Re: erratic idling upon cold start

["Bill Collins" <photo@intrex.net>]

I'm fighting something like this on my '86 Jetta right now (except that it does it when hot too).  One thing to check is the temperature switch that tells the computer that the engine is warm enough for it to start looking at the oxygen sensor.  I think the location of the sensor has changed a bit over the years, but it should be on one of the coolant hose fittings at the head.  It has two wires connecting to it.  Check the switch with an ohm meter.  It should be closed if the engine is cold (less than about 75-80 degrees F) and open if warmer.

Its not the cold start valve, since that only operates while the starter is cranking.

Its a good idea to check for vacuum leaks too.

Bill

---------- Original Message ----------------------------------
From: EuroVWtek@aol.com
Date: Thu, 31 Aug 2000 00:51:01 EDT

>ATTN. LIST, my name is Tim and I am sort of new to the list, but for the past 
>several months I have been more or less of a passive observer to the list, 
>however I wanted to ask a question about my 85' 8v. It seems after sitting 
>overnight and becoming cold, my car will want to idle up and down from like 
>1000-1100 rpms down to almost a stall, and when I first head up my street, it 
>wants to hesitate going into 2nd gear. After the is just remotely warmed up, 
>it runs fine. I put injector o-rings in about a year ago, so I pretty much 
>can rule that out of the equation. My fuel filter and "tune up" parts are 
>new. Could I have an OXS prob? Cold start valve prob? HELP is appreciated. 
>THanks
>
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