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Hi all I just picked myself up a cracking 97 S8 I love the car but she dose have a few issues and I am just wondering if anyone else has been in the same boat and can shed any light as to what it might be. So from cold she fires up perfect and runs perfect until I shut the car off then when I start the car back up when its hot the CAT light comes on and has a missfire and will not go off again. Thoughts are as follows... OBD scan - Got a cheap scanner and came up with missfire cylinder 2 which led me to think coils - So I swapped the 1st and 2nd coils over but the missfire didn't jump (Still might be coils though and I am looking into buying new ones) Ignition amplifier unit - Read online they can go bad randomly I bought a new one as it was cheap enough and already fitted but no differance. Spark plugs - Took them out car has a full set of iridium plugs fitted but they all seem pretty fresh and good (might get another set also to rule this out) My main thought is this when I took the engine covers off to check the coil's etc I found these two plugs on the top on the engine for the knock sensors they are totally borked and fell to bits in my hand Ive ordered two new knock sensors but I also don't know if that would be cause the missfire but they are getting replaced reguardless. Weird thing is I can leave leave the car to cool off or overnight and she will fire right up again no problems plus the car will run perfect so long as I dont shut it off after a run while its hot. Its really got me scratching my head??? But thank you for any input it would be greatly appreciated Cheers Johnny.

Hi I'm a new member and a owner of a Audi S8 D3. I'm a die hard Audi fan and have been for years or even decades. I needed some advise and thought this would be the ultimate place to share my problems with. Lol🤗 So where do I start. I purchased this car a while ago as a project and have now started to look into it. It's been stood since 2007 and has covered around 5thousand miles. 5k. The previous owner had it parked for 10years as it had an electrical fault and some damage which was caused in 2007. After reading on various websites, Ive concluded the steering column to be faulty as vcds is showing steering lock actuator n360 open circuit fault leading me to believe it needs a column. The car accepts the key but there is no ignition lights on the dash. Hopefully when I've sorted this problem I will have to start it at some point. What would be the best procedure. I have already dismantled the front end hoping to crank it by hand for the first few revolutions what should i do as I don't know the state of the engine. If it's seized etc. I don't want to damage what could potentially be my car i keep for life. Any help would be appreciated. Thanks