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loud knocking from rear

Discussion in 'A3/S3/Sportback (8P Chassis)' started by FranA3, Mar 18, 2011.

  1. FranA3
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    FranA3 events moderator Regional Rep

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    i fitted coilovers this week they are great i love them but now i have got a really loud knocking noise from the rear suspension somewhere, is it something to do with the coilovers or have i fitted them wrong i cant see it being wrong fitting as you can only fit them one way help please , the noise sound like metal on metal its doing my nut in already could it have been a bush going but failed now its under more strain anybody got any idea's :sos::sos::sos:
    Last edited: Mar 18, 2011
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  2. Lings
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    Lings Active Member

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    when you removed the old springs theres a rubber washer pretty large on the top where the adjusters go ..You cant fit the washer with the adjusters, so i would think it could be there where the metal on metal noise is coming from ?
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  3. FranA3
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    FranA3 events moderator Regional Rep

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    i cut the old rubber washer and put it back on to see if it was that its still exactly the same noise im confused lol
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  4. Lings
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    Lings Active Member

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    where have you put the adjusters?
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  5. FranA3
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    FranA3 events moderator Regional Rep

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    up top of the springs is that right or do they go at the bottom dont say ive messed it up lol
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  6. Lings
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    Lings Active Member

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    No they can only go at the top .i meant have you dropped them low as they can go .One other thing is the noise both sides or one side?
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  7. FranA3
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    FranA3 events moderator Regional Rep

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    ive set them so there is no thread showing at the bottom of the adjuster with about half an inch of thread showing on the top so im guessing about half way ish , i cant tell properly it does sound more from one side to the other ie more towards the drivers side than the passenger side but its hard to tell
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  8. Lings
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    Lings Active Member

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    I had the same, i forgot to tighten the shock and it was clunking .check that mate ..
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  9. FranA3
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    FranA3 events moderator Regional Rep

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    you say tighten the shock how do you mean mate the nut in the middle ?? could there be something ive forgoten to take off the old shocks dont think i missed anything , how i fitted them undid the nut in the middle took off the mountings along with bumpstops fitted them to new shocks
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  10. Lings
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    Lings Active Member

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    The lower bolt that attaches to the hub ..
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  11. FranA3
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    FranA3 events moderator Regional Rep

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    lol i put that back on i dont think i could drive it without it
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  12. Lings
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    Lings Active Member

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    Yes but did you torque it up ?
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  13. FranA3
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    FranA3 events moderator Regional Rep

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    i was using air tools does that make a difference to it do you know
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  14. Lings
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    Lings Active Member

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    How did you get an airgun on that bolt?One other thing did you screw the spring down into the bottom properly ?
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  15. FranA3
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    FranA3 events moderator Regional Rep

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    i fitted the shock before the spring , i dropped the spring down to get at the bolt for the shock with the air gun , yeah as far as im aware its in the rubber seat ok i put it on the rubber seat then turned it so it went against the stop where the old spring was
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  16. TimG
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    TimG Member

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    When I had coilovers on my TT the rear adjuster fitted at the top of the spring located over a 'bump' on the chassis & it was tightened with little screws to stop it from moving (Im not sure if the A3 adjuster fits in the same way). When I removed part of the adjuster to get lower, it no longer fitted tightly over this 'bump' & knocked as a consequence.

    Thought it was worth a mention.
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  17. FranA3
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    FranA3 events moderator Regional Rep

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    ok so i had a quick look through the boxes to see if i had missed anything off and ive found two plastic caps that go on top of the shock could this be the reason for the knocking , im going to check all the bolts and nuts by hand today as air tools can never be guaranteed can they so will try and turn them all another half a turn or so to see if any of them turn at all
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  18. FranA3
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    FranA3 events moderator Regional Rep

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    yeah there is a bump in the chassis but no screws to hold it in place just the spring holds it on , i even cut the old rubber top mount for the spring and put it back on to see if that made a difference but it was exactly the same
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  19. TimG
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    TimG Member

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    Is there ANY movement in the adjuster and the 'bump' where it locates? Literally the smallest gap will allow the spring to rattle the adjuster against that bump. It produced a much louder knocking noise than I would have thought.

    I solved it by wrapping some insulating tape around the bump to make sure the adjuster was a real tight fit.
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  20. FranA3
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    FranA3 events moderator Regional Rep

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    yeah i think there is movement there does it make a differnce that i put the rubber mounts back on as there is prob more movement now isnt there as they are sitting another couple of mm further down ?
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  21. TimG
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    TimG Member

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    Yes. If its the same as the TT putting those rubber bits back in the top will push the adjuster down & further away from the bump & increase the amount of gap for it to rattle! It needs to fit snug so it doesnt move ;)
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  22. FranA3
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    FranA3 events moderator Regional Rep

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    ah right i get you i'll take them back out and get some tape on them to see if that makes any difference , any tape /gaffer tape as its more sticky or like you say insulation tape
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  23. TimG
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    TimG Member

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    Something hard wearing as the movement will eventually wear the tape through. I think I used insulating, but duck might be better/ tougher.

    Strange that they dont fit snug though TBH if they are the correct fitment for the car. Mine only rattled as I removed half of the adjuster for extra lows, so I wasnt running the threaded part that fits nice and tight over the bump :)
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  24. FranA3
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    FranA3 events moderator Regional Rep

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    yeah its the right kit for the car prob just badly fitting so as you say its rattling around on there i hope your right as i dont want to have to take them back off i love the new looks of my car lol thanks for all the advice i'll get back to you later on when ive had a go at them
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  25. TimG
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    TimG Member

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    No probs, let me know how you get on.
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  26. FranA3
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    will do mate cheers
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  27. FranA3
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    still banging mate put some gaffer tape round it still no avail all the bolts are tight , its better but still making a noise the only thing i can think of now is the plastic caps ontop of the shocks failing that its bad parts as i'll be out of ideas what to check
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  28. Lings
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    Lings Active Member

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    Put them plastic washers on the top of the shock .Mine are fantastic .Abetter ride than OEM .Hot tuning LOL yeah baby £100
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  29. FranA3
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    FranA3 events moderator Regional Rep

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    yeah im gunna do that 2moz , yeah mine are too such a nice ride compaired to the shite standard sport set up
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  30. N8
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    N8 Kowalski Details

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    Let us know Fran, somethings not fitted right as my friends V-Maxx are quiet as a mouse and smooth as you want :happy:
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  31. FranA3
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    FranA3 events moderator Regional Rep

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    they are smooth as hell to be fair they are just making a horrible noise lol
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  32. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator

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    It's more likely the top mounts. Seems to be a common thing for coilovers to have thinner shafts than the OEM shocks so that the spacers and washers that reside on top of the shock don't sit correctly.
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  33. FranA3
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    FranA3 events moderator Regional Rep

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    how would i fix that mark ??
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  34. FranA3
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    FranA3 events moderator Regional Rep

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    im going to try the oem shocks on the car today to see if that makes any difference as i know they were not making a sound before i took them off just to eliminate that
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  35. Lings
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    Lings Active Member

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    Is it definately both sides?And have you fitted the old bump stops or the new ones?
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  36. flying oyster
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    flying oyster flying oyster

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    take the girlfriend out the boot and i think your find the banging will stop lol
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  37. FranA3
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    FranA3 events moderator Regional Rep

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    yeah its both side nothing is loose checked it all today BUT when i took the rear springs out i noticed that the adjusters are loose on the threads could this be the problem im going to wind the adjusters all the way down 2morow so they have no threads showing to see as they seam a bit loose to me , fitted the new bump stops
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  38. FranA3
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    FranA3 events moderator Regional Rep

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    LMFAO if only matey
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  39. flying oyster
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    flying oyster flying oyster

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    is their a guide for fitting coilovers ???
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  40. FranA3
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    FranA3 events moderator Regional Rep

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    nope not in the box
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