Scott, thanks. Good tips, all. I'm going to work on them tomorrow.

John

John Rodgers
Clayartist and Moldmaker
88'GL VW Bus Driver
Chelsea, AL
Http://www.moldhaus.com

On 10/9/2010 8:33 PM, Scott Daniel - Turbovans wrote:
> one other thing ...
> I always feel better with a fuel pressure gauge on the fuel system ..
> while I'm sorting through weirdness, or at least for a while if other
> common things are not being found out of whack.
> ----- Original Message ----- From: "John Rodgers" <inua@CHARTER.NET>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Saturday, October 09, 2010 3:56 PM
> Subject: It continues - Engine RPM Hunting 200-500 rpm
>
>
>>  I have been tinkering with my 91 Carat and have still not resolved the
>> hunting issue.
>>
>> On cold start-up I have to play with the pedal to keep it running - up
>> and down between 1000 and 2000 rpm. As it warms up, it begins to settle
>> down. Not as much footwork to keep it running. Eventually it will idle
>> smoothly around 1000 rpm. But if I try and accelerate the engine above
>> the 1000 rpm range - it goes into the hunt mode again. Around 2000 rpm
>> it will run relatively smoothly.
>>
>> The injectors have been serviced and run in another of my vans, so I
>> know they are good. All the hoses are good, and I carefully inspected
>> the vacuum lines just to be sure. The crankcase vent host is new.
>>
>> I disconnected the idle stabilizer valve after warm up, and restarted.
>> It was a little rough to start, but after start-up it smoothed out at
>> 1000 rpm like before, and still would not run properly between 1000 and
>> 2000 rpm.
>>
>> I have not disconnected the O2 Sensor yet.  O2 sensors have caused rough
>> running on my other vans, and smoothed out when disconnected, but this
>> is a little different.
>>
>> So apparently, this takes me to the throttle switch - I think. But this
>> engine has only 114,000 miles and is clean, so I'm suspicious about
>> whether it's the switch or not. Never tampered with the switch before,
>> so a little unsettled about working on that.
>>
>> Any  input on this would be appreciated.
>>
>> Thanks,
>>
>> John
>>
>> --
>> John Rodgers
>> Clayartist and Moldmaker
>> 88'GL VW Bus Driver
>> Chelsea, AL
>> Http://www.moldhaus.com
>
>
>