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Audi A4 Auto startup problems with video

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by Archies, Aug 10, 2014.

  1. Archies
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    Archies Member

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    [Aug 10, 2014]
    Can anyone shed any light on the startup problem im having. It only does it when the cars been on a run of several miles. It doesnt do it when the engine is cold. Its an A4 Auto multitronic 7 speed box 2007 model. Its had 2 starter motors on it the latest one being a genuine one.
    Not sure it if its got a Dual mass flywheel, ive heard it won`t have it as its Auto.

    Or could this be the Oil pump/balance issue.?

    Any help Chaps

    IMG 0900 - YouTube
    Last edited: Aug 10, 2014
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  3. Paul B7
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    Paul B7 Active Member

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    [Aug 11, 2014]

    You can discount the oil pump/balance shaft issue straight away, nothing to do with starting.
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  4. Archies
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    [Aug 11, 2014]
    Thanks Paul.

    Ive found out today from an Audi garage that even though its an Auto box it still might have a DMF.
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  5. Giosabcsl
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    Giosabcsl Active Member

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    [Aug 11, 2014]
    It could be the input sensor or the crank sensor. Any lights on the dash? if possible see if you can get the car scanned.

    Usually when cars have been on a run and wont start or struggle to start. The crank sensor is playing up. Because it throws "the firing procedure out of alignment"

    As for the gearbox they dont usually have a DMF, usually a torque converter.
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  6. lynallbel
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    lynallbel Active Member

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    [Aug 11, 2014]
    Could be a fuel air leak, Ive had crank sensors play up before on mercs, but they always went wrong when engine was hot, then would work again for a short time when engine had cooled down.
    As for the multitronic it seems nobody knows whether they still have a clutch and dmf or a fluid flywheel.
    Im of to google out of curiosity!
    It s a CVT transmission and just about every car maker who has made a cvt has regretted it big time, as for clutch got to go wifes called tea up!
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  7. lynallbel
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    lynallbel Active Member

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    [Aug 11, 2014]
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  8. theo289
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    theo289 Member

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    [Aug 12, 2014]
    be intrigued what this issue is - have it occasionally on mine. manual B7 a4 special edition
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  9. Archies
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    [Aug 12, 2014]
    Definitely Dual Mass Fly wheel, took it to an audi specialist today, he says hes come across it a few times before, been quoted £660 all in for a new one.
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  10. lynallbel
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    lynallbel Active Member

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    [Aug 12, 2014]
    Did he explain how the dmf causes this problem?
    I would like to know as the crank signal is going to have its pick up points on the fixed part of the flywheel and not the moving dmf part.
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  11. Archies
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    Archies Member

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    [Aug 12, 2014]
    No he didnt explain how it causes this problem, he listened to it as i turned it over and he said it was the DMF, and he had heard it before..

    Are you thinking it may be a crank sensor??? rather than the DMF
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  12. sumo
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    sumo Member

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    [Aug 12, 2014]
    The starter ringgear is fixed to the back of dmf so it will not move about with the flywheel however when the flywheel is very worn it can contact the starter motor gear and cause it to try and lock the starter and cause this issue.

    Hope this helps.
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  13. Archies
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    Archies Member

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    [Aug 13, 2014]
    Thanks Sumo, definitely sounds like the DMF then as i have had 2 starters on it since the problem started.
    The cars still (was) under warranty from the garage i got it from, but its gone just over the 12000 mile limit so they have said i have got to pay half towards the repair, but the problem started before the 12000 limit but they refuse to foot the total bill..
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  14. sumo
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    sumo Member

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    [Aug 13, 2014]
    Then surely you can argue that the two starters are evidence of the original problem was there before the end of warranty,push them for it and ask them to prove it wasn't there before. They can't so will have to pay!
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  15. Archies
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    [Aug 16, 2014]
    Thats exactly what i did Sumo and they agreed to foot the bill New DMF fitted and touch wood everythings been fine..
    Thanks for your replies
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  16. theo289
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    theo289 Member

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    [Aug 19, 2014]
    is there any update on this? exactly the same issue on mine...

    thanks
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  17. Archies
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    [Aug 19, 2014]
    Its the DMF definitely, i had it replaced at an Audi garage and its fine now, bill was £680 all in but i argued the toss with the garage as it originally went wrong while it was still in warranty. They mis-diagnosed the problem so they footed the bill.
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  18. Archies
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    [Aug 19, 2014]
    Had the DMF replaced, the garage footed the bill as i argued with them that it was still under warranty when the problem occured.
    Its fine now, no noise when it starts so it was the DMF.
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  19. theo289
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    theo289 Member

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    [Aug 19, 2014]
    Are DMF covered under warranties? I don't have an Audi warranty but have an extended warranty through a third party on mine. May see if it is covered to get it replaced
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  20. Archies
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    [Aug 20, 2014]
    Mine wasn`t an Auid Warranty, it was a warranty that was supplied by the garage i got the car from. They tried to argue the DMF wasnt at fault, but once they knew it was they then tried to say it had not actually broken, it did still work wheather it made a noise or not on start up.
    Im not sure wheather it can actually break so the car becomes undrivable. I would see what they say.
    #19

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