engine dieing at idle BPV ISV Fuel pump? '91 200 20v

[SuffolkD at aol.com]

Gent(s):  I went one further and threw up several photos of ISV's 10 V vs 3B 
20V, location etc....
www.quattro123.com/ISV.htm
HTH - Scott by BOSTON
In a message dated 7/21/2004 10:30:12 AM Eastern Daylight Time, SuffolkD 
writes:

> Subj: Re: engine dieing at idle BPV ISV Fuel pump? '91 200 20v
> Date: 7/21/2004 10:30:12 AM Eastern Daylight Time
> From: <A HREF="mailto:SuffolkD">SuffolkD</A>
> To: <A HREF="mailto:200q20v at audifans.com">200q20v at audifans.com</A>, <A HREF="mailto:jercurry at comcast.net">jercurry at comcast.net</A>, <A HREF="mailto:MstrBlastr at Comcast.net">MstrBlastr at Comcast.net</A>
> Gents:
> While the BPV may also contribute to it, I've found (in my case) that the 
> ISV Idle Stabilization Valve is the reason. Its easy to figure out.  Towards 
> the firewall end of the motor at the top of the intake tract is the ISV.  
> Disconnect the connector and see if it continues to stall.
> Symptoms are stalling after first starting the engine:  having to use the 
> throttle to maintain idle.  It will only throw a code when it really 
> malfunctions:  Increase the throttle and sluggish acceleration follows.
> 
> You can take it out and test it (the solenoid inside) with a 9 Volt battery.
> Most people clean it with throttle body cleaner or carb cleaner.
> 
> I suspect the buzzing fuel pump is a separate issue, however if its 
> contributing to the stalling, your due to be stranded by the side of the road very 
> soon as the fuel pumps worn out.  I've seen them buzz from 3 months to 3 
> years...................
> Keep the tank full of fuel.
> 
> Some mentioned adding "mystery oil" (from the FLAPS stores) to the tank.  No 
> BTDT and I'm a bit skeptic.
>