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    Thread: 2.8 quattro vibrating when accelerating (opinions please)

    1. Junior Member agregano's Avatar
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      04-17-2012 08:57 PM #1
      today i jacked my car and looked at the motor mounts, none of them seemed to be cracked, the engine has no check engine light on the dash, and runs smooth besides the vibration (;

      the car vibrates through the floor, doors and not so much the steering wheel. The vibration happens between 2k-3500 rpms. its only while accelerating, when i take my foot off the gas it goes away as if i was coasting. Im guessing ill just have to replace both axles and see what happens? any info comment on what you think! thanks guys

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      04-17-2012 09:02 PM #2
      check your cv boots. they tear often, dry out and cause the vibration. If that is your problem do not buy cheap replacements, they won't hold up for ****. FCP Groton has decent axles that aren't dumb expensive

    3. Junior Member agregano's Avatar
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      04-17-2012 09:05 PM #3
      Quote Originally Posted by CELison View Post
      check your cv boots. they tear often, dry out and cause the vibration. If that is your problem do not buy cheap replacements, they won't hold up for ****. FCP Groton has decent axles that aren't dumb expensive

      i slightly looked at the boots today there is no visible tears with grease leaking. maybe it happened before i bought the car and was never replaced... could i get a link to the ones youre talking about? thanks! what about like autozones axles

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      04-17-2012 09:06 PM #4
      Quote Originally Posted by agregano View Post
      i slightly looked at the boots today there is no visible tears with grease leaking. maybe it happened before i bought the car and was never replaced... could i get a link to the ones youre talking about? thanks! what about like autozones axles
      http://www.fcpgroton.com do not buy axles from autozone.
      b5 12v 2.8
      F21 Stage 3+ B5 S4

    5. Junior Member agregano's Avatar
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      04-17-2012 09:07 PM #5
      Quote Originally Posted by CELison View Post
      http://www.fcpgroton.com do not buy axles from autozone.
      thanks for the heads up!!

    6. Junior Member agregano's Avatar
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      04-18-2012 11:04 PM #6
      today i was under the car and realized i could push and pull the axles from side to side about an eighth of an inch is that normal or would that cause some vibration (;

    7. Junior Member agregano's Avatar
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      04-26-2012 02:53 PM #7
      bump.. car only vibrates when trying to accelerate? i need to figure this out

    8. Member thepirate's Avatar
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      04-26-2012 08:22 PM #8
      Is it lowered? auto or mt? Bad alignment will make the car vibrate at low speeds. The axle should have some play in them. If your car is really low or has crap autozone axles on it it may be that.

    9. Junior Member agregano's Avatar
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      04-26-2012 10:35 PM #9
      Car is on stock suspension, has a manual tranny and hasn't been ALIGNED recently.

    10. 04-27-2012 12:53 AM #10
      Try rotating the tires. I was running some Falkens and for some reason they made my car feel like a rolling massage chair. Rotated tires and it went away.
      Good luck man.

    11. Junior Member agregano's Avatar
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      04-27-2012 07:32 AM #11
      Yea ill probably try that next since it costs nothing haha. What is the mount from the engine into the rad called? It's like a little snub and has a rubber bushing that practically is gone. Would that cause any vibration?

    12. Member thepirate's Avatar
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      04-27-2012 09:08 AM #12
      Snub mount would cause vibrations. I'd replace it if its completely gone. Also get a tire rotation, balance, and alignment.

    13. Junior Member agregano's Avatar
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      04-27-2012 09:12 AM #13
      Is the mount into the rad called a snub mount?

    14. Member thepirate's Avatar
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      04-27-2012 09:25 AM #14
      Quote Originally Posted by agregano View Post
      Is the mount into the rad called a snub mount?
      Yes.

    15. Junior Member agregano's Avatar
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      04-27-2012 10:23 AM #15
      Would it cause vibration when accelerating

    16. Junior Member agregano's Avatar
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      04-29-2012 11:15 PM #16
      When the car is cold I don't get the vibration could this relate to tranny fluid? Bumpt

    17. Member thepirate's Avatar
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      04-30-2012 08:33 AM #17
      Quote Originally Posted by agregano View Post
      Would it cause vibration when accelerating
      You said the snub mount was toast, well the snub mount is a motor mount, when you accelerate the engine torques which can cause vibrations in the body of the car and not the steering wheel. Bad inner axle joints will do the same, vibrations through the car and not the wheel. If its an MT and you have low fluid I would think it would be slipping out of gear? I have an auto when its low on fluid the trans goes into "limp mode" cause it not to shift out of 2nd gear so the trans won't get damaged.

    18. Junior Member agregano's Avatar
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      04-30-2012 10:57 AM #18
      Quote Originally Posted by thepirate View Post
      You said the snub mount was toast, well the snub mount is a motor mount, when you accelerate the engine torques which can cause vibrations in the body of the car and not the steering wheel. Bad inner axle joints will do the same, vibrations through the car and not the wheel. If its an MT and you have low fluid I would think it would be slipping out of gear? I have an auto when its low on fluid the trans goes into "limp mode" cause it not to shift out of 2nd gear so the trans won't get damaged.
      yes true. i think its the snub mount. i bought axles and still havent put them in but i am going to purchase a snub mount and replace that first because i just looked and there isnt one there really haha its gone

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      04-30-2012 05:57 PM #19
      Check inner CV joints on the front, grab them and if they have movement back and forth they are worn. happened to me and i replaced both front axles and vibration went away. hope this helps

    20. Junior Member agregano's Avatar
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      04-30-2012 08:04 PM #20
      Quote Originally Posted by audiurleeg View Post
      Check inner CV joints on the front, grab them and if they have movement back and forth they are worn. happened to me and i replaced both front axles and vibration went away. hope this helps
      thank you! which way should they not move back and forth?

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      05-09-2012 07:16 PM #21
      check drive shaft alignment.. my car would vibrate as i accelerated as well.. was was extremely bad at high way speeds.. the p/o of my car did the clutch him self and never properly aligned the drive shaft... it needs to be so precise Audi has to use a laser to align it..caused me a ton of headaches and money on pointless sh** i didn't need

    22. Junior Member agregano's Avatar
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      05-10-2012 07:27 PM #22
      Quote Originally Posted by BMXican37 View Post
      check drive shaft alignment.. my car would vibrate as i accelerated as well.. was was extremely bad at high way speeds.. the p/o of my car did the clutch him self and never properly aligned the drive shaft... it needs to be so precise Audi has to use a laser to align it..caused me a ton of headaches and money on pointless sh** i didn't need
      car doesnt vibrate at all at highway speeds

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