[s-cars] Bucking Hell

[Tom Green]

I agree in general with the suggestions you have already received for  
most likely
causes of this problem, but I would not rule out leaks in the intake/ 
boost hoses.
You haven't given the list much to go on, though.  You need to do the  
diagnostics
for what DTC's are stored in the computer.  This may help is  
isolating the exact
problem.  This site provides all the information you need:

http://www.sjmautotechnik.com/trouble_shooting/ecuf20v.html#fcs4

Also contained on SJM's site is the answer to your question, "how do  
I test the
WGFV ?".  It's just an electrical test.  You will have to determine  
if there are
vacuum leaks in the hoses to the valve.

Tom

> Original message:
> Message: 7
> Date: Sat, 08 Apr 2006 19:50:10 +1200
> From: Sam Clarkson <anyone at edgetoedge.co.nz>
> Subject: [s-cars] Bucking Hell
> To: s-car-list at audifans.com
> Message-ID: <2017D844-AE7F-418A-B7B8-E757DD1F26BF at edgetoedge.co.nz>
> Content-Type: text/plain;	charset=US-ASCII;	delsp=yes;	format=flowed
>
> Hi
> My 93 S4 has developed an overboost cutout type bucking at only
> moderate boost(1.4 bar or so). I am assuming the WGFV is sticking,
> correct assumption? How do I test it and, no, I don't have a mate
> down the road with a spare S4 to swap with.
>
>
> Sam Clarkson
> Edge to Edge
> P.O. Box 27
> National Park 2653
> Ph 0800 800 SKI (754)
> http://www.edgetoedge.co.nz