[s-cars] ISV Cleaning, was: Translation

[Toborg Michael (AC/ESC3-CC) *]

Yep, I got pretty much the same thing. Stopping at a light I will notice
the rpm dip down once in a while. My idle is pretty good otherwise too.
Not a problem, but is something I've noticed.
O2 sensor, plugs, fuel filter were done ~15k miles ago...car is stock

-Tobs  

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of Marc Gorelick
Sent: Thursday, March 16, 2006 4:01 PM
To: S-cars mailing list
Subject: Re: [s-cars] ISV Cleaning, was: Translation

Kent McLean wrote:

>Toborg Michael (AC/ESC3-CC) * wrote:
>  
>
>>Multi Function Temp Switch
>>Mass Air Flow (Sensor) 
>>Blow Off Valve
>>Idle Stabilization Valve.
>>
>>Carb cleaner? Also curious about cleaning the ISV.
>>    
>>
>
>http://www.audifans.com/twiki/bin/view/Audi/IsvCleaning
>
On a related note, perhaps someone can tell me if this is an ISV 
problem. Patient is a '93. Car idles great except for the problem below:

When decelerating on approach to a red light, I usually just pop the car

out of gear and hit the brakes. Often when I do this, the engine RPMs 
will coast down to the normal idle speed and then keep going, down to 
the vicinity of 500 RPMs or so. At this point, something realizes that 
the RPMs are too low and the engine speed rebounds well past the normal 
idle, up to as high as 2,000 RPMs.  After this the idle immediately 
returns to normal.

This occurs about 1/3 of the time when I am decelerating as I approach a

light. So far a bit of experimentation seems to suggest that if I stay 
off the brakes the problem doesn't occur.

Since the idle is rock-steady other times, so I wonder if this is ISV 
related or something else entirely. My assumption is that an ISV problem

would show itself at other times as well. Anyone seen a similar issue?

Thanks for any feedback,

Marc


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