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V6 Startings Issues after belt change.....

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by S4_dan, Nov 9, 2013.

  1. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Nov 9, 2013]
    Hi I had the belts change on my V6 last monday by a local Garage. They have worked on Audi's before and regularly do belts on Police Audi vehicles.

    Anyway, picked the car up Monday evening and all was fine. Tuesday morning the wife went to start it and she took a few turns before firing which it has never done since me owning it. Tues Lunch it was the same she said. I drove it Tuesday evening and it was fine every time I started it.

    Wednesday it started fine first thing in cold/frosty temps but at lunchtime & evenings it takes a wee while cranking before firing. And same goes for Thurs and Friday.

    I initially thought it may be air in the fuel lines if they had disturbed the fuel system somehow. I know they depleted my Aircon system and re-gassed after changing the belts.

    I only have VCDS Lite (Activated) with an eBay lead so I can't get the TDI-Graph function. And the numbers are all gobble-de-gook to me!

    Any pointers please?

    I've not looked under the bonnet as yet, but have had VCDS scan and nothing shows up for DTC's.

    Dan
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  3. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Nov 9, 2013]
    Oh, the wife also said that on THursday lunchtime, the engine ran rough for a very short time after starting with black smoke from the exhausts. It has never smoked a lot this car which surprises me to be honest.

    However, the car is due a service in 300 miles so I will do that next weekend.
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  4. adamss24
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    adamss24 Well-Known Member

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    [Nov 9, 2013]
    Yes,the garage of your choice used the "mark and pray" method so either the crank/cam timing is wrong or the pump is either too retarded or too advanced hence it takes a while to start then the electronics take over...Could also be a battery on it's last legs but it would not account for smoke and rattles...
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  5. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Nov 9, 2013]
    Even if the the starting is random? Sometimes fires first times straight away, other not so quickly. The smoke has only happened once. The car is used 4 or 5 times a day. Performance hasn't changed (or at least feels like it hasn't)

    I have thought about the battery being weak, will get a drop test done on it for peace of mind.

    Why do you have to live so far away Chris!!! lol
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  6. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [Nov 9, 2013]
    Does sound like fuel pump timing, the irregularity is probably down to other factors such as temperature etc.

    The fact it has only been like it since the belt change is the telling point really.
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  7. S4_dan
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    S4_dan Fire up the Quattro! VCDS Map User

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    [Nov 10, 2013]
    Is there anyway of adjusting it without TDI-Graph?
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  8. AlexGSi2000
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    AlexGSi2000 Well-Known Member VCDS Map User

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    [Nov 11, 2013]
    Not really, its pretty precise.
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