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#1
29th February 2012, 03:08 AM
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Hi Singh!
Thank you so much!
Yes, mine is a faithfull 4 speed box, I've been keeping it for 10 years! No big issues so far, drive just right. But from some 4 years back, running idle it sounds like a diesel engine, no more that nice V8 muted purr. Asked some 4 different technicians to check it, they spent several hours checking every pulley etc and found nothing! Maybe some valve clattering, I don't know. Otherwise the car run just great. It sounds OK at any rpm above idle. Have you ever heard something like this before? Many thanks! BTW, nice MJ pic, one of my fav artists! Cheers, Doug Last edited by Doug773; 29th February 2012 at 03:11 AM. 
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#2
29th February 2012, 04:56 AM
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Welcome from me too
 Your gearbox code should be on your build sticker both on the car (in the spare wheel well) and on the front inside cover of your original service booklet if you have it. The gearbox code position is shown on this thread HERE 
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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
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#3
29th February 2012, 05:51 AM
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>> running idle it sounds like a diesel engine
Camshaft chain tension is maintained by oil pressure in our engines AFAIK. If oil pressure is not that strong enough at idling, then chain starts to rattle. When RPM goes above idle, the oil pressure becomes strong enough to tension chain properly. Change oil pump and problem should disappear.
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I'd rather drive on left
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#4
29th February 2012, 06:09 AM
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Quote:
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Men have feelings too. For example we feel hungry.....
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#5
29th February 2012, 06:20 AM
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Each bank of cylinders is driven by 2 camshafts (V8 has 4 camshafts) , the first camshaft is driven by the cambelt whereas the second camshaft is driven by a chain that connects both camshafts together inside the head.
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Manny 2004 A4 1.8T Sport Cabriolet, 89K Miles Past 2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly with retrofit AMI and DVB-T in place of Analogue 2003 Volvo S60 D5 SE Manual, 197K miles. 2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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#6
29th February 2012, 07:08 AM
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I'm guessing it's CML, it's also on the box it's self but you'll have to get it on a ramp or similar to see.
I had my box done recently, fluid and filter. No issues...... Yet!
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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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#7
29th February 2012, 07:14 AM
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Right. These two chains are located on the back side of the engine. So if engine sounds diesel when idling the first thing is to chech the sound of back top side of cylinder head, not the front side where all pulles and belts are.
If these are chains, than it's almost 100% low oil pressure at idling. Warning lamp still doesn't come on, but it is enough to hear the rattling sound. Can be further diagnosed by measuring oil pressure at idling by connecting manometer. Subframe out, engine sump out, and check if oil pump is clogged with debris. If not, then change oil pump (plug and play operation).
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I'd rather drive on left
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#8
29th February 2012, 01:35 PM
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Quote:
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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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