[V8] Noise under load @ 1800 RPM

[Dave Saad]

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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