Automatic gearbox j...
 

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[Closed] Automatic gearbox judder help please, Audi A6

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Hi,

I've got a 54 1.9tdi avant and recently when i pull away from stopped, at a steady pace there's a slight judder which i presume is gearbox related, like a slight kangerooing you'd get from letting the clutch out too quick on a manual gearbox.

If i put my foot down and pull away fast it doesn't seem to happen.

Any help or suggestions please as the cars still under warranty.

thanks

Simon

Ps i've posted on a couple of audi forums but have had no responses


 
Posted : 25/05/2009 10:07 am
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Do you know what type of auto transmission it is? Is it a conventional auto, or is it a CVT (continually variable transmission), or a DCT (dual clutch transmission)?

I'm not fully coherant with the exact operation of conventional autos/CVT's during launch, but the torque converter is the launch device on these types of transmissions, and I guess it would be odd getting shudder through a torque converter.

If it is a DCT I would suggest a clutch oil and filter change as your first course of action, as contamination of the clutch valves wouldn't help. Other thing could be a damaged clutch, which I would push to get changed under warranty if I were you as replacement clutches aren't cheap on a DCT.

Other option of course is an engine misfire.


 
Posted : 25/05/2009 5:17 pm
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Back when I had a crap car with a conventional automatic gearbox, the traditional advice for any initial problem was to change the Automatic Transmission Fluid. It works a lot of the time and even if it doesn't, it's still a good thing to do and relatively cheap.

But I have no idea whether that would help you here.


 
Posted : 25/05/2009 11:24 pm
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Edit: if it does have ATF, how does it smell and what does it look like? New ATF looks like Ribena and smells OK, burned/old ATF looks like chocolate milkshake and smells terrible.


 
Posted : 25/05/2009 11:25 pm
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thanks guys, i don't know what type it is, it's also tiptronic if thats helps? I'm playing safe and it's going into audi tomorrow.


 
Posted : 27/05/2009 3:50 pm