s2 cutting out at idle and bad on fuel

[jchn_smith]

ok im new to s2's so new to the forums aswell so sorry if im asking in the wrong place or anything

iv had it a few weeks and its been a dream until last night when it started idling irraticaly
from500 to 1500 and ocasionaly cutting out also seems flat/ sputtery until 2500 tonight on the way home its been cutting out everytime i stop
cant see any obvious boost leaks or anything

its a aby coupe if that makes any difference

please help cheers john

[andyg plym]

idle stabalisation valve?

[UrS4boy]

N71 Idle Speed Stabilization Valve

Could be a vacuum/boost leak but you should start with checking and cleaning the N71 Idle Speed Stabilization valve (ISV). Some info is available here (note: AAN, ABY and ADU all use the same ISV):

http://forums.quattroworld.com/s4s6/msgs/21853.phtml

[jchn_smith]

cool thanks is brake and clutch cleaner ok to use for cleaning this will try this tomorrow and let yous know how i get on

cheers john

[UrS4boy]

cool thanks is brake and clutch cleaner ok to use for cleaning this will try this tomorrow and let yous know how i get on cheers john

Maybe but I would use to carburetor and injector cleaner instead.

[prj]

MAF, MAF connector or big air leak.

[jchn_smith]

Cleaned it out today and doesn't seem any better. Wasn't oily inside anyways. Will have a look at the maf tomorrow cheers john

[UrS4boy]

Cleaned it out today and doesn't seem any better. Wasn't oily inside anyways. Will have a look at the maf tomorrow cheers john

Bad news/good news: Bad news = that wasn't the cure; Good news = at least that has been eliminated as a potential problem and, oh yeah, you now have a clean ISV.

On to the MAF and maybe the throttle potentiometer (and vacuum leaks):

MAF (pins and their position and cleanliness to be exact):

http://forums.quattroworld.com/s4s6/msgs/20442.phtml

Throttle Potentiometer:

http://forums.quattroworld.com/s4s6/msgs/20405.phtml

[Rikki Kitto]

Great links by the way, been having very similar problems myself and I think I will be checking these two items out, cheers.