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#1
10th January 2010, 08:58 PM
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My motor, seriously screwed....
Really, really weird last night.....
Coming home from a friends house, only about 4 miles away and the hazard warning lights come on, and the interior light. Also, the doors unlock. This is classic 'crash signal' behaviour and is what the car is designed to do in an accident to attract attention and easy access out of the car. but I was travelling in a straight line, not even 'hoofing it' as I had been for a few days. So I pulled over as I couldnt really drive with the hazards on. They wont turn off, so took the center console panel off (easy without tools on a facelift) and disconnected the hazard warning switch. Then the hazards went off as expected, and the engine died, which wasn't so good. Tried to restart, which it did, and then died, just like an immobiliser fault. Reconnected the hazard warning switch and the engine ran fine. Most odd. So, given it was only a few miles away and late (so quiet) decided to make it home with the hazards on.... Got home, turn off the engine, removed the hazard warning switch again (to stop the flashing!) and started unloading the boot etc. After a few minutes I could hear 'noises'. After a few more minutes I could still hear something weird, weird enough to make me open the botton, to which I find (bearing in mind ignition off!) the electric water pump randomly running and various solenoids clicking randomly..... What the chuff was going on here. Vagcom showed errors on the ABS Central convenience but the engine was fine, apparently..... So I gave up, disconnected the battery and went inside as it was dark and cold. This morning after some thinking, I concluded it could only be the engine ECU, which some will know is located in the 'water tightish' plastic plenum chamber at the top left back of the engine bay (viewed from drivers seat). In here is the gearbox ECU (when automatic), ABS/ESP ECU and Engine ECU. The whole box has a lipped lid with rubber seals and lots of writing to encourage dumb people not to let water get in it, for fairly obvious reasons. Anyway, opened her up and sure enough, some good signs of condensation in there. Took out the engine ECU and there was a few drops on the circuit board itself. The great news here, is that I dried it all out, put it all back togethert and shes purring great now but it was an interesting find. It was a combination of a few factors that ****ed it all up. I had a dodgy washer jet on the passenger side, where the pipe would come off and effectively squirt water over the plenum chamber. Now this alone, wouldnt normally cause an issue as its sealed tight enough, but unfortunately my car was LPG converted by a garage who chose to drill a neat, concealed, and yet fatal hole through the plenum chamber to get their wires into the chamber to connect where needed. It seems the recent 'thaw' caused the frozen condensation to become water again, thus causing my problems..... So, I guess the moral of the story is that the A8 is still a fantastic car, but unfortunately some people do modify them in a way that doesnt respect the design, and it causes problems later on.... All fixed now though, and loving it 
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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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#2
10th January 2010, 10:58 PM
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Quote:
Generally said: It's always good to be curious, take some tools in hands, unscrew your car - understand your car. Thanks for your success story. 
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 Audi S8 manual, 1996 <- much fun Kawasaki ZX9-R 2001 <- much more fun always remember:ficken!
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#3
11th January 2010, 07:03 PM
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MMMNNNN...now im curious...as i posted a while back im still having probs with my hazzards/siren going off..i replaced the batteries in the siren and yet the hazzards go off if you lock it as soon as getting out but doesnt if you leave it for a short time then lock it....not a good idea in this day and age to leave your car unlocked .
Now a while back i had a shark fin fitted/wired to the roof to replace the crappy electric go up.. get stuck half way down standard one and they removed the old one and placed a black bung that filled the whole brilliantly. After my problems with my alarm going off i had the bung silconed in to make sure no damp got in but i did have a vag thingy done and it came up as R/H/rear alarm sensor ..yet after resetting it and checking it worked it still goes off..  Now im thinking....i did buy a new sensor of A8 parts and should i replace it......or has damp got in to the boot and buggered up the alarm unit..... If you get out of the car and leave it for about 20 minutes and lock it it doesnt go off.....but if you get out lock it and walk away give it 10 minutes and the alarm goes off....i have disconnected the siren for my neighbours ............any ideas....
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#4
14th January 2010, 06:32 PM
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What a story Ian! Glad it had a happy ending and all well again
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Present: S4 B8 avant, fully loaded, MRC Stage2, Milltek non-res, KW springs Past: S8 D2 FL, S2 ABY coupe, RS6 C5 saloon, RS4 B7 saloon, S4 B5 saloon, S4 B6 avant, all gone but not forgotten
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