nose down hill? Does the amount of fuel in the tank make any difference?
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  6. A6Newbie
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    A6Newbie New Member

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    [Oct 1, 2013]
    No fuel level doesn't change it. It seems to start pointing downhill and flat. I have now also changed fuel filter.

    But I think it must be pump or air getting in some how?

    How much should a fuel pump set me back?
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  7. Chillout
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    Chillout Active Member

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    [Oct 1, 2013]
    Could your tank vent not be opening properly and not allowing air in and fuel out I think that when you fit the cap it pushes a pin in the filler neck opening the tank vent.
    it would start with the cap removed if this is the fault just a stab in the dark though.
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  8. adamss24
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    adamss24 Well-Known Member

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    [Oct 2, 2013]
    Change the fuel filter to a quality Hengst or Bosch and replace the thermostatic tee valve at the same time- use a genuine valve or you can get cheaper Febi ones from Euro Car Parts ! It will cure your issues...
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  9. A6Newbie
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    [Oct 2, 2013]
    Adams24 - right changed both of those with genuine parts and it started after a recent failure, sitting on drive. I'm going to use on a daily basis now with a can of Easy Start just incase! Fingers crossed all will be well. The rear pump seems to be pushing enough fuel all the way to the head so hopefully this will fix it?

    Another question though, you know the fuel pump on the head? Does that have a one way valve in it, so it stops fuel returning down the line? It's just I clamped the hose just after it and it churned but eventually fired up, when I was testing what it could be. This pump is a sealed unit but I was just thinking it could be faulty?
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  10. A6Newbie
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    A6Newbie New Member

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    [Jun 2, 2014]
    Ok I have replaced the fuel pump tank. But now I'm getting a different start fault. Now occasionally after about 15 seconds of turning it splutters into life and starts. Then no issues through the rest of the day, or for a few more days. Could this be injector valve seals?
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  11. Tony22593
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    Tony22593 New Member

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    [Jun 9, 2014]
    Is your filter definitely full up? Take the pipe of the filter and turn ignition on you should get some fuel come through for a couple of seconds and then stop. Make sure this is happening as this primes the system every time. Also make sure that the tee valve has been mounted the right way, a mistake easily done (been there). If that is all good then you may have a problem with injectors
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  12. A6Newbie
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    [Jun 9, 2014]
    Tony,

    Cheers the filter and tvalve was replaced by a mate, who is an Audi mechanic so I hope he has done it right. If not what am I looking for? Also reference the fuel filter, I take it that I should pull hose off engine side? Then if this is not full, what do you think the fault is? I have replaced the fuel tank pump?
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  13. Tony22593
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    Tony22593 New Member

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    [Jun 9, 2014]
    The pipe you want to pull off is the one the that goes back to the tank and get something to catch spilt diesel. Put ignition on and a small amount of diesel should come out just for a couple of seconds and then shut off. The idea of this is to make sure the filter is topped right up before starting. If you don't have any diesel priming the filter it may explain your poor starting fault. If this is all ok has the car had a timing belt recently? Because the next thing I would look at is timing. The timing can also slip as the cam has slight adjustments on 3 13mm bolts mad these can slips if they haven't been tightened enough
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  14. Tony22593
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    Tony22593 New Member

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    [Jun 9, 2014]
    To see if the t valve is fitted right it has a narrow for direction of flow towards the engine so the arrow should be pointing to the pipe that goes to the tandem pump on the back of the head
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  15. A6Newbie
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    A6Newbie New Member

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    [Jun 9, 2014]
    The cam is due to be changed in August. It's done 70,000 from new and had one cam change so this is its second on time not miles. I will get that done first then before valve seals and see if that fixes it. One I check your suggestions. If not then I will change the valve seals.
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  16. Tony22593
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    Tony22593 New Member

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    [Jun 9, 2014]
    What do you mean by injector valve seals? Injector seals? It's very rare that they go and you would then have diesel in your engine oil. I wouldn't think it would be them. Maybe get your mate to check the injection timing/duration on vagcom if he has access to it
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  17. A6Newbie
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    [Jun 10, 2014]
    Ok cheers. I took it to a local Vag garage and told them the vault and asked there opinion they said they have had similar faults and said it was wear on the injector valve seals? I think I will get cam done as that's needed. And get him to do those checks as well. Thanks
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  18. Tony22593
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    Tony22593 New Member

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    [Jun 10, 2014]
    That's fair enough. Those guys have probably got a lot more experience than me!!just I've never come across that before! Let us know what cures it in the end though!
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  19. adamss24
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    adamss24 Well-Known Member

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    [Jul 4, 2014]
    I will get the car to a specialist, ńone of what your mechanics diagnosed does make sense...
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  20. A6Newbie
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    [Jul 4, 2014]
    I have just changed the cam/trimming belts and no change.

    I think I will take it to Diesco, in Ipswich who are Diesel engine/injector specialists and see if they can diagnose the fault.

    When I had the cam belt done at a local VAG garage they put it on the box and no fault codes! They reckon it's either leaking injector valve seals or engine fuel pump! Which would be costly. But if I take it to Diesco they should be able to recondition the pump if that's the fault!
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  21. A6Newbie
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    A6Newbie New Member

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    [Jul 4, 2014]
    I have a film clip of it not starting and will try and upload it.
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  22. A6Newbie
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    [Jul 4, 2014]
    Last edited by a moderator: Aug 15, 2014
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  23. A6Newbie
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    [Jul 4, 2014]
    On this clip the fuel comes through and it starts quickly, sometimes it is more spluttering before firing up!?
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