[s-cars] A8 tranny problem?

[Cody Forbes]

Oh geez, just because I'm the only person here dumb enough to  
disassemble one of these things and lucky enough to have it work again  
now I'm the expert? Ok, ok, I guess I'm the next best thing.

Diagnosing should be cake with a VAG-Com. Codes come first. Then you  
can use the measuring blocks to view the output of the ECU which  
includes gear selector position and ECU requested gear. Then you can  
check the solenoids with the output tests.

There's a switch on the side of the transmission that tends to fail  
and cause plenty of issues. It's output can be viewed on the measuring  
blocks.

Internally it seems complicated, but it's fairly simple in reality.  
Most internal failures will result in a lack of movement rather then  
being stuck in one gear. If one valve or solenoid is stuck then the  
trans would lock itself up when it tried to select another gear.  
Failed or worn clutches, or a stuck pressure relief valve (like mine)  
will result in no movement.

-Cody (mobile)

On Feb 7, 2010, at 5:44 PM, "Wylie Bean" <theringmeister at triad.rr.com>  
wrote:

> Cody Forbes is your huckleberry on this one...
> Wylie Bean
> TheRingmeister at triad.rr.com
> 90 cq
> 91 90q20v
> 92 UrS4
> 08 Q7 3.6
> Sent on the Sprint® Now Network from my BlackBerry®
>
> -----Original Message-----
> From: Steve Powers <sbpowers at gmail.com>
> Date: Sun, 7 Feb 2010 14:23:39
> To: S-Cars<s-car-list at audifans.com>
> Subject: [s-cars] A8 tranny problem?
>
> A friend has found a 97/98? A8 with its tranny stuck in 5th gear. He's
> wondering if it's really a tranny issue or whether it's a problem in
> some controller.
> If the latter, will VAG-COM show which? He's interested in the car but
> not if it's going to cost thousands to fix.
>
> Any knowledge here?
>
> Thanks.
>
> Steve Powers
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