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oh no, car has started to rumble when accelerating?!?! what can it be?

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by gadgesxi, May 8, 2010.

  1. gadgesxi
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    gadgesxi Member

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    [May 8, 2010]
    Just went to tatton park, fine. Had a walk then back to the car and started up. The idle was really lumpy though, and when i pulled off it just hesitated really bad, rumbling and engine light flashed for a while then went off. I had to slowly accelerated to get up to speed on motorway and so on.

    A couple of weeks ago i did spray 10k boost into the turbo inlet, and the engine was a bag of **** after that, but then it went ok. So not sure if its the MAF i have disturbed?? or could it be the auto gearbox?
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  3. Digger1
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    Digger1 Member

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    [May 8, 2010]
    Doubt it's the multitronic box, if that's the auto you have ?,as you said it's like it when idling !!!
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  4. gadgesxi
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    gadgesxi Member

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    [May 8, 2010]
    yes, revs are up and down on idle.
    auto box is tiptronic also, its the old type
    Last edited: May 8, 2010
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  5. Digger1
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    Digger1 Member

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    [May 8, 2010]
    What engine do you have ? if petrol when did you last change coil-packs ?
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  6. gadgesxi
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    gadgesxi Member

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    [May 8, 2010]
    1.8t I have never changed the coil packs
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  7. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [May 8, 2010]
    My moneys on a coil packs ;)
    #6
  8. Digger1
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    Digger1 Member

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    [May 8, 2010]
    think your find this is your prob; if a coil-packs down your be running on three cylinders...
    simple way to check; unscrew the two torx screws that hold the red wiring loom onto the rocker-cover then whilst the engine is running gently lift the first coil up with a screwdriver,only about an inch,be carefull not to touch underneath the plastic head !:jump:
    if its that one that's not working prop; then it will run the same, if it ticks-over worse then push it back down and try the next one back and so on ,till you find the one where it ticks-over the same as it is now, ie on three cylinders, no worse and no better ...
    Last edited: May 8, 2010
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  9. gadgesxi
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    gadgesxi Member

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    [May 8, 2010]
    red wiring loom? cant remember seeing that. Is that the same for the 1.8T. I will give that a try though!

    If it is coil packs, how much ££ am i looking at?
    #8
  10. Digger1
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    Digger1 Member

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    [May 8, 2010]
    There about £30 each from GSF , about £40 from stealer, very common I've changed two on mine , my dad has a4 petrol I changed one on his just last weekend, it will run exactly as you've described, mines the 2.0FSI, yours may not have the red loom across the rocker cover, but if you check the way I've explained your soon find the culprit !
    Last edited: May 8, 2010
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  11. gadgesxi
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    gadgesxi Member

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    [May 8, 2010]
    Do you mean the socket things the spark plugs plug into?
    #10
  12. Digger1
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    Digger1 Member

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    [May 8, 2010]
    Yes ! It's worth carrying a spare coil-pack in the boot, if ones gone the others won't be far behind ...
    Last edited: May 8, 2010
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  13. gadgesxi
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    gadgesxi Member

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    [May 8, 2010]
    well just tried the car, and it seems ok now. I unplugged a coil pack and it did sound how it was. Maybe its when they have got hot, then their failing? anyway, i will order one, or two!
    #12
  14. gadgesxi
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    gadgesxi Member

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    [May 8, 2010]
    Is this what i need?

    925VG0140
    IGN COIL-PENCIL
    A4 1.8 (AVJ/BFB/AWT/AMB/BEX)
    21.75

    thats from GSF
    Last edited: May 8, 2010
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  15. Digger1
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    Digger1 Member

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    [May 8, 2010]
    I've got the 2.0 FSI, so possibly diff coil to mine, but yes ign coil-pencil is right and if that's the one listed for 1.8, then it should be right ...
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  16. gadgesxi
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    gadgesxi Member

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    [May 10, 2010]
    whilst i wait for the coil pack i bought some spark plugs and have only managed to fit 2 before i snapped the plug removed (cheap halfords thing). Cars still **** with 2 new plugs anyway. Is it possible it could be the air mass meter?

    A fella in work is bringing a fault code reader and a plug remover in tomorrow so may have a better chance.
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  17. a4 2.4 se
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    a4 2.4 se V6

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    [May 10, 2010]
    i had the same fault on my 2.4 v6 revs up and down drove the car for about 30 mile switched engine off for about 5 min now all ok ... can this be an coil pack. im looking changing my spark plug the car have NGK but was looking at putting bosch super 4 . does any one now more about spark plugs that can help also any pic of wat an coil pack looks like ?
    #16
  18. Digger1
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    Digger1 Member

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    [May 11, 2010]
    more likely to be your coil-pack IMO , really common , and like you said you've never changed any ...
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  19. swarcup
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    swarcup Well-Known Member

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    [May 11, 2010]
    i used to play around with different spark plugs when i had a petrol and i always found that ngk triple electrodes where better than bosch super 4's. Just my observations
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  20. gadgesxi
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    gadgesxi Member

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    [May 11, 2010]
    well the car is back to normal now!!! have a guess what the problem was.....?.............a faulty coil on cylinder 1. New coil bought from eurocar parts for 20 quid, and its now back to full glory!
    Thanks for the help guys!
    #19
  21. Digger1
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    Digger1 Member

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    [May 13, 2010]
    Faulty Coil ,,, Why Didn't I Think Off THAT !!! First Of All !!! :)
    Last edited: May 13, 2010
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  22. quattrojames
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    quattrojames Moderator Staff Member Moderator

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    [May 13, 2010]
    :o.k:
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