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D2 - Everything else Anything that doesnt fit elsewhere |
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#1
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S8 D2 Lazy starter on hot start
Hi. I have been tootling about this weekend and had an issue Saturday where the car was slow in turning over when at normal operating temperature. Cold start was perfect but throughout the day just got gradually worse, when on the last very reluctant hot start I just took it home and dumped it on the drive.
Found this answer within a D3 thread and wondering if this could be the case? http://forum.a8parts.co.uk/showpost....72&postcount=7 This morning car spun over with no issues when cold but once again sluggish on hot start (made sure I was back on the drive before attempting) I have VCDS lite but there doesn't seem to be any error codes logged, no eml on either. Any advice on next step?
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Paul Gosport UK ________________________ Audi S8 2002 FE Avus Silver / Extended Red Leather. Daily Driver: BMW 3 series GT - Just more practical for my camping trips! |
#2
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Hmm, maybe not? It depends what you mean by "slow".
If by slow you mean the starter sounds less lively and the engine cranking more slowly then it's likely something else. If by slow you mean it cranks as normal but takes longer to fire up then maybe. I've had a few cars with CPS failure over the years and they tend to be pretty blatant and terminal unless the sensor is just a bit loose. In my experience the car more likely just stops running, sometimes with a few misfires on the way down, rather than failing to start.
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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". (Even rarer than a D2 S8!) 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. 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. (internal dimming mirror added later) 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! |
#3
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Yes HP, very slow cranking to the point it feels like the battery has drained then the car catches. Runs perfectly normal afterwards.
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Paul Gosport UK ________________________ Audi S8 2002 FE Avus Silver / Extended Red Leather. Daily Driver: BMW 3 series GT - Just more practical for my camping trips! |
#4
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Damn. I'm really sorry you're having problems with it
I'd probably change the starter first tbh. The junction box is new, and all the terminals are nice and clean so its unlikely to be a power problem. We'll need to sort a time for you to bring it back once Andrew's is done. |
#5
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Quote:
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Paul Gosport UK ________________________ Audi S8 2002 FE Avus Silver / Extended Red Leather. Daily Driver: BMW 3 series GT - Just more practical for my camping trips! |
#6
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Can you advise part number of replacement please?
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Paul Gosport UK ________________________ Audi S8 2002 FE Avus Silver / Extended Red Leather. Daily Driver: BMW 3 series GT - Just more practical for my camping trips! |
#7
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Last edited by MikkiJayne; 15th May 2022 at 04:53 PM. |
#8
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We sorted this out this morning - turns out it was the earth strap, although a slightly unusual presentation of the problem.
Obviously I cleaned all that stuff up when the engine was out, but measuring the voltage while running showed 14.2 at the junction box but only 13.3 at the battery. This left the battery only 40% charged (and unfortunately 40% health) hence the lazy starting. When I investigated further, I discovered a layer of grey aluminium oxide dust between the earth strap and the mounting block on the body. I think the reason it got worse to start when hot was that all this area gets hot as well and so everything expanded a bit, including the aluminium oxide dust, thus reducing the available voltage even more. Cleaning up the terminals with some scotchbrite got rid of the dust, and with a replacement battery fitted it jumps to life as it should I gave everything a coat of waxoyl to hopefully prevent corrosion getting back in again. |
#9
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The Liberian is doing his happy dance!
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Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light. |
#10
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Yep. We put money on a certain Mr smug popping up
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Paul Gosport UK ________________________ Audi S8 2002 FE Avus Silver / Extended Red Leather. Daily Driver: BMW 3 series GT - Just more practical for my camping trips! |
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