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| D2 - Transmission Gearboxes, diffs, drive shafts. |
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#1
17th June 2016, 11:27 AM
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My old S8 used to do it until I changed the fluid and filter.
I suspect its the valve bodies not closing or connecting properly causing it to not choose the correct gear. Do a filter change, check the levels and see how u get on. 
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#2
17th June 2016, 11:49 AM
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Engine sounds fine, and the gearbox otherwise shifts ok ?
So, how about torque convertor ? It will try and lock up around 50mph when in drive. In tiptronic, it locks up much sooner. Does the problem happen in tiptronic, and drive ?
__________________
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#3
17th June 2016, 08:07 PM
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The engine is glorious
 It shifts perfectly in all gears too, both in and out of 3rd. Its already in gear when it does the shudder, rather than shuddering as it goes in.I *think* happens in both tip and drive in the same conditions but actually on the last test drive I was avoiding tip since it keeps throwing the 11119 gear signal code in the ABS. I couldn't quite follow what VCDS was telling me about the TC - it was open, closed, and re-something, none of which seemed to correspond with what I thought it should be doing. I'll try it again and report back. DaveMcB - it has just had new fluid and filter  David'S8 - thanks for the compliment! If it was a 4 or 6 I'd be all over it, but this is the first time I've properly worked on an 8 or a 5HP24 so I'll take all the help I can get -fuel filter soon
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#4
6th July 2016, 08:22 PM
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Sooo... took it out for a hundred miles or so today. The shudder happens in 1, 2 and 3 in the right circumstances - low rpm, light throttle, mostly up hill but not always and also happens in D, S and Tip. At one point pulling away from a stop up a hill it did it in 1, 2 and 3 in succession until I got annoyed and booted it. Lots of throttle and it doesn't do it at all - Tip or S on the twisty bits and it is perfectly fine (and wow does it move!!!). The shudder really spoils the experience though.
I am a bit surprised how low geared it is though. I knew the S8 had different ratios to the others, but 3K at 80 seems a bit excessive for a V8. That's about the same as the TT 225 whereas my 3.7 was geared the same as a diesel. The gearing is quite an incentive for a manual conversion whether the auto goes bang or not...
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#5
13th July 2016, 10:54 AM
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Having thought about this a bit more I've realised that the problems really started when it was low on fluid before I took it out. The gearbox sump had been fitted with bathroom sealant so it was ****ing oil everywhere. I only checked it when I pulled the drivetrain, but it was whining quite badly just before that. The oil level was down to the join between the sump and the casing so I'd guess about 3 litres short.
I'm wondering if this did some permanent harm to the TC before I even took it to bits, and so whatever I've done afterwards has actually had no effect on the underlying problem. Given our sponsor's online sale, is it worth sticking in a used TC before I tear it all apart again? At least I can drive it while I collect manual conversion parts then...
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#6
13th July 2016, 05:26 PM
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Well I bought another TC in the sale. Barring any bright ideas to do with the valve body I'll make a start pulling it out next week.
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#7
23rd July 2016, 09:07 PM
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The replacement TC fixed it
 Did a couple of hundred miles this evening and the car is transformed! No more hunting or shuddering, nice crisp changes, and the DSP very quickly adapted to the Devon roads. She is a joy to drive now
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