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#11
11th February 2013, 06:54 PM
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it works fine in reverse and 2nd and if i put it into triptronic i can put it into 1st and is fine i can nail it and doesnt slip in them gears soon as i put it it drive or 3 or 4 it just revs up but can smell a dodgy smell so could it be electrical?
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#12
11th February 2013, 07:03 PM
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The dodgy smell is most likely the transmission fluid overheating and burning. Not good for the fluid at all, and it will now for certain need changing.
I had a slipping brake band in an old Mondeo Automatic, got it fixed at a transmission specialist for £300 including new fluid. The symptoms I had though was total loss of second gear and a slipping overdrive. Driving everywhere with just 1st and 3rd was not fun as it would rev to the red line before changing straight from first to third.
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Manny 2004 A4 1.8T Sport Cabriolet, 89K Miles Past 2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly with retrofit AMI and DVB-T in place of Analogue 2003 Volvo S60 D5 SE Manual, 197K miles. 2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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#14
11th February 2013, 08:08 PM
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Slipping gearbox
From what you are describing this really does sound like an internal issue since 3rd and 4th gear aren't transmitting drive...I would hope the f125 switch is buggered....cos usually low fluid causes thumping and dodgy gear changes....but i hope for your sake it is just fluid that you need....
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01 Audi a8 fl sport - Grey, Bose, Glass Sunroof, S8 grill/mirror covers/wheels, Aftermarket Exhaust, very quick and lots of fun!!!!!....well I gave it one final push on the pedal to hear that v8 growl and then it was off to a new home..... 99 Audi a8 fl - Silver, Black alcantara seat/ S8 grill/side mirror, MFSW, Solar Sunroof, 17" Monoblocks (for that extra cushion of air), Rnsc, Bose.....great motorway cruiser....now gone to a new home 02 Final Edition S8 - Avus Silver, Extended Leather Pack III, Front & Rear Heated Seats, Servo, Blinds, Rear Seat Entairtainment with Playstation, Bose, Bi Xenons.....now gone to a new home 97 PF A8 4.2 quattro sport - Cashmere Grey, Servo, RNS E, Blinds, Bose, 20 Final Edition Alloys, LPG....sold sadly and will be missed 03 S4 V8 Saloon - Misano red, Manual, Milltek, Bose, Xenons, RNS E - Sold as of Feb 2012
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#15
11th February 2013, 09:35 PM
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ive been speaking to a few people and a bloke who has a few a8s that maybe is on here said he had similar problem because the ecu was wet and shorting under the bonnet, the car was steam cleaned and wash out all under the bonnet so i think this may be it also under the passenger seat is wet were they did carpets it not coolant as hasn't used any so fingers crossed its ecu problem or oil as love the car
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#17
11th February 2013, 09:40 PM
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Gearbox ECU is I think the top one in the box by the bulkhead on the nearside under the bonnet.
Getting the cover off to check inside is fairly easy (just a few screws) though sometimes the sockets they fix into just rotate in the plastic they're set in so you need to be careful.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.). 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one!  Finally: gone, but not forgotten..... 1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! 
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#19
11th February 2013, 10:54 PM
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the gearbox is gone - the symptoms, the smell, it all point to a failed gearbox. Since when do wet electrics (a) smell or (b) work at all?
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2019 BMW M5 (my daily driver) 2002 Mark's D2 S8 FE 2020 BMW M340d xDrive (Anely's daily driver) 2000 FL D2 4.2 QS - SOLD 2011 
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#20
12th February 2013, 07:39 AM
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Water in the cabin is a common A8 fault to do with evaporator drains. Nothing to do with the gearbox.
Its a hugely slim chance that water has ingressed into the plenum chamber, and affected the ECU, thus affecting only gears 3/4/5 Its fractionally more plausible that some transmission fluid has leaked out, burning on the exhaust and causing low fluid, but to be honest low fluid would affect gears 1/2 just as much as the others. Given the age, mileage and symptoms, number one in my book is still a terminal mechanical failure inside the box, sorry. Take it to an automatic transmission specialists - Not a generic garage - They will see ZF boxes all the time and should be able to give you a good idea, fairly cheaply of whats going on....
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