Sorry for the double post but wanted to correct subject line.
>
> My 83.5 1.9 wbx does this too. At start it goes on fast idle, then
> into cyclic idle. eventually it settles down to a smooth idle.
> Would these symptoms fit your "cure"?
>
>
> On 17-Dec-07, at 8:41 PM, Automatic digest processor wrote:
>
>> On Monday, December 17, 2007, at 02:13  PM, Automatic digest
>> processor
>> wrote:
>>> Date:    Mon, 17 Dec 2007 15:29:54 -0500
>>> From:    AAG - Larry Word <word_aag@COMCAST.NET>
>>> Subject: 1985 Vanagon - New Year's resolution - AFM
>>>
>>> It's time to finally fix my "hunting idle" on my vanagon.....
>>>
>>> I drive this van daily but it's idle has been unstable - "hunts -
>>> with
>>> =
>>> peaks and lows" - for many years now...its idles like a old harley =
>>> motorcycle....
>>>
>>> Where do I start looking to fix this symptom?
>>
>> There are two easy-enough possibilities; one is idle set too high,
>> and
>> the other is a bad O2 sensor.
>>
>> In the first condition the idle raise up until about 1500 or so, then
>> cuts abruptly down, repeats.  Screwing the idle screw on the throttle
>> body in (clockwise until the idle is around 900 rpm will fix it.
>>
>> The second condition is caused by the computer hunting for the
>> correct
>> mixture because it's not receiving a good signal from the O2 sensor.
>> If it goes away by unplugging the sensor, you need a new one.
>> They do
>> wear out and/or can be damaged by a rich running condition or if you
>> overfill the oil.
>>
>> Hope this helps,
>> Gregory Smith
>> Olympia, WA
>> '84 Vanagon
>> '88 Vanagon
>> '87 Bertone X1/9 Corsa
>>
>