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#1
17th November 2012, 10:32 AM
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sounds like a faulty idle control valve as per the scan Dezzy
The Idle control Valve (basically) controls the amount of air let into the inlet manifold when on idle. The valve has a 'Pin' which moves in and out incredibly fast, meaning the engine idle can be controlled accurately. Common symptoms of a faulty Idle Air control Valve (IAC) are: Poor idling (you would never have guesed!) Cutting out when the engine speed drops (approaching bends, roundabouts etc) High revving on idle Idle speed going up and down A diagnostic machine will sometimes point out the IAC is faulty, however, not always. Sounds like it might be sticking even after youve cleaned it
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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 Last edited by Architex_mA8tey; 17th November 2012 at 10:34 AM. 
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#2
18th November 2012, 09:09 AM
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Thanks Neil
She's let me down again, won't restart and has been abandoned out on a little village in the sticks. Same again missing popping and then won't run. Seemingly when up to temp no issues when it was cold or warming and again no faults recorded. Could the idle valve cause this when not at idle? Just would not run on any throttle position. How long after an AA call out should you leave it before having a car fire?
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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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#3
18th November 2012, 10:18 AM
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Idle control valve would only affect idle/low throttle. Possibly crank position/speed sensor.
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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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#4
19th November 2012, 06:45 AM
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Thanks Ainars.
She totally refused to fire up yesterday, but i couldn't start top strip it down where it's dumped. I wondering if it's fuel related, pump maybe
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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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#6
20th November 2012, 11:01 AM
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Would the position sensor/speed sensor throw a code? I'm happier in a way that she won't run now as it should be easier to find the fault (fingers crossed) that said i'm still open to hear other reasons to non starting.
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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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) direct to the pump to see if you can hear it running.
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