[V8] Noise under load @ 1800 RPM

[Seamus O'Carey]

It seems like the mounts are good, since I don't notice any excessive
movement, but I'll have to check more closely.

And, yeah, I was hesitant to mention the "other", but I figured since the
shop guy brought it up first I merely quoting someone else.  It's like how
when you're a kid you're allowed to swear as long as you're quoting someone
else!

So is it possible to pull a fuse to disable the center diff or not?

On Thu, Mar 5, 2009 at 6:37 PM, Dave Saad <dsaad at icehouse.net> wrote:

> On the 5-speeds, there is a removable cross member under the car - at
> about the middle of the car.  If you have the same cross member, and
> you have worn out motor mounts (likely) then the drive line clanks on
> the crossmember under hard acceleration and it is very audible in the
> car.  No one outside would hear a thing though.
>
> One easy way to check for worn motor mounts is to look at the "torque
> stop" thing that looks like a motor mount up near the alternator.  If
> that is broken, you need new mounts.
>
> I will ignore the fact that you mentioned scuberdoo in the same
> sentence as V8, but be warned - the Audi gods never sleep....
>
> Dave
>
>
> On Mar 5, 2009, at 7:17 PM, Seamus O'Carey wrote:
>
> > I've been trying to get to the bottom of this noise issue since I
> > bought the
> > car.  I thought maybe it was just a loose exhaust hanger, but I just
> > had it
> > checked out and the entire exhaust system is solid and all the hangers
> > intact.
> >
> > We did discover, though, that the noise comes on only under load
> > (whether
> > accelerating or while standing still with the car in gear) and very
> > suddenly
> > just before 1800 RPM, and goes away a little after 2k.  Inside the
> > car, it's
> > a loud grumble that you can feel through the seat/floorboard.  What
> > confounded us, however, is you can NOT hear the noise from outside
> > the car.
> > Not even a hint of it, even with the window open.
> >
> > The guy at the exhaust shop thought maybe it was coming from the
> > center
> > differential, just behind the transmission (even though he listened
> > to it
> > with a stethoscope and still couldn't hear anything).  He mentioned
> > something about how Subaru owners can pull a fuse that will disable
> > the
> > center differential in their cars, which would help them diagnose
> > something
> > like this.  Do we have something similar in the V8?
> >
> > Seamus
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