Questions regarding transmission/driveline

stellick · 05-07-2012, 09:28 AM

Hello!

I've got a 2000 A6 Avant Tiptronic Automatic with some fun things I have to diagnose and fix, related to the driveline and the transmission. I was hoping some of you might point me in the right direction and save some troubleshooting time for me. Here's the background issues:

I noticed some pronounced clunking when accelerating from a stop, and worse when accelerating from a stop and turning left or right at the same time. First thought was that it was a CV joint failure. I got under the car and found the front passenger side outer CV boot blown open and grease everywhere. I replaced that this weekend with a new complete axle assembly, but the clunking is still there. That axle was shot and the outer CV was shakier than a teenage boy at a school dance. No other CV boots show wear, but I could possibly still have another bad CV joint, there are three outer joints left to check on or replace!

Its very difficult to tell where this clunking is coming from while driving the car, it could be up front, or out back, I have no idea.... it seems to clunk the entire car. It happens under moderate to heavy acceleration. When starting from a stop and accelerating slowly you can avoid the clunk all together.

When shifting from drive into park, there seems to be a lot of "play". If I'm on a slight hill and don't pull the e-brake, the car will roll back or forward a few inches before coming to a full stop. Maybe this is where the clunking is coming from? What can I check here?

I have the Bentley manual on the way to my house, and today I'll probably get back under the car and see how much play the driveshaft has and check the other axles for play too. Possibly a differential problem too? The tires all show even wear across them, on all four corners. Theres no tire scrub or anything abonomal in that regard. The front tires are slighty more worn than the rear, but very even. Don't know if that info helps at all. I'm just a novice!

Any ideas you guys can come up with would be GREATLY appreciated!

stellick · 05-08-2012, 12:00 PM

It was raining cats and dogs last night so I couldnt look at anything. Any ideas to take back with me to the car folks?

4Driver4 · 05-08-2012, 12:33 PM

Something is loose or some bushing/mount is wasted.

stellick · 05-08-2012, 01:30 PM

Quote:

Originally Posted by 4Driver4

Something is loose or some bushing/mount is wasted.

Sweet! I'll just check every single bushing and mount and anything else that could be loose! Which was already the plan...

I was hoping my stupid long post would point out a possible known failure or issue...

eejimm · 05-08-2012, 03:02 PM

Given that it seems to be there under acceleration, I'd also look at the motor and transmission mounts. Also, if you can get the vehicle up on a lift, see if there's any movement or noise when you shake the wheels (bearings?) although the change in suspension geometry when on the lift can sometimes mask this...
Jim

SloopJohnB@mac.com · 05-08-2012, 05:04 PM

Wouldn't hurt to check the exhaust pipe/muffler mounts as well.

05-08-2012, 12:33 PM	#3
4Driver4 Tech Guru Garage is empty, add now Join Date: Oct 2002 Posts: 32,385	Something is loose or some bushing/mount is wasted. __________________ 4Driver4 Growing old is mandatory; growing up is optional. 2005 A6 Sedan Q 3.2 (wife's whip) 2000 A4 Avant Q 2.8 (daily driver) 1980 VW Scirocco (mid-life crisis car) 1983 Mazda RX-7 (revolutionary sports car) 2003 Mini Cooper S (just because) 1995 Mazda Miata, Superdupercharged(anti-Audi) 1999 Mazda Miata SSB (track beotch, no plate) 2003 GMC Yukon Denali XL (the anti-earth) 2004 Dodge Dakota (hey, at least it's stick and 4x4)

05-08-2012, 03:02 PM	#5
eejimm AudiWorld Member Garage is empty, add now Join Date: Jan 2012 Location: Denver, CO Posts: 107	Given that it seems to be there under acceleration, I'd also look at the motor and transmission mounts. Also, if you can get the vehicle up on a lift, see if there's any movement or noise when you shake the wheels (bearings?) although the change in suspension geometry when on the lift can sometimes mask this... Jim __________________ 2001 Audi A6 C5 2.7t 6 speed 1989 Maserati 2.2l 16V 5speed Getrag TC 1989 Maserati 2.2l Turbo II TC 1997 Infiniti J30 WG30DE quad overhead cam 1986 F250 1-ton IH 6.9l TurboDiesel 2007 Nissan Murano WQ35DE CVT ('Nothin normal here...)

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05-08-2012, 12:00 PM	#2
stellick Audiworld Junior Member Garage is empty, add now Join Date: Jan 2012 Posts: 13	It was raining cats and dogs last night so I couldnt look at anything. Any ideas to take back with me to the car folks?

05-08-2012, 05:04 PM	#6
SloopJohnB@mac.com AudiWorld Super User 2002 Audi S6 Join Date: Oct 2002 Posts: 4,150	Wouldn't hurt to check the exhaust pipe/muffler mounts as well.