'91 Coupe quattro erratic cold idle

[Christopher Gharibo]

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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