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#1
5th June 2012, 12:31 PM
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Black sooty valve...what causes this??
Well I removed the intake manifold today as I am investigating a problem on cylinder 7.
I noticed that one of the valves was black and sooty...where as all the other valve were nice and shiny...wat would cause this...and is this what they refer to as a burnt out valve???????
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01 Audi a8 fl sport - Grey, Bose, Glass Sunroof, S8 grill/mirror covers/wheels, Aftermarket Exhaust, very quick and lots of fun!!!!!....well I gave it one final push on the pedal to hear that v8 growl and then it was off to a new home..... 99 Audi a8 fl - Silver, Black alcantara seat/ S8 grill/side mirror, MFSW, Solar Sunroof, 17" Monoblocks (for that extra cushion of air), Rnsc, Bose.....great motorway cruiser....now gone to a new home 02 Final Edition S8 - Avus Silver, Extended Leather Pack III, Front & Rear Heated Seats, Servo, Blinds, Rear Seat Entairtainment with Playstation, Bose, Bi Xenons.....now gone to a new home 97 PF A8 4.2 quattro sport - Cashmere Grey, Servo, RNS E, Blinds, Bose, 20 Final Edition Alloys, LPG....sold sadly and will be missed 03 S4 V8 Saloon - Misano red, Manual, Milltek, Bose, Xenons, RNS E - Sold as of Feb 2012 
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#3
5th June 2012, 06:21 PM
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That's intake valve and they are normally nice and shiny even if you have valve stem seals leaking oil petrol washes it off. Could be leaking valve letting combustion gasses in the intake and overheating valve in the process
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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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#4
6th June 2012, 08:31 PM
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burnt valve
A burnt valve sounds about right. Once I get the head off I will know for sure. Need to get a extra long socket set to get to the head bolts....which I will do over the next few days...and then I will take it off....
Will be good to find out what eventually went wrong with this car...
__________________
01 Audi a8 fl sport - Grey, Bose, Glass Sunroof, S8 grill/mirror covers/wheels, Aftermarket Exhaust, very quick and lots of fun!!!!!....well I gave it one final push on the pedal to hear that v8 growl and then it was off to a new home..... 99 Audi a8 fl - Silver, Black alcantara seat/ S8 grill/side mirror, MFSW, Solar Sunroof, 17" Monoblocks (for that extra cushion of air), Rnsc, Bose.....great motorway cruiser....now gone to a new home 02 Final Edition S8 - Avus Silver, Extended Leather Pack III, Front & Rear Heated Seats, Servo, Blinds, Rear Seat Entairtainment with Playstation, Bose, Bi Xenons.....now gone to a new home 97 PF A8 4.2 quattro sport - Cashmere Grey, Servo, RNS E, Blinds, Bose, 20 Final Edition Alloys, LPG....sold sadly and will be missed 03 S4 V8 Saloon - Misano red, Manual, Milltek, Bose, Xenons, RNS E - Sold as of Feb 2012
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