[s-cars] got a new sound

[Rit Bellis]

I had that happen too on my s4

--------------------------------------------------
From: <calvinlc at earthlink.net>
Sent: Sunday, March 16, 2008 4:32 PM
To: "chris chambers" <fastscirocco_2000 at yahoo.com>; "Mike Fitton" 
<rfitton at vt.edu>; "s-car-list" <s-car-list at audifans.com>
Subject: Re: [s-cars] got a new sound

> Mike,
>
> I had a wierd sound that heppned to me after I changed the brakes on a car
> once and it was coming from one side of the car.  I thought great, I just
> screwed something up on the brake job...but what, because I had driven for
> like a week before I heard the sound.  It turned out that I had gotten a
> pebble stuck between the caliper carrier and the rotor.  It was an awful
> screeching sound, but I would bet that if you got something of a different
> material stuck between the caliper carrier and the rotor it could make a
> different sound that would vary with speed.  It was kind of hard to spot 
> as
> it was on the back side.  I kind of doubt this is it for you, but it's 
> worth
> a look-see.
>
> --Calvin
>
>
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com]On Behalf Of chris chambers
> Sent: Sunday, March 16, 2008 10:46 AM
> To: Mike Fitton; s-car-list
> Subject: Re: [s-cars] got a new sound
>
>
> Mike,
>
> if it increases with ground speed and not RPM I wouldn't look at the
> trans.
>
> I had a strange noise that increased with ground speed and it
> ended up being the LF caliper had "lost" of of the retainin bolts
> which allowed the caliper to pivot partly out of the carrier.
>
> I'd start with axles, prop shaft, wheel bearings and I would
> check the brake pads for drag.
>
> HTH
> Chris
>
>
>
>
>
>
>
> --- Mike Fitton <rfitton at vt.edu> wrote:
>
>> And I'm at a total loss.  It's a very clean vibration.  Don't feel
>> it,
>> only hear it.  Frequency rises with ground speed.  Amplitude varies.
>> I
>> don't hear it below about 20mph and not above about 65mph.  It's
>> loudest
>> around 50-55mph.
>>
>> I've ruled out everything engine by turning the engine off at 55mph
>> in
>> neutral.  Stick and clutch position don't change anything.  Steering
>> wheel doesn't change anything.  Wheel bearings all pass the
>> autocrosser's tech inspection test.  All CV boots are tear-free as
>> far
>> as I can tell, and none of the usual grease sling that comes with
>> torn
>> boots.  No perceptible alignment changes.  No corollary bugs at all
>> that
>> I've noticed.
>>
>> About two months ago, I changed out my transmission oil (finally).
>> Amsoil's synthetic 75W90 GL4.  All the plugs are still tight and the
>> stick still feels great.  The sound started very suddenly about a
>> week
>> ago, so I'm guessing it's not that.
>>
>> Two weeks ago (one week before the sound started) I switched back to
>> my
>> summer tires.  Drove on those just fine for the first week.
>> Pressures
>> are consistent.  Verified lug torque at 90 lb-ft for all 20.  Rotated
>>
>> them anyway with no change.  Tires and wheels all look fine, and no
>> feeling of imbalance in the drivetrain.
>>
>> All I can think of is the prop shaft center bearing.  I've never
>> experienced that before, so I don't know how it should sound.  I
>> played
>> with my prop shaft (no Krausky, not like sexually; or at least not
>> right
>> then) and found a little front to back play which seems like it would
>> be
>> normal with a CV joint on either side.  The two halves seem to move
>> equally during this exercise.  There's also a little play
>> perpendicular
>> to the shaft at the center - that is, I can bend it
>> up/down/left/right a
>> little at the center U joint.  I never did that before, so I don't
>> know
>> what's normal there.  But it seems to me like it shouldn't do that,
>> so
>> that's my best guess so far.
>>
>> But before I give up on diagnosis and resort to just throwing parts
>> at
>> it, I want some second opinions.  Anyone?  Bueller?
>>
>> -Cheers!
>> Mike
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>>
>
>
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>
>
>
>
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