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  1. #1
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    Knock driving me crazy!

    Hi all. Been a member for a few months now and have never felt the need to post for help but I am well and truly stumped.

    I have got a slight knock coming from the front drivers side. It not a loud knock and only happens while going over uneven road. I can hear it while going slow but obviously the faster I go the louder the engine gets so I no longer hear it. I have replaced pretty much everything I can think of and I don't know what to do next lol. Thank you for any advice you can give.

    1998 a3 1.8t AGU
    Replaced both wishbones
    Replaced both wishbones bushes to poly
    Replaced drop link arms
    Replaced strut top mounts and bearings
    Replaced anti roll bar bushes
    Replaced both drive shafts

    Additional mods
    Oil catch can
    K04-001
    2.5 inch turbo back exhaust
    Forge tip
    Forge recirc dv

    Remap as soon as this knocking noise is sorted and fmic installed

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  3. #2
    Vex182's Avatar
    Guess what I drive...

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    Brake pads rattle? My rear ones were doing it for months before I found it.
    Silver 2002 Audi S3 225 (BAM) since March 2011.

    Mods: Badger5 2.2 TIP, Jetex filter, PCV delete, 710 DV, Standard N249 in use, R-Tech Stage 1 TiV Remap, Audi TT Pedals, Red Dogbone, Polybushed tie arms. All silicone boost pipes, Michelin PS3s, Red V6 coil packs, MK4 flat blade conversion, retrofited cruise control.
    Currently: 254bhp - 276lb/ft (174bhp/ton) as of 11/02/2013 On V-Power

  4. #3
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    Loose arch liner or belly pan?
    13.015@110 mph on a ko3s

    BEACHBUGGYTURBO
    DMC Performance

  5. #4
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    Brake discs and pads been done. And there is no plastic belly pan on it. It sounds like a dull metal on metal. Its not far off the same sound as a wishbone bush that has gone bad?

  6. #5
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    I recently bought a 2002 S3 and had the same knock over rough ground at low speeds.

    After changing a few bits and pieces I discovered that the drivers side front shock was the culprit. Not only did it have no rebound left in it, the damper was rattling about in the shock body.

    A pair of new dampers later and the jobs a good 'un.

    Cheers.

  7. #6
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    Thanks mate. I will check that out when I get back from lodging. Cheers

  8. #7
    jojo's Avatar
    S3 Drift King!

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    Track rod and ends?



    99' Audi S3(APY) - Brilliant Black Click>>>Going Sideways vid!
    You've got to have a laugh! For Sale:LCR Brakes - £400



  9. #8
    Reverse Gear

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    I have checked them and they are fine

  10. #9
    Grant-s3's Avatar
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    Have a look inside the engine bay incase anything is loose and knocking about. Then jack it up, remove the wheel and gently tap away with a rubber hammer and listen.

  11. #10
    Neutral

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    Wheel bearings?

  12. #11
    Reverse Gear

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    I checked the wheel bearings last weekend and they are ok

  13. #12
    Gops's Avatar
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    I know this sounds obvious.. But is your wheel tight? Mine was slightly loose and I had exactly the same symptoms.. I have no idea how it came loose but I guess it worked its way loose somehow..
    Quote Originally Posted by <tuffty/> View Post
    its either mapped or broken...

  14. #13
    Gops's Avatar
    6th gear @7000rpm

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    Ow and make sure the DV isn't hitting the strut brace.. Happened to me and drove me completely insane for months!!!
    Quote Originally Posted by <tuffty/> View Post
    its either mapped or broken...

  15. #14
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    I haven't got a strut brace mate. Dv not hitting anything. All wheels are tight. I didn't change all these parts in one go so the wheels have been on and off numerous amount of times lol

  16. #15
    4th Gear

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    Cv boot? I had this before

    Does it happen when turning at low speed?

    Try putting it on full lock and have a look to see if cv boot is split, you'll probably see some gunk
    Researching and potentially looking for a nice S4 B6
    Previous cars: Modded Toyota Celica 1.8 Vvtli, modded mk1 TT, standard mkv r32 dsg
    Current: family wagon diesel

  17. #16
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    Its not a cv boot mate. I have replaced both drive shafts with new boots. It happens when going straight and when turning

  18. #17
    jojo's Avatar
    S3 Drift King!

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    Quote Originally Posted by MyCarling View Post
    I have checked them and they are fine
    I checked mine, and they were fine too! but on a Hunters 4 wheel alignment machine, it detected 0.1mm play on the passenger side steering rod!! Changed to a new one, and knocking disappeared.



    99' Audi S3(APY) - Brilliant Black Click>>>Going Sideways vid!
    You've got to have a laugh! For Sale:LCR Brakes - £400



  19. #18
    4th Gear

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    I would second what jojo said, my car was making very similar recently. All new dampers/springs/drop links/top mounts and roll bar bushes which I thought would sort it, but to no avail.

    I replaced the track rods and ball joints more out of desperation than anything, and the noise disappeared. The stuff on there had sailed through the MOT a few weeks ago too, but must have been some play in there somewhere.

    Not sure ultimately whether it was the track rod ends or ball joints, but I did notice a metal rattle sound when I tapped the steering rack arm on one side with a rubber mallet. When I do the same post change, there isn't a sound.
    Audi S3 - 2002MY - Denim Blue - Gone
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  20. #19
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    I will replace them then when I get paid next... I had just persuaded the wife to let me fork out on new shockers and coilovers lol

  21. #20
    Pubemammal's Avatar
    2nd Gear

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    I have this same knocking, also an A3 8L 1.8t. It has starting happening ever since I wound the coilovers down a couple of CM's. Let me know how you get on


    Progress Thread - http://www.audi-sport.net/vb/a3-s3-f...thread%5D.html

    A3 8L 1.8T AGU BLACK

  22. #21
    Pubemammal's Avatar
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    Also, when going very slowly and lightly putting foot on the brake, can you feel it through the brake pedal?


    Progress Thread - http://www.audi-sport.net/vb/a3-s3-f...thread%5D.html

    A3 8L 1.8T AGU BLACK

  23. #22
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    I dont feel it through the brake pedal mate

  24. #23
    RobinJI's Avatar
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    Yep, I'd second track rods/ends, I take it you did the lower ball joints along with the wishbones? Failing that it could be worth adjusting the steering rack.
    1.8 20v turbo converted '88 Scirocco - ASN Build Thread

 

 

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