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#1
27th May 2015, 08:26 AM
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Dodgy earth connection or positive connection at the junction box, quite common problems on D2 and can give all kinds of odd issues. Do a search on forum you should find what to check and where.
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure 
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#3
27th May 2015, 12:38 PM
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Quote:
I had similar issues and it turned out to be fuel pump related and occurs when 1/3 - 1/4 full as the pump cannot draw the fuel out of the lower parts of the tank via the eductor pumps (which require the main pump to provide a good flow to "lift" the fuel out of the lowest parts of the tank using a venturi effect). The issue hasnt re-occured since the pump was removed, given a good optical bollocking, and re-seated. I thought at first that it was a battery/electrical problem due to the symptoms you describe AND the fact that I had left the car for a month and battery was v weak. Has the car been sitting for a while?
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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 May 2015, 08:45 PM
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The saga continues, and I am now leaning towards a fueling issue.
This evening I tried to start the car several times on the driveway, but seconds after starting, it would die. This happened three times before the car would simply not start at all. I can hear the fuel pump prime however, so it doesn't seem to have failed completely. Interestingly, I now get the all-red highlighted PRNDS as soon as I switch the key to the first position, which I believe is indicative of limp mode? I'm assuming this will have thrown a code?
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#7
31st May 2015, 10:23 PM
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When the pumps 'fail' as they do, they still prime, but don't deliver the required pressure, so the engine is starved.
It wouldn't account for any of the electrical gremlins you are seeing, and the chances of pump and electrical issue at the same time is virtually nil. I'd definitely be checking the connecting blocks for bad earth / positive connections as previously suggested. Even if they look good, take them off, clean them up and reseat. Failing that, I'd probably be looking for any signs of water ingress in the plastic plenum chamber under the bonnet at the back passenger side of the engine bay. It houses the gearbox and engine ECU, along with ESP/TC/ABS. Moisture in there can cause all sorts of 'fun'
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For parts enquiries and Forum User Administration please contact customer services directly, not me  - enquiry@a8parts.co.uk, www.a8parts.co.uk, or call 01642 783537The Daily Town Car - 2023 Tesla Model Y Performance. Black with Black. Giant ipad screen, huge sunroof, 4 wheel drive, Tow bar, lots of ooomph and made in China, so actually built properly unlike the Californian ones. The Family Wagon - 2018 Tesla Model X. Black, 7 Seats, Towbar, Homelink, Enhanced Auto pilot with Summon and self park, Heated front seats, CCS Charger upgrade, MCU2 Upgrade, Falconwing Doors, Self opening / closing doors, Netflix, Spotify, toys, Air suspension, alcantara roof + lots of other stuff...... The 17 year old Driver Wagon 2015 Skoda Citigo Monte Carlo. Alloys, Power steering, Aircon, Leccy windows, Sat Nav, bluetooth, central locking, cup holders, 59 whole bhp. Million times better than my first car. Well jealous..... The First 20 Audis: 2001 D2 4.2 QS Silver, 1997 D2 S8 Silver, 1999 D2 4.2 Silver, 2002 D2 S8 Dolphin Grey, 2003 C5 RS6 Blue, 1998 D2 S8 Black, 2000 D2 4.2 QS/S8 Ming Blue, 2003 D3 4.2 Ming Blue, 2005 B7 S4 Blue, 2006 D3 3.0 Tdi Black, 1999 D2 4.2 Silver, 2003 D3 4.2 LPG Crystal Blue, 2000 D2 S8 Silver, 2007 3.0 Tdi Q7 Black, 2009 B8 S4 Black, 1998 D2 S8 Agate Grey, 2006 D3 4.2 Tdi Blue, 2006 D3 S8, 2007 Q7 3.0 Tdi, 2006 C6 S6, The Second 20 Audis: 2011 A7 Sline, 2001 A2 1.4 Tdi Black, 2002 A2 1.4 Tdi Silver, 2006 A8 4.2 Tdi Blue, 2007 4.2 Tdi Q7, 2006 S4 Cab Silver, 2010 RS6 Saloon Black  , 2007 TT Roadster, 2010 A8 D4 4.2 Silver, 2006 C6 A6 2.7 Tdi Quattro, 2000 D2 4.2 QS/S8 Ming Blue (again), 2008 Q7 4.2 Black, 2009 C6 RS6 Saloon Daytona Grey, 2001 Fully Loaded A2 Tdi, 2006 Avant S6 Black, 2007 VW Caravelle Exec Black (almost an Audi) 2009 TT Roadster Daytona, 2015 Q7 4.2 tdi lava grey, 2002 GmbH D2 demonstrator, 2006 D3 A8 LWB 4.2 Tdi Black Most Recent Audis: 2001 A2 1.4 Tdi Black, 2007 4.2 FSi Q7 ABT Blue, 2016 S5 Coupe Launch model, 2004 S4 B6 Cabriolet, 2016 Q7 Sline White, 2006 Q7 4.2 FSi Black, 2012 Q7 Sline+ 4.2Tdi White, 2008 Blue Audi S8 Everything Else 1989 Subaru Justy, 1986 Vauxhall Cartlton 2.0 GL, 1985 Vauxhall Carlton 2.2 CDi, 1987 Ford Sierra XR4x4, 1983 Vauxhall Senator, 1985 Vauxhall Senator 3.0i, 1997 Polo Saloon, 1997 Peugeot 306 1.9 TDi, Ford Sierra Sapphire 2000E, 1990 Subaru Justy, 2000 Subaru Impreza, 2000 Subaru Impreza RB5, 1993 Range Rover LSE, 2005 VW Bora, 2003 Skoda Superb, 2003 VW Passat V6 4 Motion, 1996 Peugeot 106, 2000 Range Rover 4.0, 2019 Tesla Model 3 Performance
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#8
7th July 2015, 06:53 PM
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I think I might be close.
The car altogether will not start now, so I ran diagnostics. Got loads of short to ground codes for the injectors which from my research points to the fuel pump relay. Sure enough, when I took the casing off the relay and watched, it's not clicking shut, so the fuel pump is not coming on at all. Now if I push the connection shut, the fuel pump hums away happily, though the car will still not start - is this to be expected or is there something else going on? Relay is on its way either way.
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#9
8th July 2015, 06:08 AM
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Quote:
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Mark ------------------------------------------------------ 2002 FE S8 Ebony Black Pearl ------------------------------------------------------  ------------------------------------------------------ Cars Owned: The Tesla Era: 2020 Model S Performance Ludicrous+ (present) (Black, with all black premium interior and carbon fibre décor, 21" sonic carbon twin turbine wheels and FSD capability) The Audi Era: '97 A8 4.2 (Ming Blue) --> '96 A8 4.2 QS (Dark Green) --> '02 FE S8 (present) The Citroen Era: '84 BX 1.6 RS --> '89 BX 1.9 DTR Turbo --> '94 XM 2.0L Turbo --> '96 XM 2.0L Turbo Exclusive --> '00 Xantia Activa 2.0L Turbo The Banger Era: '76 1.2L Lada VAZ-2101 (Ruski Fiat 124) --> '80 1.7L Morris Ital HL, finished in Ermine White and Rust
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