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| D3 - Fuel and Exhausts Everything to do with getting fuel into the engine, and fumes back out again |
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#1
22nd August 2013, 12:06 PM
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Tinny rattle coming from exhaust area
For the past few weeks on cold starts in the mornings I've been hearing a metallic rattle coming from the back of the car. It only seems to happen on cold starts and if I pull away slowly. Once the engine and exhaust is warmed up, I don't seem to hear it. It doesn't get faster or louder as the car accelerates, so it's nothing rotational, just maybe something loose and vibrating.
I assume it's the exhaust because I put the suspension in 'lift' mode, started the car then shot round to the back and stuck my head underneath to try and hear where the rattle is coming from but didn't have much luck!  It sounds like it might be coming from just before the rear silencers but I can't be sure.Anybody have any ideas? 
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Currently '8-less Previously: - Aqua Blue Pearl D3 S8 - Kamut Beige leather, ACC, B&O, factory RSE, solar sunroof, electric blinds, ski bag, Homelink, comfort headrests. - Aqua Blue D2 S8 - Grey leather/Alcantara - D3 A8 3.0 CVT - D3 3.7 V8 
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#2
22nd August 2013, 12:36 PM
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could possibly be the silencer starting to fail and break up internally?
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 Audi S8 2002, Black (even the chrome bits) Audi RS6 Avant 2008, Daytona Grey Maserati Granturismo 2008, Metallic Nero Carbonio Audi S8 2015, Daytona Grey
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#3
22nd August 2013, 12:43 PM
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If that's the case then it's a good excuse to take them out
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Currently '8-less Previously: - Aqua Blue Pearl D3 S8 - Kamut Beige leather, ACC, B&O, factory RSE, solar sunroof, electric blinds, ski bag, Homelink, comfort headrests. - Aqua Blue D2 S8 - Grey leather/Alcantara - D3 A8 3.0 CVT - D3 3.7 V8
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#4
22nd August 2013, 02:10 PM
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check all your pulleys for movement sometimes they can do that for a short period if they have any play also have you checked all brackets for clearance and brake disc backing plates etc? might be something thats loose until things warm up
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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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#5
22nd August 2013, 10:33 PM
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I had one of the tinfoil style ally exhaust heat-shields partially break loose on another Audi I had and this give the exact same symptoms... tinny rattling at tick over rpm and then vanished at anything over 1200rpm... I think the local independent I used at the time said it was unrepairable as it had sheared the securing screw off in the bodywork due to corrosion, so they added a ty-wrap or self tapper and it didn't rattle again..... could be something along those lines anyway.
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#6
25th September 2013, 12:52 PM
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Problem solved
After having straight pipes fitted yesterday, the whole exhaust system obviously has to be dropped down to be worked on. When it all put back in place everything must have been tightened up. If the rattle was coming from the broken up silencers, they are now completely gone, and I got under the car and checked the thin pressed metal heat shields that surrounds the exhaust at the back, and there is absolutely no play anywhere in it.
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Currently '8-less Previously: - Aqua Blue Pearl D3 S8 - Kamut Beige leather, ACC, B&O, factory RSE, solar sunroof, electric blinds, ski bag, Homelink, comfort headrests. - Aqua Blue D2 S8 - Grey leather/Alcantara - D3 A8 3.0 CVT - D3 3.7 V8
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