engine management light

[JAMES]

my engine management light came on and has been switched off twice.it usually stays off for a couple of days before coming back on.
the computer says it is the evap emission control system,falt code is 16825.i have been told the emission recirculation valve may be sticking.
does anybody know what this code is,i am good with mechanics can i do anything myself. [img]images/graemlins/beerchug.gif[/img]

[TarmacTerrorist]

Hello James,

Had a similar thing on an old car of mine execpt it kept cutting out the engine when accererating away from lights or junctions when the light was on. It turned out to be a sticking EGR valve (Exhaust Gas Recycling valve). I might be completely wrong but from what I can remember this valve opens and closes according to engine revs to allow a certain amount of exhaust gas to re-enter the combustion chamber? The more revs on the engine the more it opens, if it's sticking it stays open when you come off the gas, when you come to accelerate again the valve being open more than it should be floods the engine with exhaust and kills it. Cure - new valve. Dont know if this is the same set up on the Audi.

[TarmacTerrorist]

Someone who knows more about the subject than me.

http://www.tr6web.com/Documents/tr6/egrvalve.html

http://www.visionengineer.com/mech/exha ... tion.shtml

[JAMES]

thanks,anybody know where to find this on the rs4.or what the code actually means.

[drjones]

My engine management light came on yesterday, stayed on until i started the car again and has not come on since! its in for a new diff on the 10th March they can have a look a what code it saved, i will let you know. [img]images/graemlins/thumbs.gif[/img]