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  1. #1
    Veteran Member Four Rings morris400's Avatar
    Join Date
    Dec 18 2008
    AZ Member #
    36524
    My Garage
    2007 Jeep Grand Cherokee, 1994 Audi S4
    Location
    Alberta, Canada

    Car is jerking back and forth.

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    when driving normally (ie no boost) i notice that the car is jerking back and forth when i get on the gas and step off the gas. same feeling only worse when boosting. the jerking is very noticalbe to the point where i dont want to drive the S. i know that i have bad control arms with seized tierods and front axles that are going on 2+ years with the boots cut open. i have bad vibrations in the steering wheel, driver side clunks when going over bumps and the alighment is off as the car pulls to the right and the front end has a wobble to it as well. i did some searching tonight and found a few threads which mentioned the engine mounts tranny mounts and rear diff mount as possable suspects but i wanted to get thoughts from the B5 S4 crowd. could the jerking be caused by any of the problems im having now with axles ,control arms and tie rods or would the drive train mounts be the likley suspect? i have 034 track density engine mounts and tranny mounts and the diff mount is stock. on a side note im having new control arms (fcp) and axles (fcp) as well as new tie rods (fcp) installed on the up coming friday.

    Thank you ,

    Kenny
    IF YOU WONT STAND BEHIND OUR TROOPS....TRY STANDING IN FRONT OF THEM!
    1994 Audi S4 20V Turbo - Current DD
    2001 Audi S4 - Gone but never forgotten

  2. #2
    Veteran Member Four Rings Mantis's Avatar
    Join Date
    Aug 04 2007
    AZ Member #
    20072
    Location
    Canada

    Sounds like you have a throttle body boost leak

    check your PM, you should add FMIC to the list of things to do the week
    I don't think I care anymore

  3. #3
    Senior Member Three Rings JWatson's Avatar
    Join Date
    Dec 14 2009
    AZ Member #
    52092
    My Garage
    2001.5 S4 ,1947 Mercury Coupe
    Location
    Rapid City

    Second on the boost leak.
    01.5 S4 (on meth)

  4. #4
    Veteran Member Four Rings morris400's Avatar
    Join Date
    Dec 18 2008
    AZ Member #
    36524
    My Garage
    2007 Jeep Grand Cherokee, 1994 Audi S4
    Location
    Alberta, Canada

    I will have a boost leak test done as well on Friday when the other parts get installed.

  5. #5
    Active Member Two Rings
    Join Date
    May 18 2007
    AZ Member #
    18141
    Location
    NY

    Not an expert by any means but try to swap your MAF unit as well with someone with a working MAF. My car would jerk or stutter all of sudden (on or off boost). After replacing MAF, problem was gone.

  6. #6
    Veteran Member Three Rings VR6Bomber's Avatar
    Join Date
    May 13 2009
    AZ Member #
    42466
    My Garage
    '12 ABARTH - 90TQ aan'd 3071'd
    Location
    HERE

    Un-metered air getting in, pressure test your intake tract.

  7. #7
    Veteran Member Four Rings morris400's Avatar
    Join Date
    Dec 18 2008
    AZ Member #
    36524
    My Garage
    2007 Jeep Grand Cherokee, 1994 Audi S4
    Location
    Alberta, Canada

    the car will only jerk during shifting. when i take my foot off the gas the car will jerk forward when i push the gas it will jerk backwards. when i start to go from a stop its the same thing. the car was not jerk when im crusing or driving at a steady pace. only when i have to take my foot on or off the gas. still boost leak?
    IF YOU WONT STAND BEHIND OUR TROOPS....TRY STANDING IN FRONT OF THEM!
    1994 Audi S4 20V Turbo - Current DD
    2001 Audi S4 - Gone but never forgotten

  8. #8
    Senior Member Three Rings
    Join Date
    Mar 10 2009
    AZ Member #
    39706
    Location
    il

    AH, that forward and backward 'jerking' as you describe it, is called lateral acceleration and deceleration. It happens when you play with the go-fast pedal.

  9. #9
    Veteran Member Four Rings morris400's Avatar
    Join Date
    Dec 18 2008
    AZ Member #
    36524
    My Garage
    2007 Jeep Grand Cherokee, 1994 Audi S4
    Location
    Alberta, Canada

    Quote Originally Posted by TipTucker01 View Post
    AH, that forward and backward 'jerking' as you describe it, is called lateral acceleration and deceleration. It happens when you play with the go-fast pedal.
    that i know but of late there has been alot more slop during acceleration and deceleration.
    IF YOU WONT STAND BEHIND OUR TROOPS....TRY STANDING IN FRONT OF THEM!
    1994 Audi S4 20V Turbo - Current DD
    2001 Audi S4 - Gone but never forgotten

  10. #10
    Senior Member Two Rings Cobra Commander's Avatar
    Join Date
    Nov 17 2010
    AZ Member #
    67140
    My Garage
    D3 S8- Daytona Gray
    Location
    Philadelphia

    Might it have something to do with your engine/tranny mounts? I have the same jerky and plan on tackling my mounts first...from past experience putting in firmer/newer mounts can reduce/eliminate such play...of course your other issues don't help either.
    2001.5 B5 S4-Silver |Vogtlands|PODI|Dice|
    2007 D3 S8- Daytona Gray

  11. #11
    Senior Member Two Rings xmoox's Avatar
    Join Date
    Aug 11 2008
    AZ Member #
    31860
    My Garage
    2000 audi s4
    Location
    Portland OR

    to me it sounds like drive-train slop like rear diff if it doesn't happen under boost. Thats what I think anyway. hold your hand on the shifter does it move around a lot when u decel and accel no boost just light throttle. Could be one of your mounts are loose?
    Moo
    Come join us in Audizine chat
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  12. #12
    Stage 3 Forum Advertiser Four Rings ECS Tuning-Audi's Avatar
    Join Date
    Oct 02 2006
    AZ Member #
    70746
    Location
    Wadsworth,OH

    When you say "jerking", do you mean more of surging, or of a clunk back and forth? The vibration could be a combination of things if the parts you listed are worn that badly. I had wheel shake and some bad vibrations while driving before I replaced my control arms and tie rods on my B5. Track density engine mounts will also cause vibration since they are stiffer then OEM. That being said, you'll be able to rule out some things next Friday.

  13. #13
    Veteran Member Four Rings morris400's Avatar
    Join Date
    Dec 18 2008
    AZ Member #
    36524
    My Garage
    2007 Jeep Grand Cherokee, 1994 Audi S4
    Location
    Alberta, Canada

    The added vibrations from my motor mounts and trans mounts does add vibrations but I have not really noticed it with the added vibrations from not running a exhaust from the cats back. To be if feels like a loose or broken trans mount. The shifter knob does move around a bit when I accel and decel but I assumed it was cause my trans is messed. Real rough 1 2 shift I get the jerk back and forth even by just taping the gas pedal but yes I guess I will be able to eliminate some things on Friday when I get the other parts installed.

  14. #14
    Veteran Member Four Rings morris400's Avatar
    Join Date
    Dec 18 2008
    AZ Member #
    36524
    My Garage
    2007 Jeep Grand Cherokee, 1994 Audi S4
    Location
    Alberta, Canada

    just got the car back tonight. had my new Axles ,tie rods and control arms all from FCP installed this weekend,also had my oil changed and my headlight washers disabled. car is much smoother BUT i still have a bad wobble in the steering wheel. i hope a wheel balance and alighment will fix it. also found the the jerking is caused by my pasenger side trans mount (034 track density), the front bolt is missing and fell off.
    IF YOU WONT STAND BEHIND OUR TROOPS....TRY STANDING IN FRONT OF THEM!
    1994 Audi S4 20V Turbo - Current DD
    2001 Audi S4 - Gone but never forgotten



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