'91 Coupe quattro erratic cold idle

[jlagnese at massed.net]

I only changed one of those in all of my vehicles. It may be though if it happens at operating temperature. 
----- Original Message -----

From: "Christopher Gharibo" <cgharibo at usa.net> 
To: 20v at lists.20v.org, quattro at audifans.com 
Sent: Sunday, September 17, 2017 11:13:55 AM 
Subject: Re: '91 Coupe quattro erratic cold idle 

If idle vacillates when engine warm as well, could this be the throttle potentiometer? 

On Sep 16, 2017, at 9:16 PM, jlagnese at massed.net wrote: 

Yes, this was a problem on a couple of my VWs. It was the one where the coolant hose goes into the engine at the top. If you unplug the sensor it may stop the problem. If so, that's it. 
----- Original Message ----- 
From: Christopher Gharibo <cgharibo at usa.net> 
To: quattro at audifans.com, 20v at lists.20v.org 
Sent: Sat, 16 Sep 2017 20:37:38 -0400 (EDT) 
Subject: '91 Coupe quattro erratic cold idle 

Which temperature sensor would this be? 

Do you mean the multifunction temperature sensor? 



Message: 3 
Date: Tue, 5 Sep 2017 23:29:20 -0400 (EDT) 
From: jlagnese at massed.net 
To: Christopher Gharibo <cgharibo at usa.net> 
Cc: 20v at lists.20v.org, quattro at audifans.com 
Subject: Re: '91 Coupe quattro erratic cold idle 
Message-ID: 
<2073571107.55234626.1504668560066.JavaMail.root at massed.net> 
Content-Type: text/plain; charset=utf-8 

A temperature sensor? 

----- Original Message ----- 

From: "Christopher Gharibo" <cgharibo at usa.net> 
To: 20v at lists.20v.org, quattro at audifans.com 
Sent: Tuesday, September 5, 2017 4:24:15 PM 
Subject: '91 Coupe quattro erratic cold idle 

My '91 CQ idle vacillates between 200-1000 when engine cold. If I release the accelerator when engine cold, the car may stall. Turning the AC on keeps the car from stalling. 

I cleaned and swapped the ISV without success. Any other thoughts? 

Thanks. 
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