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D2 - Transmission Gearboxes, diffs, drive shafts. |
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#1
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Hi Moltuae
Thanks for your response. You may have something here because when I try to do a flying start from standstill, I tend to hold the car with my left foot on the break and right foot hovering over the throttle. Maybe I am hitting the throttle before releasing the break and thus maybe causing the issue you have listed above. I'll stop with the left foot breaking and see how it goes. Thanks for your help everyone, much appreciated. |
#2
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There's one or two threads about the brake switch here somewhere. From memory, I believe there are two sets of contacts, one which is supposed to make/release before the other. If the timing of those contact openings/closures is not correct, it seems the ECU (the ESP ECU I assume?) limits the throttle.
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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 Last edited by moltuae; 13th October 2018 at 10:59 AM. |
#3
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Thanks for the info Mark.
I'll alter my driving style at the traffic lights for a while, see how that goes but ultimately will probably just buy a new switch and swap it. Already spent a fortune on the car so no point in getting cheap now. Cheers Frank |
#4
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![]() Quote:
EDIT: Just found the thread Mark was referring to. It's a pretty long one, but start from here: http://forum.a8parts.co.uk/showpost....&postcount=285 and also check post #288.
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts Sold! ![]() My DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds Last edited by steamship; 13th October 2018 at 02:26 PM. Reason: Added link to relevant thread |
#5
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It's been said above, but my very first thought was adjust the brake pedal switch.
![]() You can monitor it with VCDS and see just how "hair trigger" the 2 separate sensors are. I adjusted mine, but it still occasionally does the same thing. Next time I have all the gubbins out of there I'll give it another turn or two. Sadly that will probably be fairly soon as I have an issue with my DVB-T wiring which is all buried in the same area, behind the drivers knee panel. ![]() Basically there are two switches in one with very slight difference in the operating position. One works the brakes lights, the other informs the ECUs. It is very possible to have the pedal released, brake light off, no braking force BUT the ECUs are still being told the brakes are on, with strange sluggish behaviour the result until some minor jolt or vibration regularises everything. It is of course not a fault, just normal operation, so nothing gets recorded.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant. 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". ![]() ![]() Finally: gone, but not forgotten..... 1998 D2 PF S8. Agate Grey/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. ![]() 1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, 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! |
#6
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Thanks for the response everyone.
I think we can bring this post to a close at this point. I have altered my driving technique this last month or so and have had no further occurrences. I did purposely hit the throttle on one occasion slightly before releasing the brake and the slow acceleration was replicated. Perhaps the brake switch may be a little sensitive and need adjusting but at the moment I'll just carry on as I am and monitor the situation. Thanks for all your support.
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Audi S8 D2 2002 88k mls Ebony pearl effect black. Grey interior. |
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