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Knock driving me crazy!

Discussion in 'A3/S3 Forum (8L Chassis)' started by MyCarling, Nov 14, 2013.

  1. MyCarling
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    MyCarling New Member

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    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 :)
    #1
  2. Vex182
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    Vex182 Guess what I drive...

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    Brake pads rattle? My rear ones were doing it for months before I found it.
    #2
  3. bazf
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    bazf New Member

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    Loose arch liner or belly pan?
    #3
  4. MyCarling
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    MyCarling New Member

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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?
    #4
  5. bentescort
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    bentescort New Member

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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.
    #5
  6. MyCarling
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    MyCarling New Member

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    Thanks mate. I will check that out when I get back from lodging. Cheers
    #6
  7. jojo
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    jojo S3 Drift King! Staff Member Moderator

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    Track rod and ends?
    #7
  8. MyCarling
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    MyCarling New Member

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    I have checked them and they are fine
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  9. Grant-s3
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    Grant-s3 Nogaro Blue

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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.
    #9
  10. ticketyboo90
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    ticketyboo90 Member

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    Wheel bearings?
    #10
  11. MyCarling
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    MyCarling New Member

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    I checked the wheel bearings last weekend and they are ok
    #11
  12. Gops
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    Gops 6th gear @7000rpm

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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..
    #12
  13. Gops
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    Gops 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!!!
    #13
  14. MyCarling
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    MyCarling New Member

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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
    #14
  15. p1tse
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    p1tse Member

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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
    #15
  16. MyCarling
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    MyCarling New Member

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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
    #16
  17. jojo
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    jojo S3 Drift King! Staff Member Moderator

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    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.
    #17
  18. Tooks
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    Tooks Member

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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.
    #18
  19. MyCarling
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    MyCarling New Member

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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
    #19
  20. Pubemammal
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    Pubemammal Member

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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 :)
    #20
  21. Pubemammal
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    Pubemammal Member

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    Also, when going very slowly and lightly putting foot on the brake, can you feel it through the brake pedal?
    #21
  22. MyCarling
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    MyCarling New Member

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

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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.
    #23

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