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#1
31st March 2015, 07:04 AM
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Battery failure? help!
On returning from being away for a month (and , mistakenly, not getting The Laird to start my car very week or so) the car started ok yesterday but then started to run rough with all sorts of warning lights coming up - ABS, battery, lights, etc. it then dropped in revs to 4-500rpm and then died. I put the battery on charge overnight ( ctec mx5). But this morning when I went to start it started ok but after a few minutes as I took it outside for a drive to get the rust off the brake, the revs dropped and it died again. Went to get vcds. But realised I gave it to the Laird whilst I was away. Is this just a battery thing?
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind. 
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#2
31st March 2015, 07:41 AM
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Update. Went out to check on the car and it started ok with plenty of oomph in the battery so I got it back up the drive. It then started misfiring and died. The Laird was at a home so brought around vcds and a scan showed multiple low voltage issues and misfiring. However, it starts ok with seemingly sufficient power in the battery but then runs rough before dying. I guess I need to get the battery condition checked. Can this be checked with vcds?
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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#3
31st March 2015, 07:50 AM
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Seems odd David, i was getting similar when my the fuel pump died. But seeing it's been sat a while i wouldn't rule the battery out yet. But as you've given it a charge it's either not taking a charge or your alternator is'nt pushing out juice. VCDS back off Jim i think, and maybe the battery out his boot to try? Rule out the battery it's self
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1996 A8 4.2 QS. Bose, Solar roof, um...um... rally sport towbar. Now gone to a new home as the Traders 8. Bright yellow bus o love.
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#4
31st March 2015, 07:57 AM
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Quote:
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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#5
31st March 2015, 08:20 AM
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how much fuel is in the car David? it does sound like a fuel pump or transfer issue - can you get some more fuel in there if it is lowish on fuel to eliminate that one?
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Confidence is the feeling you have before you know better . . . .  Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble  Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs
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#6
31st March 2015, 08:30 AM
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its at about 1/4 tank. Thats not been a problem before and it would be strange if it just happened after being not used for 1 month. Going to get the battery checked first and then work from there.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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#7
31st March 2015, 08:33 AM
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Are you waiting 6 seconds after switching the ignition on before cranking? It could be the throttle body needs to do a self check after its lost power. You can force it with VCDS but it automatically does it if you do as above before starting.
Mine only just fired on the last occasion of using the old battery and I got ABS and TC warning lights on together as there wasn't sufficient power for the ABS controller to self check. If you do need a new battery there was much discussion about options recently when I needed mine. Halfords for a Yuasa 5 yr warranty effort, with a trade card discount, is what I went for in the end.
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD=== 2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus 2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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#8
31st March 2015, 08:35 AM
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Quote:
 I will try waiting 6 secs and see if that does it.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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#9
31st March 2015, 08:51 AM
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Well, tried that pausing to allow the throttle body to self check. The engine is turning over strongly and catches ok but then runs v rough, misfiring badly - sounds like its running on 3 out of 8 - before dying.
 I am beginning to think that the battery is ok and is now holding sufficient charge but that the voltage drop has affected something else. Will look at fuel issues as suggested by Neil/Dezzy. Its not helped by the fact that its freezing rain outside ..... 3 days ago I was in temperatures of c30degC and clear blue skies and now Iam freezing my n+ts off.
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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#10
31st March 2015, 08:56 AM
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Last time mine behaved anything like that it was "just" a faulty temperature sensor.
But as others have suggested, it could be fuel pickup so get some more in. Somehow. Multiple trips with can/cans to the garage?
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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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