Hi all, Just after some advice about the S3 engines. I was bored the other day so decided to check the plugs and poke about a bit and I noticed they were covered in 'soot', propper caked in it if im honest but the majority of it wiped straight off. Also noticed that the exhaust pipes were covered and washed a load of it out the exhaust. Left it for a couple of days and looked again and they were black again, doesn't this mean its over fuelling? I have spoken to Superchips who have said they haven't had any problems with there maps causing this but did agree it sounds like its over fuelling, and it is now in at Audi who have checked and reported back that its not over fuelling ( surprise ) but when I asked if they had checked the plugs and they replied 'yes' I then asked can you explain why they are black they replied "good question, we'll get back to you on that tomorrow"!!! I don't have access to Vagcom etc so just after some general opinions or if this is normal?