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  1. #1
    Veteran Member Three Rings
    Join Date
    Jan 17 2007
    AZ Member #
    14926
    My Garage
    1994 Single Turbo RX7
    Location
    Los Gatos, CA

    Loud knocking when getting off accelerator?

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    So I have nooo idea what this problem could be. I just recently got aftermarket rotors and brake pads installed and went back to my stock s4 wheels. I'm pretty sure that it isn't the problem, but basically I was driving around and noticed a loud "knocking" sound at all speeds. I first heard it on the freeway but it was only when I would let off the gas it would start making that sound. Whenever I'd get on the gas or whenever I'd break, it would stop. When I am at a dead stop, no knocking either. I have no idea where to even start looking but has anyone had this problem before?
    Current Cars:
    2000 Miata:
    1990 Miata: T28 Turbo
    2012 Mazdaspeed3: Stage 1
    Past Cars:
    2005 GTO: Headers, suspension, wheels, etc. - Not tuned/dyno'd yet
    1994 RX7: A-Spec 500R Single Turbo
    2000 S4: Stage 3
    2005 GTO: Headers, cam, suspension, wheels, etc - 423rwhp/387rwtq
    1994 RX7: All bolt-ons for stock twin turbos, suspension, wheels, etc - 320rwhp/290rwtq

  2. #2
    Veteran Member Four Rings awdjunkies's Avatar
    Join Date
    Dec 18 2005
    AZ Member #
    9274
    My Garage
    sedan, avant, truck/suv
    Location
    nevada

    Could be your engine mounts, tranny mount, or your snub mount. if not try front suspension bits..

  3. #3
    Veteran Member Three Rings
    Join Date
    Jan 17 2007
    AZ Member #
    14926
    My Garage
    1994 Single Turbo RX7
    Location
    Los Gatos, CA

    I feel like it started right after I've hit a pot hole. I believe it only is coming from the front right side of the car.
    Current Cars:
    2000 Miata:
    1990 Miata: T28 Turbo
    2012 Mazdaspeed3: Stage 1
    Past Cars:
    2005 GTO: Headers, suspension, wheels, etc. - Not tuned/dyno'd yet
    1994 RX7: A-Spec 500R Single Turbo
    2000 S4: Stage 3
    2005 GTO: Headers, cam, suspension, wheels, etc - 423rwhp/387rwtq
    1994 RX7: All bolt-ons for stock twin turbos, suspension, wheels, etc - 320rwhp/290rwtq

  4. #4
    Veteran Member Three Rings
    Join Date
    Jan 17 2007
    AZ Member #
    14926
    My Garage
    1994 Single Turbo RX7
    Location
    Los Gatos, CA

    bump
    Current Cars:
    2000 Miata:
    1990 Miata: T28 Turbo
    2012 Mazdaspeed3: Stage 1
    Past Cars:
    2005 GTO: Headers, suspension, wheels, etc. - Not tuned/dyno'd yet
    1994 RX7: A-Spec 500R Single Turbo
    2000 S4: Stage 3
    2005 GTO: Headers, cam, suspension, wheels, etc - 423rwhp/387rwtq
    1994 RX7: All bolt-ons for stock twin turbos, suspension, wheels, etc - 320rwhp/290rwtq

  5. #5
    Veteran Member Four Rings
    Join Date
    Sep 11 2009
    AZ Member #
    47633
    Location
    NE
    Items for Sale

    Well, jack up the car and inspect suspension then... sounds like your control arm maybe?

  6. #6
    Active Member One Ring DocS4's Avatar
    Join Date
    Apr 26 2010
    AZ Member #
    58202
    Location
    Charlotte

    I've been having pretty much the same problem, but on the driver's side. It turns out the bushings on the driver's front upper rear control arm are shot, letting it knock against the bracket. That's where'd I'd start looking. GL!
    2002 Stage 2 Laser Red S4

  7. #7
    Senior Member Three Rings shadwarr1's Avatar
    Join Date
    Apr 16 2008
    AZ Member #
    27769
    My Garage
    2000 S4
    Location
    Gig Harbor, WA

    Quote Originally Posted by julex View Post
    Well, jack up the car and inspect suspension then... sounds like your control arm maybe?

    Quote Originally Posted by DocS4 View Post
    I've been having pretty much the same problem, but on the driver's side. It turns out the bushings on the driver's front upper rear control arm are shot, letting it knock against the bracket. That's where'd I'd start looking. GL!
    THESE
    2000 S4 6MT Brilliant Black ~Low Flyer~ Stage 3- stuff

  8. #8
    Veteran Member Three Rings
    Join Date
    Jan 17 2007
    AZ Member #
    14926
    My Garage
    1994 Single Turbo RX7
    Location
    Los Gatos, CA

    Thanks a lot guys I'll go ahead and get it checked out. I know when i was driving today for a good period it stopped so I now have no idea what it could be. It'll only happen every now and then now but it looks to be possibly the control arms or bushings? Hopefully not an expensive fix!
    Current Cars:
    2000 Miata:
    1990 Miata: T28 Turbo
    2012 Mazdaspeed3: Stage 1
    Past Cars:
    2005 GTO: Headers, suspension, wheels, etc. - Not tuned/dyno'd yet
    1994 RX7: A-Spec 500R Single Turbo
    2000 S4: Stage 3
    2005 GTO: Headers, cam, suspension, wheels, etc - 423rwhp/387rwtq
    1994 RX7: All bolt-ons for stock twin turbos, suspension, wheels, etc - 320rwhp/290rwtq

  9. #9
    Veteran Member Three Rings 1sadavant's Avatar
    Join Date
    Jun 21 2005
    AZ Member #
    6962
    My Garage
    '01.5 S4 Imola
    Location
    Philadelphia, PA
    Items for Sale

    Same thing happened to me, hit pot hole, put a dent in my rim, bulge in my tire, and now this knocking in my driver's side wheel well when I accelerate from a stop or let of the accelerator. Still trying to track it down.
    2001.5 Audi S4 6spd ASP Stg 3 Imola

  10. #10
    Veteran Member Four Rings RolledMySTi's Avatar
    Join Date
    Jul 06 2007
    AZ Member #
    19342
    My Garage
    2001 S4 Sedan Laser Red
    Location
    San Jose, CA

    Make sure your lug nuts are tight.
    01 Laser Red S4 Stage 3 | Vast Fueling | Clutchnet 6 Puck Disk with RS4 PP | APR Downpipes | Neuspeed Exhaust | SRM Side Mounts | ECS Pulley Kit | RS4 Airbox | UUC Short Shifter | ST Coilovers| Samcos | AWE DTS Bar | JHM Center Diff | 034 Track Motor Mounts + Street Trans Mounts |Apikol blue rear diff mount and bushings | Areomotive Fuel Pump | Hooked on Meth

    Junk I have for sale:
    Never used spare tire Stock 154k mile fuel pump
    Tool kit with ECS metal wheel hanger 3 Samco IC hoses

  11. #11
    Active Member One Ring DocS4's Avatar
    Join Date
    Apr 26 2010
    AZ Member #
    58202
    Location
    Charlotte

    I got mine for around $100 from ECS, if that helps. It's the whole control arm piece.
    2002 Stage 2 Laser Red S4

  12. #12
    Veteran Member Three Rings
    Join Date
    Jan 17 2007
    AZ Member #
    14926
    My Garage
    1994 Single Turbo RX7
    Location
    Los Gatos, CA

    This car seems to like to correct itself lol

    I went ahead and tightened to lug nuts on all 4 wheels and well, no more rattling/sound. Dead silent.

    I'll be keeping an eye out for if it comes back, but I am pretty happy that it was just as simple as that...*knock on wood*
    Current Cars:
    2000 Miata:
    1990 Miata: T28 Turbo
    2012 Mazdaspeed3: Stage 1
    Past Cars:
    2005 GTO: Headers, suspension, wheels, etc. - Not tuned/dyno'd yet
    1994 RX7: A-Spec 500R Single Turbo
    2000 S4: Stage 3
    2005 GTO: Headers, cam, suspension, wheels, etc - 423rwhp/387rwtq
    1994 RX7: All bolt-ons for stock twin turbos, suspension, wheels, etc - 320rwhp/290rwtq



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