Replace the Cylinder Head Temp Sensor, they're cheep.  An old one,
which is a transducer, can fail after a lot of cycles, causing the
engine to run crappy, lack of power, etc.  I mean, we're talking a 30+
year old Vanagon :)

If it's a California Model, it might be due for a new O2 sensor as well.

Either one would cause the symptoms from my own personal experience as
a former 80 Vanagon California owner.
-- 
Jim Thompson
84 GL 1.9 "Gloria"
84 Westfalia 2.1 "Ole Putt"
72 411 Station Wagon "Pug"
75 914 1.8 "Nancy"
Full Timing Since March 1999
oldvolkshome@gmail.com
http://www.oldvolkshome.com
***********************************
On Fri, Feb 4, 2011 at 11:24 AM, Tabe Johnson
<greentabe-vanagon@yahoo.com> wrote:
> I got an email from a vanagon guy in trouble so I'm going to take a look as soon as I can reach him. �As I recall the FI is more or less the same in all the air cooled models, but I haven't touched an air cooled in many moons.
>
> Summary: �Starts fine cold, runs poorly when warm. �Without looking at it, it sounds like it's running rich when warm. �I'm thinking cold start valve? �temperature sensor?
>
> Thanks for ideas.
>
> tabe johnson/90MV
>
> *** email starts here ***
> <edited for brevity>
>
> ��� We decided to bring it to a shop in Calgary (Concept1) to get it looked at before we hit the Rocky Mountains!��� They tinkered with it for 4 days.� Checked the timing, set the idle and got it running pretty good.� They suggested that we get the Air flow meter replaced because it was on the fritz.
> ��� When we got to Lake Louise, the Van started to run the same. Idle very low, surges on the highway at high speeds.
>
> Installed a new AFM. �Considering replacing the throttle body.
>
> These are the things that I have replaced very, very recently.
> New Fuel filter (canister style), ignition coil, new cap, rotor, plugs, wires, battery, air filter,
> Air Flow Meter and ignition.
>
> �� Right now the van will start no problem, cold idle nice and happy, then when warm, chug, chug, chug and�stall.
>
> ***end of email***