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D2 - Fuel and Exhausts Everything to do with getting fuel into the engine, and fumes back out again |
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#1
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My s8 de-catted itself !!!
I came to sell the old O/S cat for scrap along with some others i have to cash in, on trimming the pipes either side of the core, discovered there was no monolith inside !!! It has blown it away lol. I did drive it for quite a few months with that tell tell rattle but then it stopped. Only at the MOT did the problem raise itself as it failed on CO along with a catalyst code on VCDS...
Quite extreme and clean as a whistle on the inside !! |
#2
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Amazingly smooth round self-decat
My S8 has some sort of rattle too I wonder if its the cats, I hope its not the release bearing or something transmission related. |
#3
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I used to only notice it at lower speeds and on over run if popping the throttle - its quite subtle yet tinny metalic exhaust sound. You can get a mechanics stethoscope to help pin point it but id say the two sounds are quite different
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#4
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Lol - reminds me of the cat on my BX16v which spat itself out over time! At night you could see bits of it glowing still when it hit the road surface behind me....
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD=== 2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus 2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC |
#5
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My S8 did the same thing whilst I was on my way to get some sports cats fitted. I was driving carefully up the M1. Going through a set of roadworks I had a Merc E-class coming flying behind and sit 10ft off my rear bumper. At the NSL sign I put my foot down, the car kicked down into 3rd and gained speed at a glacial pace, as the monolith was blocking the exhaust and causing huge back pressure. Then with an almighty clunk and rattle it spat the contents of one of the cats out the exhaust, showering the Merc with smoke and metallic particles, so thick you couldn't actually see his car through it. At which point the S8 shot off like a rat with a firework up its arse...
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#6
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Quote:
Bah! Typical Merc drivers
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A journey of a thousand+ (epic) miles, begins with a single step, (to the door of an 8). Lau Tzu |
#7
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Beauty of V8- if one side gets blocked you can still drive. Once I had catalyst brake down on Mondeo. Large chuck broke of it at the front of catalyst and turned sideways blocking exhaust flow. Car could not get above 25mph.
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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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